/* ============================================================
   Tenco LMS – Design systém v2 | Modern & Premium
   ============================================================ */

:root {
  --primary:        #4338ca;
  --primary-dark:   #3730a3;
  --primary-light:  #6366f1;
  --primary-50:     #eef2ff;
  --primary-100:    #e0e7ff;
  --secondary:      #0ea5e9;
  --secondary-dark: #0284c7;
  --accent:         #f59e0b;
  --success:        #10b981;
  --danger:         #ef4444;
  --warning:        #f59e0b;
  --bg:             #ffffff;
  --bg-secondary:   #f8fafc;
  --bg-tertiary:    #f1f5f9;
  --bg-dark:        #0f172a;
  --border:         #e2e8f0;
  --border-strong:  #cbd5e1;
  --text:           #0f172a;
  --text-secondary: #334155;
  --text-muted:     #64748b;
  --text-light:     #94a3b8;
  --font:           'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:      'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm:      6px;
  --radius:         10px;
  --radius-lg:      16px;
  --radius-xl:      24px;
  --radius-full:    9999px;
  --shadow-xs:      0 1px 2px rgba(0,0,0,.05);
  --shadow-sm:      0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow:         0 4px 6px -1px rgba(0,0,0,.08), 0 2px 4px -2px rgba(0,0,0,.04);
  --shadow-md:      0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
  --shadow-lg:      0 20px 25px -5px rgba(0,0,0,.1), 0 8px 10px -6px rgba(0,0,0,.04);
  --shadow-xl:      0 25px 50px -12px rgba(0,0,0,.25);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition:      all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================ Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; }
body {
  font-family: var(--font);
  font-size: 16px; line-height: 1.6;
  color: var(--text); background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition-fast); }
a:hover { color: var(--primary-dark); }

/* ============================================================ Layout */
.container    { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 800px;  margin: 0 auto; padding: 0 24px; }
.container-lg { max-width: 1400px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) {
  .container, .container-sm, .container-lg { padding: 0 16px; }
}

/* ============================================================ Typografie */
h1,h2,h3,h4,h5,h6 { font-family: var(--font-heading, var(--font)); font-weight: var(--font-heading-weight, 700); line-height: 1.2; color: var(--text); letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }
p  { line-height: 1.7; }
.text-muted   { color: var(--text-muted); }
.text-center  { text-align: center; }

.section-label {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.73rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--primary); background: var(--primary-50);
  padding: 4px 12px; border-radius: var(--radius-full); margin-bottom: 16px;
}

/* ============================================================ Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; padding: 11px 22px;
  font-family: var(--font); font-size: 0.9rem; font-weight: 600;
  border: 2px solid transparent; border-radius: var(--radius);
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: var(--transition); line-height: 1.4;
}
.btn:hover        { transform: translateY(-1px); }
.btn:active       { transform: translateY(0); }
.btn:focus-visible{ outline: 2px solid var(--primary); outline-offset: 3px; }

.btn-primary  { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 2px 8px rgba(67,56,202,.25); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; box-shadow: 0 4px 16px rgba(67,56,202,.35); }
.btn-secondary { background: var(--secondary); color: #fff; border-color: var(--secondary); }
.btn-secondary:hover { background: var(--secondary-dark); border-color: var(--secondary-dark); color: #fff; }
.btn-outline  { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-outline-white { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.btn-outline-white:hover { background: rgba(255,255,255,.15); border-color: #fff; }
.btn-white    { background: #fff; color: var(--primary); border-color: #fff; box-shadow: var(--shadow); }
.btn-white:hover { background: var(--primary-50); color: var(--primary-dark); }
.btn-ghost    { background: transparent; color: var(--text-muted); border-color: transparent; }
.btn-ghost:hover { background: var(--bg-tertiary); color: var(--text); transform: none; }
.btn-success  { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #059669; color: #fff; }
.btn-danger   { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #dc2626; color: #fff; }

.btn-xs  { padding: 4px 10px;  font-size: 0.75rem; }
.btn-sm  { padding: 7px 14px;  font-size: 0.82rem; }
.btn-lg  { padding: 14px 28px; font-size: 1rem; }
.btn-xl  { padding: 18px 36px; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }

/* ============================================================ Forms */
.form-group  { margin-bottom: 20px; }
.form-label  { display: block; font-size: 0.875rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.form-label.required::after { content: ' *'; color: var(--danger); }
.form-control {
  width: 100%; padding: 10px 14px;
  font-family: var(--font); font-size: 0.9rem;
  color: var(--text); background: var(--bg);
  border: 1.5px solid var(--border); border-radius: var(--radius);
  outline: none; transition: var(--transition); line-height: 1.5;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(67,56,202,.1); }
.form-control::placeholder { color: var(--text-light); }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control {
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%2364748b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center; background-size: 20px; padding-right: 36px;
}
.form-hint  { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }
.form-error { font-size: 0.78rem; color: var(--danger); margin-top: 4px; }
.form-row   { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.checkbox-label { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 0.9rem; }
.checkbox-label input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }

/* ============================================================ Alerts & Flash */
.alert { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: var(--radius); font-size: 0.9rem; border: 1px solid transparent; margin-bottom: 16px; }
.alert-success { background: #f0fdf4; color: #14532d; border-color: #86efac; }
.alert-error   { background: #fef2f2; color: #7f1d1d; border-color: #fca5a5; }
.alert-info    { background: #eff6ff; color: #1e3a5f; border-color: #93c5fd; }
.alert-warning { background: #fffbeb; color: #78350f; border-color: #fde68a; }

.site-flash { padding: 12px 0; font-size: 0.9rem; font-weight: 500; }
.site-flash .container { display: flex; justify-content: space-between; align-items: center; }
.site-flash button { background: none; border: none; cursor: pointer; font-size: 1rem; opacity: 0.6; color: inherit; padding: 0 8px; }
.site-flash button:hover { opacity: 1; }
.flash-success { background: #f0fdf4; color: #14532d; }
.flash-error   { background: #fef2f2; color: #7f1d1d; }
.flash-info    { background: #eff6ff; color: #1e3a5f; }

/* ============================================================ Badges */
.badge          { display: inline-flex; align-items: center; gap: 3px; padding: 3px 10px; font-size: 0.72rem; font-weight: 700; border-radius: var(--radius-full); letter-spacing: 0.03em; text-transform: uppercase; }
.badge-default  { background: var(--bg-tertiary); color: var(--text-muted); }
.badge-primary  { background: var(--primary-100); color: var(--primary-dark); }
.badge-green    { background: #d1fae5; color: #065f46; }
.badge-yellow   { background: #fef3c7; color: #92400e; }
.badge-red      { background: #fee2e2; color: #991b1b; }
.badge-blue     { background: #dbeafe; color: #1e40af; }

/* ============================================================ Header */
.site-header {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  transition: box-shadow 0.2s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.site-header .container { max-width: var(--header-max-w, 1280px); }
.site-header.header-no-sticky { position: relative; }
.header-style-transparent { background: transparent !important; border-bottom-color: transparent !important; }
.header-style-transparent.scrolled { background: rgba(255,255,255,.97) !important; border-bottom-color: var(--border) !important; }
.header-style-left .main-nav { margin-right: auto; }
.header-style-centered .header-inner { flex-direction: column; height: auto; padding: 14px 0; gap: 10px; }
.header-style-centered .header-right { position: absolute; right: 0; top: 14px; }
/* Split: logo vlevo | nav opravdu na střed | auth vpravo */
.header-style-split .header-inner { display: grid; grid-template-columns: 1fr auto 1fr; }
.header-style-split .main-nav { flex: none; justify-content: center; }
.header-style-split .header-right { justify-self: end; display: flex; align-items: center; gap: 10px; }

.header-inner { display: flex; align-items: center; gap: 24px; height: var(--header-h, 68px); }

.site-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.2rem; font-weight: 800; color: var(--text);
  letter-spacing: -0.02em; white-space: nowrap; flex-shrink: 0;
}
.site-logo:hover { color: var(--primary); }
.logo-text { color: var(--primary); }

.main-nav { display: flex; align-items: center; gap: 2px; flex: 1; }
.mobile-nav-auth { display: none; }
.nav-item-wrap { position: relative; }
.nav-link {
  display: flex; align-items: center; gap: 4px;
  padding: 8px 14px;
  font-size: var(--nav-font-size, 0.875rem);
  font-weight: var(--nav-font-weight, 500);
  text-transform: var(--nav-text-transform, none);
  letter-spacing: var(--nav-letter-spacing, 0em);
  color: var(--nav-link-color, var(--text-secondary));
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  text-decoration: none;
  position: relative;
}
/* Hover: výchozí – barva */
.nav-link:hover    { color: var(--nav-hover-color, var(--primary)); }
.nav-link.active   { color: var(--primary); background: var(--primary-50); }

/* Hover efekty přes třídu na headeru */
.nav-hover-background .nav-link:hover  { background: var(--bg-secondary); color: var(--nav-hover-color, var(--primary)); }
.nav-hover-underline  .nav-link::after { content:''; position:absolute; bottom:4px; left:14px; right:14px; height:2px; background:var(--nav-hover-color, var(--primary)); transform:scaleX(0); transition:transform .2s; border-radius:2px; }
.nav-hover-underline  .nav-link:hover::after { transform:scaleX(1); }
.nav-hover-underline  .nav-link:hover  { color: var(--nav-hover-color, var(--primary)); }
.nav-hover-bold       .nav-link:hover  { font-weight: 700; color: var(--nav-hover-color, var(--primary)); }
.nav-hover-pill       .nav-link:hover  { background: var(--nav-hover-color, var(--primary)); color: #fff; border-radius: 20px; }
.dropdown-arrow    { font-size: 0.65rem; opacity: 0.5; transition: transform 0.2s; }
.nav-item-wrap:hover .dropdown-arrow { opacity: 1; transform: rotate(180deg); }

/* Dropdown – hlavní menu */
.dropdown-menu {
  display: none;
  position: absolute; top: calc(100% + 6px); left: 0;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  min-width: 200px; z-index: 200; padding: 6px;
  animation: fadeInDown .15s ease;
}
/* Neviditelný most přes gap – zachová :hover při přejíždění do dropdownu */
.dropdown-menu::before {
  content: ''; position: absolute; top: -10px; left: -6px; right: -6px; height: 10px;
}
.nav-item-wrap:hover .dropdown-menu { display: block; }
.dropdown-item {
  display: block; padding: 8px 12px; font-size: 0.875rem;
  color: var(--text-secondary); border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}
.dropdown-item:hover { background: var(--bg-tertiary); color: var(--primary); }

.header-right { display: flex; align-items: center; gap: 8px; margin-left: auto; }

/* ── Language switcher – rozbalovací ──────────────────── */
.lang-switcher-menu { position: relative; }
.lang-current {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 11px; background: none;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: 0.8rem; font-weight: 600; color: var(--text-secondary);
  cursor: pointer; transition: var(--transition-fast); white-space: nowrap;
  font-family: var(--font);
}
.lang-current:hover { border-color: var(--primary); color: var(--primary); }
.lang-flag { display: inline-flex; align-items: center; }
.flag-svg { width: 20px; height: 14px; object-fit: cover; border-radius: 2px; flex-shrink: 0; display: inline-block; vertical-align: middle; }
.lang-name { max-width: 90px; overflow: hidden; text-overflow: ellipsis; }
.lang-arrow { font-size: 0.55rem; opacity: 0.55; transition: transform .2s; margin-left: 2px; }
.lang-switcher-menu:hover .lang-arrow { transform: rotate(180deg); opacity: 1; }
.lang-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 6px);
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  min-width: 170px; z-index: 200; padding: 6px;
  animation: fadeInDown .15s ease;
}
.lang-dropdown::before {
  content: ''; position: absolute; top: -10px; left: -6px; right: -6px; height: 10px;
}
.lang-switcher-menu:hover .lang-dropdown { display: block; }
.lang-option {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; font-size: 0.875rem; color: var(--text-secondary);
  border-radius: var(--radius-sm); transition: var(--transition-fast);
}
.lang-option:hover { background: var(--bg-tertiary); color: var(--primary); }
.lang-option.active { color: var(--primary); font-weight: 600; background: var(--primary-50); }

/* ── User menu ────────────────────────────────────────── */
.user-menu { position: relative; }
.user-menu-toggle { display: flex; align-items: center; gap: 8px; cursor: pointer; background: none; border: none; padding: 0; }
.user-avatar-sm {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 0.82rem; font-weight: 700; flex-shrink: 0;
  box-shadow: 0 0 0 2px var(--primary-50);
}
.user-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 6px);
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  min-width: 180px; z-index: 200; padding: 6px;
  animation: fadeInDown .15s ease;
}
.user-dropdown::before {
  content: ''; position: absolute; top: -10px; left: -6px; right: -6px; height: 10px;
}
.user-menu:hover .user-dropdown { display: block; }
.user-dropdown a {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; color: var(--text-secondary); font-size: 0.875rem;
  border-radius: var(--radius-sm); transition: var(--transition-fast);
}
.user-dropdown a:hover { background: var(--bg-tertiary); color: var(--primary); }

.mobile-menu-toggle {
  display: none; background: none; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); width: 38px; height: 38px; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px; flex-shrink: 0;
}
.mobile-menu-toggle span { display: block; width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

@media (max-width: 768px) {
  .mobile-menu-toggle { display: flex; }

  /* Header layout — logo vlevo, pravá část vpravo */
  .header-inner { gap: 8px; }
  .site-logo { margin-right: auto; }
  .site-logo img { min-height: 36px; }
  .header-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; margin-left: 0; }

  /* Split styl — na mobilu 2 sloupce místo 3 */
  .header-style-split .header-inner { display: flex; }
  .header-style-split .main-nav { flex: none; }
  .header-style-split .header-right { justify-self: unset; margin-left: 0; }

  /* Skrýt auth tlačítka z headeru — jsou v mobilním menu */
  .header-auth { display: none; }

  /* Mobilní navigace — fixed panel pod headerem */
  .main-nav {
    display: none;
    position: fixed;
    top: var(--header-h, 68px); left: 0; right: 0;
    height: calc(100vh - var(--header-h, 68px));
    background: var(--bg);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 12px 16px 32px;
    border-top: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 95;
    -webkit-overflow-scrolling: touch;
  }
  .main-nav.open { display: flex; }
  .nav-item-wrap { width: 100%; flex-shrink: 0; }
  .nav-link {
    display: block;
    padding: 14px 16px;
    border-radius: var(--radius);
    font-size: 1rem;
    width: 100%;
    border-bottom: 1px solid var(--border);
  }
  .nav-item-wrap:last-child .nav-link { border-bottom: none; }
  .dropdown-menu { display: none !important; }
  .lang-name { display: none; }
  .lang-dropdown { right: 0; left: auto; }

  /* Auth tlačítka v mobilním menu */
  .mobile-nav-auth {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 16px;
    margin-top: 8px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
  }
  .btn-mobile-auth {
    width: 100%;
    justify-content: center;
    padding: 12px 16px;
    font-size: 1rem;
  }
}

/* ============================================================ Main & Footer */
.site-main { min-height: calc(100vh - var(--header-h, 68px) - 340px); }

/* Newsletter bar */
.newsletter-bar-outer {
  position: relative;
  z-index: 20;
  margin-bottom: -72px;
}
.newsletter-bar {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  box-shadow: 0 12px 48px rgba(0,0,0,.14);
  padding: 40px 48px;
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}
.newsletter-bar-deco {
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: auto; max-height: 100%;
  pointer-events: none; user-select: none;
  object-fit: contain; object-position: right center;
  opacity: .18;
}
.newsletter-bar-text { flex: 1; min-width: 220px; position: relative; z-index: 1; }
.newsletter-bar-title { margin: 0 0 4px; font-size: 1.4rem; font-weight: 700; line-height: 1.2; }
.newsletter-bar-subtitle { margin: 0; font-size: .9rem; opacity: .75; }
.newsletter-bar-form { display: flex; gap: 10px; flex-wrap: wrap; flex: 1; min-width: 260px; position: relative; z-index: 1; }
.newsletter-bar-input {
  flex: 1; min-width: 180px;
  padding: 12px 16px; border-radius: 10px;
  border: 1.5px solid rgba(0,0,0,.12);
  background: #fff !important;
  color: #1e293b !important;
  font-size: .95rem; outline: none; transition: border-color .2s;
}
.newsletter-bar-input:focus { border-color: var(--primary); }
.newsletter-bar-input::placeholder { color: #94a3b8 !important; opacity: 1; }
.newsletter-bar-btn { white-space: nowrap; padding: 12px 24px; }
.newsletter-bar-msg { flex: 1 0 100%; margin: 0; font-size: .9rem; font-weight: 500; }
@media (max-width: 640px) {
  .newsletter-bar { padding: 28px 20px; gap: 20px; }
  .newsletter-bar-outer { margin-bottom: -56px; }
  .newsletter-bar-deco { opacity: .1; }
}

.site-footer {
  background: var(--bg-dark); color: #94a3b8;
  padding: 80px 0 40px; margin-top: 0;
}
.site-footer.has-newsletter-bar { padding-top: calc(72px + 56px); }
@media (max-width: 640px) {
  .site-footer.has-newsletter-bar { padding-top: calc(56px + 48px); }
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 64px; margin-bottom: 56px;
}
@media (max-width: 1024px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; } }
@media (max-width: 640px)  { .footer-grid { grid-template-columns: 1fr; gap: 32px; } }

.footer-brand .footer-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.2rem; font-weight: 800; color: #fff;
  margin-bottom: 16px; letter-spacing: -0.02em;
}
.footer-desc { font-size: 0.875rem; line-height: 1.7; margin-bottom: 24px; max-width: 280px; }
.footer-nav h4 {
  font-size: 0.73rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: #fff; margin-bottom: 16px;
}
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav a { color: #94a3b8; font-size: 0.875rem; transition: var(--transition-fast); }
.footer-nav a:hover { color: #fff; }

.footer-contact h4 {
  font-size: 0.73rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: #fff; margin-bottom: 16px;
}
.footer-contact { font-size: 0.875rem; }
.footer-contact div { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; color: #94a3b8; }
.footer-contact a { color: #94a3b8; }
.footer-contact a:hover { color: #fff; }

.social-links { display: flex; gap: 8px; }
.social-link {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; background: rgba(255,255,255,.1);
  border-radius: var(--radius-sm); color: #94a3b8; font-size: 0.73rem; font-weight: 700;
  transition: var(--transition-fast);
}
.social-link:hover { background: var(--primary); color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 24px; display: flex; justify-content: space-between; align-items: center;
  font-size: 0.82rem; flex-wrap: wrap; gap: 12px;
}
.footer-bottom a { color: #94a3b8; }
.footer-bottom a:hover { color: #fff; }

/* ============================================================ Hero */
.hero-section {
  position: relative; padding: 100px 0 80px;
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
  color: #fff; overflow: hidden;
}
.hero-section::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99,102,241,.25) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(139,92,246,.2) 0%, transparent 50%);
}
.hero-section::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 1px; background: linear-gradient(90deg, transparent, rgba(99,102,241,.5), transparent);
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 720px; margin: 0 auto; }
.hero-label {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(99,102,241,.2); border: 1px solid rgba(99,102,241,.3);
  border-radius: var(--radius-full); padding: 6px 16px;
  font-size: 0.73rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: #a5b4fc; margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 900; line-height: 1.1;
  letter-spacing: -0.02em; margin-bottom: 24px;
  background: linear-gradient(135deg, #fff 0%, #c7d2fe 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.15rem); color: #c7d2fe; line-height: 1.7;
  margin-bottom: 40px; max-width: 540px; margin-left: auto; margin-right: auto;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  margin-top: 64px; padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,.1);
  display: flex; gap: 64px; justify-content: center; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-value { font-size: 2rem; font-weight: 800; color: #fff; letter-spacing: -0.02em; }
.hero-stat-label { font-size: 0.82rem; color: #a5b4fc; margin-top: 2px; }

/* ============================================================ Sections */
.section    { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.section-lg { padding: 120px 0; }
.section-alt { background: var(--bg-secondary); }

.section-header { margin-bottom: 48px; }
.section-header.center { text-align: center; }
.section-title { margin-bottom: 16px; }
.section-desc { font-size: 1.05rem; color: var(--text-muted); line-height: 1.7; max-width: 600px; }
.section-header.center .section-desc { margin: 0 auto; }
.section-actions { display: flex; align-items: center; justify-content: space-between; margin-bottom: 32px; }
.see-all { color: var(--primary); font-weight: 600; font-size: 0.875rem; display: inline-flex; align-items: center; gap: 4px; }
.see-all:hover { gap: 8px; }

/* ============================================================ Course cards */
.courses-section { padding: 80px 0; }
.courses-page    { padding: 48px 0; }
.courses-grid    { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }

.course-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); overflow: hidden; display: flex; flex-direction: column;
  transition: var(--transition);
}
.course-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary-100); }

.course-card-image {
  height: 180px; background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  overflow: hidden; position: relative;
}
.course-card-image img { width: 100%; height: 100%; object-fit: cover; }

.course-card-body   { padding: 20px; flex: 1; }
.course-meta        { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.course-title       { font-size: 1.05rem; font-weight: 700; margin: 0 0 8px; line-height: 1.3; }
.course-title a     { color: var(--text); }
.course-title a:hover { color: var(--primary); }
.course-desc        { font-size: 0.875rem; color: var(--text-muted); margin: 0 0 12px; line-height: 1.6; }
.course-author      { font-size: 0.8rem; color: var(--text-muted); }
.course-card-footer { padding: 16px 20px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.course-duration    { font-size: 0.8rem; color: var(--text-muted); }
.course-free  { background: #d1fae5; color: #065f46; padding: 3px 10px; border-radius: var(--radius-full); font-size: 0.73rem; font-weight: 700; }
.course-price { background: #fef3c7; color: #92400e; padding: 3px 10px; border-radius: var(--radius-full); font-size: 0.73rem; font-weight: 700; }

.course-difficulty    { padding: 3px 10px; border-radius: var(--radius-full); font-size: 0.72rem; font-weight: 700; }
.difficulty-beginner     { background: #d1fae5; color: #065f46; }
.difficulty-intermediate { background: #dbeafe; color: #1e40af; }
.difficulty-advanced     { background: #fef3c7; color: #92400e; }
.difficulty-expert       { background: #fce7f3; color: #831843; }

/* ============================================================ Course detail */
/* ── Course Detail Hero ────────────────────────────────────────────── */
.course-detail-hero .page-hero-title { font-size: clamp(1.6rem, 3.5vw, 2.4rem); margin-bottom: 10px; }
.course-hero-desc {
    font-size: 1.05rem; color: rgba(255,255,255,.82); max-width: 640px;
    margin: 0 0 18px; line-height: 1.6;
}
.course-detail-hero .page-hero-content { padding: 40px 0 40px; }
.course-hero-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }
.course-hero-badge {
    display: inline-flex; align-items: center;
    background: rgba(255,255,255,.18); color: #fff;
    padding: 4px 12px; border-radius: var(--radius-full);
    font-size: .78rem; font-weight: 600; backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,.25);
}
.course-hero-badge--muted { background: rgba(255,255,255,.1); font-weight: 500; }

/* ── Course Tabs ───────────────────────────────────────────────────── */
.course-tabs {
    display: flex; gap: 0; border-bottom: 2px solid var(--border);
    margin-bottom: 28px;
}
.course-tab {
    background: none; border: none; cursor: pointer;
    padding: 12px 24px; font-size: .95rem; font-weight: 600;
    color: var(--text-muted); border-bottom: 2px solid transparent;
    margin-bottom: -2px; transition: color .15s, border-color .15s;
}
.course-tab:hover { color: var(--primary); }
.course-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.course-tab-panel { display: none; }
.course-tab-panel.active { display: block; }

/* ── Course Page layout ────────────────────────────────────────────── */
.course-page   { padding: 0 0 64px; }
.course-layout { display: grid; grid-template-columns: 1fr 400px; gap: 48px; align-items: start; }
@media (max-width: 960px) {
    .course-layout { grid-template-columns: 1fr; gap: 32px; }
    .course-sidebar { order: -1; margin-top: 0 !important; }
}

.course-main { padding-top: 40px; }
@media (max-width: 960px) { .course-main { padding-top: 0; } }

.course-breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 16px; }
.course-breadcrumb a { color: var(--primary); }
.course-meta-row  { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 16px; font-size: 0.875rem; align-items: center; color: var(--text-muted); }

/* ── CTA sidebar card ──────────────────────────────────────────────── */
.cta-price-row { margin-bottom: 16px; }
.cta-price-amount {
    font-size: 2rem; font-weight: 900; color: var(--text);
    letter-spacing: -0.02em; line-height: 1;
}
.cta-price-free {
    font-size: 1.5rem; font-weight: 800; color: #059669;
}
.course-includes { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.course-includes-item { display: flex; align-items: center; gap: 10px; font-size: .875rem; color: var(--text-muted); }
.course-includes-icon { font-size: 1rem; }
.course-learn-box { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; margin: 24px 0; }
.course-learn-box h3 { margin-bottom: 16px; font-size: 1rem; }
.learn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.learn-item { display: flex; align-items: flex-start; gap: 8px; font-size: 0.875rem; }
.learn-item::before { content: '✓'; color: var(--success); font-weight: 700; flex-shrink: 0; }
@media (max-width: 600px) { .learn-grid { grid-template-columns: 1fr; } }

.module-section { margin: 20px 0; }
.module-header { background: var(--bg-secondary); border: 1px solid var(--border); padding: 12px 16px; border-radius: var(--radius); margin-bottom: 8px; }
.module-header h3 { margin: 0; font-size: 0.95rem; }
.lessons-list { list-style: none; }
.lesson-item { display: flex; align-items: center; gap: 12px; padding: 10px 16px; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 6px; transition: var(--transition-fast); }
.lesson-item:hover { border-color: var(--primary); background: var(--primary-50); }
.lesson-item.completed { background: #f0fdf4; border-color: #86efac; }
.lesson-icon { font-size: 1rem; }
.lesson-info { flex: 1; }
.lesson-info a  { color: var(--text); font-size: 0.9rem; font-weight: 500; }
.lesson-info a:hover { color: var(--primary); }
.lesson-locked  { color: var(--text-muted); font-size: 0.875rem; }
.lesson-lock-icon { color: var(--text-light); }
.lesson-free    { font-size: 0.72rem; }
.free-badge { background: #d1fae5; color: #065f46; padding: 1px 6px; border-radius: var(--radius-full); font-size: 0.7rem; font-weight: 700; }

.course-sidebar {
    margin-top: -80px;
    position: relative;
    z-index: 10;
}
.course-cta-card {
    background: var(--bg);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    box-shadow: 0 24px 64px rgba(0,0,0,.22), 0 4px 16px rgba(0,0,0,.1);
}
.course-attachment-card {
    margin-top: 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 20px 22px;
    box-shadow: 0 2px 8px rgba(0,0,0,.06);
}
.course-attachment-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 12px;
}
.course-price-big { font-size: 2.25rem; font-weight: 900; color: var(--text); margin-bottom: 16px; letter-spacing: -0.02em; }
.course-includes  { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); }
.course-includes div { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--text-muted); margin-bottom: 8px; }
.enrollment-status { margin-bottom: 16px; }
.progress-bar { height: 6px; background: var(--bg-tertiary); border-radius: var(--radius-full); overflow: hidden; margin: 8px 0; }
.progress-fill { height: 100%; background: var(--success); border-radius: var(--radius-full); transition: width .3s ease; }
.progress-label { font-size: 0.82rem; color: var(--text-muted); }

/* ============================================================ Quiz player (FE) */
.quiz-player {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 32px; margin: 24px 0;
}
.quiz-progress-bar {
    height: 6px; background: var(--border); border-radius: var(--radius-full);
    margin-bottom: 16px; overflow: hidden;
}
.quiz-progress-fill {
    height: 100%; background: var(--primary);
    border-radius: var(--radius-full); transition: width .4s ease;
}
.quiz-step-counter {
    font-size: .8rem; font-weight: 600; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: .06em; margin-bottom: 20px;
}
.quiz-question-slide { display: none; }
.quiz-question-slide.active { display: block; }
.quiz-question-text {
    font-size: 1.15rem; font-weight: 700; margin: 0 0 20px; line-height: 1.45;
}
.quiz-answers { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.quiz-answer-option {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 18px; border: 2px solid var(--border);
    border-radius: var(--radius-lg); cursor: pointer;
    transition: border-color .15s, background .15s;
}
.quiz-answer-option:hover { border-color: var(--primary); background: var(--primary-50); }
.quiz-answer-option input[type=radio] { display: none; }
.quiz-answer-option:has(input:checked) { border-color: var(--primary); background: var(--primary-50); }
.quiz-answer-option.correct { border-color: #22c55e; background: #f0fdf4; }
.quiz-answer-option.wrong   { border-color: #ef4444; background: #fef2f2; }
.quiz-answer-label { font-size: .95rem; line-height: 1.4; }
.quiz-feedback {
    font-weight: 700; font-size: .95rem; padding: 10px 16px;
    border-radius: var(--radius); margin-bottom: 14px;
}
.quiz-feedback.correct { background: #f0fdf4; color: #15803d; }
.quiz-feedback.wrong   { background: #fef2f2; color: #dc2626; }
.quiz-explanation {
    font-size: .875rem; color: var(--text-muted); background: var(--surface);
    border-left: 3px solid var(--primary); padding: 10px 14px;
    border-radius: 0 var(--radius) var(--radius) 0; margin-bottom: 14px;
}
.quiz-controls { display: flex; gap: 10px; margin-top: 8px; }
.quiz-results { text-align: center; padding: 16px 0; }
.quiz-score-pct { font-size: 3rem; font-weight: 900; color: var(--primary); line-height: 1; }
.quiz-score-detail { font-size: 1rem; color: var(--text-muted); margin: 8px 0 4px; }
.quiz-score-msg { font-size: 1.1rem; font-weight: 600; margin-bottom: 20px; }

/* ── Matching ─────────────────────────────────────────────────── */
.quiz-matching { display: flex; flex-direction: column; gap: 10px; margin: 16px 0; }
.quiz-match-row { display: flex; align-items: center; gap: 12px; }

.qm-left {
    flex: 1;
    padding: 10px 14px;
    background: var(--bg-secondary, #f8fafc);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.92rem;
    line-height: 1.4;
}
.qm-arrow { color: var(--text-muted, #94a3b8); font-size: 1.1rem; flex-shrink: 0; }

/* Custom dropdown */
.qm-dropdown { flex: 1.1; position: relative; }
.qm-trigger {
    display: flex; align-items: center; justify-content: space-between; gap: 8px;
    padding: 10px 14px;
    border: 2px dashed var(--border, #e2e8f0);
    border-radius: 10px;
    cursor: pointer;
    background: var(--bg-primary, #fff);
    transition: border-color .18s, background .18s, box-shadow .18s;
    user-select: none;
}
.qm-trigger:hover { border-color: var(--primary, #6366f1); box-shadow: 0 0 0 3px rgba(99,102,241,.08); }
.qm-trigger-text { font-size: 0.88rem; color: var(--text-muted, #94a3b8); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.qm-chevron { flex-shrink: 0; color: var(--text-muted, #94a3b8); transition: transform .2s; }
.qm-dropdown.qm-open .qm-chevron { transform: rotate(180deg); }

/* Has a value selected */
.qm-dropdown.qm-has-value .qm-trigger {
    border-style: solid;
    border-color: var(--primary, #6366f1);
    background: color-mix(in srgb, var(--primary, #6366f1) 6%, white);
}
.qm-dropdown.qm-has-value .qm-trigger-text { color: var(--primary, #6366f1); font-weight: 600; }
.qm-dropdown.qm-has-value .qm-chevron { color: var(--primary, #6366f1); }

/* Dropdown panel */
.qm-panel {
    position: absolute; top: calc(100% + 5px); left: 0; right: 0; z-index: 200;
    background: var(--bg-primary, #fff);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 12px;
    box-shadow: 0 8px 28px rgba(0,0,0,.12), 0 2px 8px rgba(0,0,0,.06);
    overflow: hidden;
    display: none;
    animation: qmFadeIn .15s ease;
}
.qm-dropdown.qm-open .qm-panel { display: block; }
@keyframes qmFadeIn { from { opacity:0; transform:translateY(-4px); } to { opacity:1; transform:none; } }

.qm-option {
    padding: 10px 14px;
    cursor: pointer;
    font-size: 0.88rem;
    color: var(--text-primary, #1e293b);
    transition: background .12s;
    border-bottom: 1px solid var(--border, #e2e8f0);
}
.qm-option:last-child { border-bottom: none; }
.qm-option:hover { background: var(--bg-secondary, #f8fafc); }
.qm-option.qm-selected {
    background: color-mix(in srgb, var(--primary, #6366f1) 8%, white);
    color: var(--primary, #6366f1);
    font-weight: 600;
}

/* After answer evaluation */
.qm-dropdown.qm-locked .qm-trigger { cursor: default; pointer-events: none; }
.qm-dropdown.qm-correct .qm-trigger {
    border-style: solid; border-color: #22c55e;
    background: #f0fdf4;
}
.qm-dropdown.qm-correct .qm-trigger-text { color: #16a34a; font-weight: 600; }
.qm-dropdown.qm-correct .qm-chevron { color: #16a34a; }
.qm-dropdown.qm-wrong .qm-trigger {
    border-style: solid; border-color: #ef4444;
    background: #fef2f2;
}
.qm-dropdown.qm-wrong .qm-trigger-text { color: #dc2626; font-weight: 600; }
.qm-dropdown.qm-wrong .qm-chevron { color: #dc2626; }

/* ── Short answer / Numerical ────────────────────────────────── */
.quiz-shortanswer, .quiz-numerical { margin: 12px 0; }
.quiz-text-input { font-size: 1rem; }

/* ── Essay ───────────────────────────────────────────────────── */
.quiz-essay { margin: 12px 0; }
.quiz-essay-input { resize: vertical; font-size: 0.95rem; }
.quiz-essay-note { font-size: 0.8rem; color: var(--text-muted); margin-top: 6px; }
.quiz-feedback.essay { background: #eff6ff; color: #1d4ed8; border-color: #bfdbfe; }

/* ── Cloze ───────────────────────────────────────────────────── */
.quiz-question-text .quiz-cloze-input {
    display: inline-block;
    width: 120px;
    padding: 2px 6px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: inherit;
    vertical-align: baseline;
    margin: 0 3px;
}
.quiz-question-text .quiz-cloze-input:focus { outline: none; border-color: var(--primary); }

/* ── Multiple choice ─────────────────────────────────────────── */
.quiz-answers-multi { flex-direction: column; }

@keyframes shake {
    0%,100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}
.shake { animation: shake .4s ease; }

/* ============================================================ Lekce */
.lesson-page   { padding: 0; }
.lesson-layout { display: grid; grid-template-columns: 300px 1fr; min-height: calc(100vh - 68px); }
@media (max-width: 900px) { .lesson-layout { grid-template-columns: 1fr; } .lesson-sidebar { display: none; } }

.lesson-sidebar { background: var(--bg-secondary); border-right: 1px solid var(--border); overflow-y: auto; position: sticky; top: 68px; height: calc(100vh - 68px); }
.lesson-sidebar-header  { padding: 16px; border-bottom: 1px solid var(--border); }
.lesson-sidebar-content { padding: 8px 0; }
.back-link { display: inline-flex; align-items: center; gap: 4px; color: var(--text-muted); font-size: 0.82rem; }
.back-link:hover { color: var(--primary); }
.sidebar-module { margin-bottom: 4px; }
.sidebar-module-title { padding: 10px 16px; font-size: 0.72rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.07em; display: block; }
.sidebar-lessons { list-style: none; }
.sidebar-lesson-link { display: flex; align-items: center; gap: 8px; padding: 8px 16px; font-size: 0.82rem; color: var(--text-secondary); border-radius: var(--radius-sm); transition: var(--transition-fast); }
.sidebar-lesson-link:hover { background: var(--bg-tertiary); color: var(--primary); }
.sidebar-lessons li.current .sidebar-lesson-link { background: var(--primary-50); color: var(--primary); font-weight: 600; }
.sidebar-lesson-link.done   { color: var(--success); }
.sidebar-lesson-link.locked { color: var(--text-light); cursor: not-allowed; }
.lesson-status-icon { font-size: 0.82rem; }

.lesson-main         { padding: 48px 48px 0; width: 100%; display: flex; flex-direction: column; min-height: calc(100vh - 68px); }
.lesson-content-wrap { flex: 1; padding-bottom: 20px; }

/* TTS Player */
.tts-player {
    display: flex;
    align-items: center;
    gap: 14px;
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-lg);
    padding: 12px 18px;
    margin-bottom: 28px;
}
.tts-player-icon { font-size: 1.4rem; flex-shrink: 0; }
.tts-player-controls { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; }
.tts-player-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; flex-wrap: wrap; }
.tts-btn {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 36px; border-radius: 50%;
    border: none; cursor: pointer;
    background: #2563eb; color: #fff;
    transition: background .15s, transform .1s;
    flex-shrink: 0;
}
.tts-btn:hover:not(:disabled) { background: #1d4ed8; transform: scale(1.08); }
.tts-btn:disabled { background: #cbd5e1; cursor: not-allowed; }
.tts-info { display: flex; flex-direction: column; min-width: 0; }
.tts-label { font-size: .78rem; font-weight: 600; color: #1e40af; }
.tts-status { font-size: .72rem; color: #64748b; min-height: 1em; }
.tts-speed-label { font-size: .75rem; color: #64748b; white-space: nowrap; }
.tts-speed-select {
    font-size: .8rem; padding: 4px 8px; border-radius: 6px;
    border: 1px solid #bfdbfe; background: #fff; cursor: pointer;
    color: var(--text);
}
@media (max-width: 640px) {
    .tts-player { flex-wrap: wrap; gap: 10px; }
    .tts-player-right { width: 100%; }
}

.lesson-header  { margin-bottom: 32px; }
.lesson-title   { font-size: 1.75rem; font-weight: 800; margin-bottom: 8px; }
.lesson-desc    { color: var(--text-muted); margin-bottom: 12px; }
.lesson-type-badge { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; background: var(--bg-tertiary); border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 600; color: var(--text-muted); }
.lesson-content { line-height: 1.85; font-size: 1rem; }

.lesson-content img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: .5rem 1.5rem !important;
    border-radius: 6px;
}

/* Obrázky uvnitř ld-* karet nesmí přetéct přes podbarvení */
.ld-keypoints img,
.ld-questions img,
.ld-checklist img,
.ld-callout img,
.ld-highlight img {
    max-width: 100%;
    margin: .75rem 0 0;
    border-radius: 4px;
}

/* ── Lesson headings ─────────────────────────────────────────────────── */
.lesson-content h1,
.lesson-content h2,
.lesson-content h3,
.lesson-content h4 {
    line-height: 1.3;
    letter-spacing: -0.015em;
    color: var(--text, #0f172a);
}

/* H2 — hlavní sekce: výrazný levý pruh + jemný gradient tint */
.lesson-content h2 {
    font-size: 1.2rem;
    font-weight: 800;
    margin: 2.75rem 0 1rem;
    padding: 14px 18px 14px 20px;
    background: linear-gradient(100deg, rgba(99,102,241,.07) 0%, transparent 65%);
    border-left: 4px solid var(--primary, #6366f1);
    border-radius: 0 10px 10px 0;
}

/* H3 — podsekce: bold s barevnou tečkou vpravo a gradientní linkou */
.lesson-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 2.25rem 0 0.75rem;
    padding-bottom: 10px;
    position: relative;
}
.lesson-content h3::after {
    content: '';
    position: absolute;
    left: 0; bottom: 0;
    width: 52px; height: 3px;
    background: linear-gradient(90deg, var(--primary, #6366f1) 0%, transparent 100%);
    border-radius: 99px;
}

/* H4 — label/nadpisek: uppercase s primary barvou */
.lesson-content h4 {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary, #6366f1);
    margin: 1.75rem 0 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.video-wrapper { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: var(--radius-lg); margin-bottom: 24px; box-shadow: var(--shadow-lg); }
.video-wrapper iframe, .video-wrapper video { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.video-native { width: 100%; border-radius: var(--radius-lg); }
.video-figure { margin: 0 auto; }
.video-size-small  { max-width: 480px; }
.video-size-normal { max-width: 720px; }
.video-size-large  { max-width: 960px; }
.video-size-full   { max-width: 100%; }
/* Soubory ke stažení */
.lesson-files-panel { float: right; width: 320px; margin: 0 0 28px 36px; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 20px; }
.lesson-files-title { font-size: .85rem; font-weight: 700; margin: 0 0 14px; color: var(--text-primary); }
.lesson-files-list  { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.lesson-file-item   { display: flex; align-items: center; gap: 10px; }
.lesson-file-item-icon { font-size: 1.25rem; flex-shrink: 0; }
.lesson-file-item-info { flex: 1; min-width: 0; }
.lesson-file-item-name { display: block; font-size: .85rem; font-weight: 500; word-break: break-word; line-height: 1.3; }
.lesson-file-item-size { display: block; font-size: .75rem; color: var(--text-muted); margin-top: 2px; }
@media (max-width: 700px) { .lesson-files-panel { float: none; width: 100%; margin: 0 0 24px; } }

.lesson-controls { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); }
.lesson-nav { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.lesson-done-badge { display: inline-flex; align-items: center; gap: 8px; color: var(--success); font-weight: 600; background: #f0fdf4; padding: 8px 16px; border-radius: var(--radius); }

/* ============================================================ Auth */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: 50vh; padding: 48px 24px; background: var(--bg-secondary); }
.auth-container { width: 100%; max-width: 440px; }
.auth-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 40px; box-shadow: var(--shadow-md); }
.auth-header { text-align: center; margin-bottom: 32px; }
.auth-header h1 { font-size: 1.75rem; font-weight: 800; margin-bottom: 8px; }
.auth-header p  { color: var(--text-muted); font-size: 0.9rem; }
.auth-footer    { text-align: center; margin-top: 20px; font-size: 0.875rem; color: var(--text-muted); }

/* ============================================================ Profil */
.profile-page { padding: 48px 0; }
.profile-layout { display: grid; grid-template-columns: 260px 1fr; gap: 32px; align-items: start; }
@media (max-width: 768px) { .profile-layout { grid-template-columns: 1fr; } }

.profile-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; text-align: center; box-shadow: var(--shadow-sm); margin-bottom: 16px; }
.profile-avatar { width: 80px; height: 80px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 2rem; font-weight: 800; margin: 0 auto 12px; }
.profile-name   { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.profile-role   { margin-bottom: 8px; }
.profile-email  { font-size: 0.875rem; color: var(--text-muted); }
.profile-nav    { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.profile-nav-link { display: flex; align-items: center; gap: 10px; padding: 12px 20px; color: var(--text-secondary); font-size: 0.9rem; border-bottom: 1px solid var(--border); transition: var(--transition-fast); }
.profile-nav-link:last-child { border-bottom: none; }
.profile-nav-link:hover, .profile-nav-link.active { background: var(--primary-50); color: var(--primary); }
.profile-nav-link.logout { color: var(--danger); }
.profile-nav-link.logout:hover { background: #fef2f2; }

.enrolled-courses { margin-top: 16px; }
.enrolled-course-card { display: flex; justify-content: space-between; align-items: center; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 20px; margin-bottom: 12px; gap: 20px; transition: var(--transition-fast); }
.enrolled-course-card:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.enrolled-course-info { flex: 1; }
.enrolled-course-info h3 { margin: 0 0 8px; font-size: 1rem; }
.enrolled-course-info a { color: var(--text); }
.enrolled-course-info a:hover { color: var(--primary); }

/* ============================================================ Page Hero */
.page-hero {
  position: relative;
  background-image: var(--hero-bg, none);
  background-color: var(--bg-dark);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  min-height: var(--hero-min-h, 220px);
  display: flex;
  align-items: center;
}
.page-hero-overlay {
  position: absolute;
  inset: 0;
  background-color: var(--hero-color, #1e293b);
  opacity: var(--hero-opacity, 0.65);
  pointer-events: none;
}
.page-hero .container {
  display: flex;
  width: 100%;
}
/* Zarovnání celého bloku page-hero-content */
.page-hero-align-left   .container { justify-content: flex-start; }
.page-hero-align-center .container { justify-content: center; }
.page-hero-align-right  .container { justify-content: flex-end; }

.page-hero-content {
  position: relative;
  z-index: 1;
  padding: 52px 0 44px;
  max-width: 720px;
  width: 100%;
}
/* Text a breadcrumb se zarovnají spolu s blokem */
.page-hero-align-left   .page-hero-content { text-align: left; }
.page-hero-align-left   .page-breadcrumb   { justify-content: flex-start; }
.page-hero-align-center .page-hero-content { text-align: center; }
.page-hero-align-center .page-breadcrumb   { justify-content: center; }
.page-hero-align-right  .page-hero-content { text-align: right; }
.page-hero-align-right  .page-breadcrumb   { justify-content: flex-end; }
.page-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 8px;
  font-size: 0.82rem;
  color: rgba(255,255,255,.65);
  margin-bottom: 14px;
  letter-spacing: .01em;
}
.page-breadcrumb a {
  color: rgba(255,255,255,.82);
  text-decoration: none;
  transition: color .15s;
}
.page-breadcrumb a:hover { color: #fff; }
.page-breadcrumb span[aria-hidden] { opacity: .5; }
.page-hero-title {
  color: #fff;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0;
  text-shadow: 0 2px 12px rgba(0,0,0,.3);
}
@media (max-width:640px) {
  .page-hero-content { padding: 36px 0 28px; max-width: 100%; }
}

/* ============================================================ Stránka obsah */
.page-wrapper  { padding: 0; }
.page-article  { }
.page-header   { margin-bottom: 32px; }
.page-title    { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; margin-bottom: 12px; }
.page-perex    { font-size: 1.1rem; color: var(--text-muted); line-height: 1.7; border-left: 3px solid var(--primary); padding-left: 16px; }
.page-content  { line-height: 1.85; font-size: 1rem; color: var(--text-secondary); }
.page-content h2 { margin-top: 40px; font-size: 1.5rem; color: var(--text); }
.page-content h3 { margin-top: 24px; color: var(--text); }
.page-content p  { margin-bottom: 16px; }
.page-content img { border-radius: var(--radius); margin: 16px 0; }
.page-content ul, .page-content ol { padding-left: 20px; margin-bottom: 16px; }
.page-content li { margin-bottom: 8px; }
.page-content pre { background: var(--bg-dark); color: #e2e8f0; padding: 16px; border-radius: var(--radius); overflow-x: auto; font-size: 0.875rem; margin-bottom: 16px; }
.page-content code { background: var(--bg-tertiary); padding: 2px 6px; border-radius: 4px; font-size: 0.88em; }
.page-content pre code { background: none; padding: 0; }
.page-content blockquote { border-left: 3px solid var(--primary); padding: 16px 20px; background: var(--primary-50); border-radius: 0 var(--radius) var(--radius) 0; margin-bottom: 16px; font-style: italic; }

/* ============================================================ Builder výstup */
.builder-cols2  { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin: 16px 0; }
.builder-cols3  { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; margin: 16px 0; }
.builder-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.gallery-item { overflow: hidden; border-radius: var(--radius); }
.gallery-lightbox-trigger { display: block; }
.gallery-lightbox-trigger img { width: 100%; height: 200px; object-fit: cover; border-radius: var(--radius); transition: var(--transition); display: block; }
.gallery-lightbox-trigger:hover img { transform: scale(1.04); opacity: .92; }
.gallery-lightbox-trigger { cursor: zoom-in; }
.cta-section { text-align: center; padding: 64px; border-radius: var(--radius-xl); margin: 24px 0; }
@media (max-width: 640px) { .builder-cols2, .builder-cols3 { grid-template-columns: 1fr; } .lesson-main { padding: 24px; } }

/* FAQ */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 8px; overflow: hidden; }
.faq-question { padding: 16px 20px; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; background: var(--bg); transition: var(--transition-fast); }
.faq-question:hover { background: var(--bg-secondary); }
.faq-answer { padding: 16px 20px; border-top: 1px solid var(--border); color: var(--text-muted); line-height: 1.7; display: none; }
.faq-item.open .faq-answer { display: block; }
.faq-arrow { transition: transform 0.2s; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.feature-card { padding: 24px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); transition: var(--transition); }
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.feature-icon { width: 48px; height: 48px; border-radius: var(--radius); background: var(--primary-50); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; margin-bottom: 16px; }
.feature-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-desc  { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; }

/* Partners */
.partners-grid { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: center; }
.partner-logo  { padding: 12px 20px; border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-muted); font-weight: 700; font-size: 0.875rem; transition: var(--transition-fast); }
.partner-logo:hover { border-color: var(--primary); color: var(--primary); }

/* Quote */
.builder-quote { border-left: 4px solid var(--primary); padding: 20px 28px; margin: 24px 0; background: var(--bg-alt, var(--bg)); border-radius: 0 var(--radius-lg) var(--radius-lg) 0; }
.builder-quote .quote-text { font-size: 1.2rem; font-style: italic; line-height: 1.7; margin: 0 0 12px; color: var(--text); }
.builder-quote .quote-author { font-size: .9rem; color: var(--text-muted); }
.builder-quote .quote-author strong { color: var(--text); }
.builder-quote.text-center { text-align: center; border-left: none; border-top: 4px solid var(--primary); padding: 24px; border-radius: var(--radius-lg); }

/* Hero */
.builder-hero { display: flex; align-items: center; justify-content: center; border-radius: var(--radius-xl); overflow: hidden; margin: 0; padding: 0; }
.hero-inner { padding: 60px 40px; max-width: 720px; width: 100%; }
.hero-title { font-size: clamp(1.8rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.15; margin: 0 0 16px; }
.hero-subtitle { font-size: 1.1rem; opacity: .85; margin: 0 0 28px; line-height: 1.6; }
.hero-btn { font-size: 1rem; padding: 14px 32px; }
@media (max-width: 640px) { .hero-inner { padding: 40px 24px; } .hero-btn { width: 100%; text-align: center; } }

/* Cards */
.builder-cards { display: grid; gap: 24px; margin: 16px 0; }
.builder-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; text-decoration: none; color: inherit; transition: var(--transition); display: block; }
.builder-card:hover { border-color: var(--primary); box-shadow: 0 4px 20px rgba(0,0,0,.08); transform: translateY(-2px); }
.builder-card .card-image img { width: 100%; height: 200px; object-fit: cover; display: block; }
.builder-card .card-body { padding: 20px 24px; }
.builder-card .card-title { margin: 0 0 8px; font-size: 1.05rem; font-weight: 700; }
.builder-card .card-desc { margin: 0; color: var(--text-muted); font-size: .9rem; line-height: 1.6; }
.builder-card .card-btn { margin-top: 16px; display: inline-block; }
.card-btn--arrow .card-btn-arrow { margin-left: 6px; transition: transform 0.2s ease; display: inline-block; vertical-align: middle; }
.card-btn--arrow:hover .card-btn-arrow { transform: translateX(5px); }
/* Overlay layout */
.card-layout-overlay { position: relative; overflow: hidden; padding: 0 !important; background: none !important; border: none !important; }
.card-overlay-wrap { position: relative; min-height: 280px; background-size: cover; background-position: center; border-radius: var(--radius-lg); overflow: hidden; }
.card-overlay-wrap::after { content:''; position:absolute; inset:0; background: linear-gradient(to top, rgba(0,0,0,.75) 0%, rgba(0,0,0,.2) 60%, transparent 100%); }
.card-overlay-inner { position: absolute; inset: 0; z-index: 1; display: flex; flex-direction: column; justify-content: flex-end; padding: 24px; color: #fff; }
.card-overlay-inner .card-title { color: #fff; margin-bottom: 6px; }
.card-overlay-inner .card-desc  { color: rgba(255,255,255,.85); }
.card-overlay-inner .card-btn   { margin-top: 12px; align-self: flex-start; }
@media (max-width: 640px) { .builder-cards { grid-template-columns: 1fr !important; } }

/* Testimonials */
.builder-testimonials { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; margin: 16px 0; }
.testimonial-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; display: flex; flex-direction: column; gap: 16px; }
.testimonial-stars { color: #f59e0b; font-size: 1.1rem; letter-spacing: 2px; }
.testimonial-text { flex: 1; font-style: italic; color: var(--text-muted); line-height: 1.7; margin: 0; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.testimonial-name { display: block; font-weight: 700; font-size: .95rem; }
.testimonial-role { display: block; font-size: .8rem; color: var(--text-muted); margin-top: 2px; }

/* Steps */
.builder-steps { display: flex; flex-direction: column; gap: 0; margin: 16px 0; counter-reset: step; }
.step-item { display: flex; gap: 24px; align-items: flex-start; padding: 24px 0; border-bottom: 1px solid var(--border); }
.step-item:last-child { border-bottom: none; }
.step-number { background: var(--primary); color: #fff; font-weight: 800; font-size: 1rem; border-radius: 50%; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; box-shadow: 0 2px 8px rgba(67,56,202,.35); }
.step-content { flex: 1; padding-top: 8px; }
.step-title { margin: 0 0 8px; font-size: 1.05rem; font-weight: 700; }
.step-desc { margin: 0; color: var(--text-muted); line-height: 1.6; }

/* Alert */
.builder-alert { padding: 14px 20px; border-radius: var(--radius); border-left: 5px solid; margin: 8px 0; font-size: .95rem; line-height: 1.6; }
.builder-alert .alert-title { margin-right: 6px; }
.builder-alert-info    { background: #eff6ff; border-color: #3b82f6; color: #1e40af; }
.builder-alert-success { background: #f0fdf4; border-color: #22c55e; color: #166534; }
.builder-alert-warning { background: #fffbeb; border-color: #f59e0b; color: #92400e; }
.builder-alert-danger  { background: #fef2f2; border-color: #ef4444; color: #991b1b; }

/* Tabs */
.builder-tabs { margin: 16px 0; }
.tabs-nav { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 20px; flex-wrap: wrap; }
.tab-btn { padding: 10px 20px; border: none; background: none; cursor: pointer; font-size: .9rem; font-weight: 600; color: var(--text-muted); border-bottom: 2px solid transparent; margin-bottom: -2px; transition: var(--transition-fast); border-radius: var(--radius) var(--radius) 0 0; }
.tab-btn:hover { color: var(--primary); background: var(--bg-alt, #f8fafc); }
.tab-btn.tabs-active { color: var(--primary); border-bottom-color: var(--primary); background: none; }
.tab-panel { display: none; line-height: 1.7; }
.tab-panel.tabs-active { display: block; }

/* ── Heading block ── */
.heading-wrap { display: block; }
.heading-span {
    display: inline;
}
.heading-underline { margin-top: .5rem; }
.heading-underline-line::after {
    content: '';
    display: inline-block;
    width: 56px;
    height: 4px;
    border-radius: 2px;
    background: currentColor;
    vertical-align: top;
}
.heading-underline-shape svg {
    display: inline-block;
    width: 145px;
    height: auto;
    vertical-align: top;
}

/* ── Carousel ── */
.block-carousel {
    width: 100vw;
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    box-sizing: border-box;
    overflow: hidden;
}

.carousel-container {
    position: relative;
    overflow: hidden;
    width: 100%;
}
.carousel-track {
    display: flex;
    transition: transform .6s cubic-bezier(.4,0,.2,1);
    will-change: transform;
}
.carousel-slide {
    min-width: 100%;
    position: relative;
    min-height: 520px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
}
.carousel-overlay {
    position: absolute;
    inset: 0;
    background: var(--overlay-color, rgba(0,0,0,.45));
    pointer-events: none;
}
.carousel-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: var(--container-max-w, 1200px);
    margin: 0 auto;
    padding: 60px 24px;
    display: flex;
}
.carousel-content {
    max-width: 520px;
    color: #fff;
    position: relative;
    z-index: 10;
}
.carousel-content.side-left  { margin-right: auto; }
.carousel-content.side-right { margin-left: auto; }

.carousel-eyebrow {
    display: block;
    width: fit-content;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    opacity: .8;
    margin-bottom: .55rem;
}
.carousel-heading {
    font-size: clamp(1.6rem, 4vw, 2.6rem);
    font-weight: 700;
    line-height: 1.25;
    margin: 0 0 .4rem;
    color: inherit;
}
.carousel-heading-span { display: inline; }
.carousel-underline {
    display: block;
    margin-bottom: 1rem;
}
.carousel-underline-line {
    width: 56px;
    height: 4px;
    border-radius: 2px;
    background: currentColor;
}
.carousel-underline-shape svg {
    display: block;
    width: 145px;
    height: auto;
}
.carousel-text {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    opacity: .9;
}
/* Carousel bullets */
.carousel-bullets {
    list-style: none;
    margin: 0 0 1.5rem;
    padding: 0;
    font-size: 1.05rem;
    font-family: var(--font-heading, var(--font));
    line-height: 1.7;
    opacity: .9;
    display: flex;
    flex-direction: column;
    gap: .4rem;
}
.carousel-bullets li { display: flex; align-items: center; gap: .6rem; }
.carousel-bullets li .bi { flex-shrink: 0; font-size: 1em; line-height: 1; }
/* Carousel heading span underline */
.carousel-heading-span { display: inline; }
.carousel-heading-span--underline {
    display: inline-block;
    position: relative;
}
.heading-span-ul-line {
    display: block;
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 4px;
    border-radius: 2px;
}
.heading-span-ul-shape {
    display: block;
    position: absolute;
    bottom: -18px;
    left: 0;
    width: 100%;
    pointer-events: none;
    z-index: -1;
}
.heading-span-ul-shape svg { display: block; width: 100%; height: auto; }
.carousel-btn { margin-top: .25rem; display: inline-flex; align-items: center; gap: .45em; }
.carousel-btn-arrow { transition: transform .25s cubic-bezier(.4,0,.2,1); display: inline-block; }
.carousel-btn:hover .carousel-btn-arrow { transform: translateX(5px); }
.btn-white {
    background: #fff;
    color: #1e293b;
    border-color: #fff;
}
.btn-white:hover { background: #f1f5f9; }

/* Decorative images */
.carousel-deco {
    position: absolute;
    z-index: 6;
    pointer-events: none;
    max-width: 28%;
    opacity: 0;
}
.carousel-deco-top-left     { top: 0;    left: 0; }
.carousel-deco-top-right    { top: 0;    right: 0; }
.carousel-deco-bottom-left  { bottom: 0; left: 0; }
.carousel-deco-bottom-right { bottom: 0; right: 0; }

@keyframes decoSlideFromLeft   { from { opacity:0; transform:translateX(-90px); } to { opacity:1; transform:translateX(0); } }
@keyframes decoSlideFromRight  { from { opacity:0; transform:translateX(90px);  } to { opacity:1; transform:translateX(0); } }
@keyframes decoSlideFromTop    { from { opacity:0; transform:translateY(-90px); } to { opacity:1; transform:translateY(0); } }
@keyframes decoSlideFromBottom { from { opacity:0; transform:translateY(90px);  } to { opacity:1; transform:translateY(0); } }
@keyframes decoFadeIn          { from { opacity:0; } to { opacity:1; } }

.carousel-container.deco-visible .carousel-deco-anim-slideFromLeft   { animation: decoSlideFromLeft   .9s cubic-bezier(.22,.61,.36,1) .2s both; }
.carousel-container.deco-visible .carousel-deco-anim-slideFromRight  { animation: decoSlideFromRight  .9s cubic-bezier(.22,.61,.36,1) .35s both; }
.carousel-container.deco-visible .carousel-deco-anim-slideFromTop    { animation: decoSlideFromTop    .9s cubic-bezier(.22,.61,.36,1) .2s both; }
.carousel-container.deco-visible .carousel-deco-anim-slideFromBottom { animation: decoSlideFromBottom .9s cubic-bezier(.22,.61,.36,1) .35s both; }
.carousel-container.deco-visible .carousel-deco-anim-fadeIn          { animation: decoFadeIn          .9s ease .2s both; }

/* Content animations */
@keyframes fadeInUp    { from { opacity:0; transform:translateY(32px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeInLeft  { from { opacity:0; transform:translateX(-32px); } to { opacity:1; transform:translateX(0); } }
@keyframes fadeInRight { from { opacity:0; transform:translateX(32px); }  to { opacity:1; transform:translateX(0); } }
@keyframes fadeIn      { from { opacity:0; } to { opacity:1; } }
@keyframes zoomIn      { from { opacity:0; transform:scale(.9); } to { opacity:1; transform:scale(1); } }

.carousel-slide.active .carousel-content {
    animation: var(--slide-anim, fadeInUp) .6s .15s ease both;
}

/* Arrows */
.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    border: 2px solid rgba(255,255,255,.45);
    color: #fff;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .2s;
    backdrop-filter: blur(4px);
}
.carousel-arrow:hover { background: rgba(255,255,255,.35); }
.carousel-arrow-prev { left: 16px; }
.carousel-arrow-next { right: 16px; }

/* Indicators */
.carousel-indicators {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}
.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,.45);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: background .2s, transform .2s;
}
.carousel-dot.active {
    background: #fff;
    transform: scale(1.35);
}

@media (max-width: 640px) {
    .carousel-slide { min-height: 380px; }
    .carousel-inner { padding: 40px 16px; }
    .carousel-content { max-width: 100%; }
}

/* ── Section block ── */
.block-section {
    width: 100vw;
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    margin-left: 0;
    margin-right: 0;
    box-sizing: border-box;
}
.builder-section-inner {
    max-width: var(--container-max-w, 1200px);
    margin: 0 auto;
    padding: 80px 24px;
    box-sizing: border-box;
}
@media (max-width: 768px) {
    .builder-section-inner { padding-left: 16px; padding-right: 16px; }
}

/* ── Downloader block ── */
.block-downloader-inner {
    display: flex;
    gap: 28px;
    align-items: flex-start;
    background: var(--surface, #f8fafc);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 12px;
    padding: 20px;
    color: var(--text, #1e293b);
}
.downloader-preview {
    flex-shrink: 0;
    width: 200px;
    position: relative;
    border-radius: 8px;
    overflow: hidden;
}
.downloader-preview--pdf {
    height: 260px;
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
}
.downloader-pdf-embed {
    width: 100%;
    height: 100%;
    display: block;
    border: none;
    pointer-events: none;
}
.downloader-pdf-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: #dc2626;
    color: #fff;
    font-size: .65rem;
    font-weight: 700;
    letter-spacing: .08em;
    padding: 2px 6px;
    border-radius: 4px;
    pointer-events: none;
}
.downloader-preview--image {
    height: 260px;
}
.downloader-preview--image img {
    width: 200px;
    height: 260px;
    object-fit: cover;
    display: block;
}
.downloader-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-top: 4px;
}
.downloader-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: inherit;
}
.downloader-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
    flex-wrap: wrap;
}
.downloader-badge {
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 4px;
    color: #fff;
    background: #6366f1;
}
.downloader-badge--new       { background: #16a34a; }
.downloader-badge--important { background: #dc2626; }
.downloader-badge--updated   { background: #d97706; }
.downloader-badge--archive   { background: #64748b; }
.downloader-date {
    font-size: .8rem;
    opacity: .65;
}
.downloader-desc {
    font-size: .9rem;
    color: inherit;
    opacity: .75;
    line-height: 1.55;
}
.downloader-btn {
    align-self: flex-start;
    margin-top: 6px;
}
@media (max-width: 640px) {
    .block-downloader-inner { flex-direction: column; gap: 16px; }
    .downloader-preview { width: 100%; }
    .downloader-preview--pdf { height: 200px; }
    .downloader-preview--image { height: 200px; }
    .downloader-preview--image img { width: 100%; height: 200px; }
}

/* ============================================================ 404 & Empty */
.error-page { text-align: center; padding: 60px 24px; max-width: 600px; margin: 0 auto; }
.error-code { font-size: 8rem; font-weight: 900; color: var(--border); line-height: 1; letter-spacing: -0.04em; }
.error-page h1 { font-size: 2rem; margin-bottom: 12px; }
.error-page p  { color: var(--text-muted); margin-bottom: 32px; }
.error-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.empty-state-page { text-align: center; padding: 80px 24px; }
.empty-icon { font-size: 4rem; margin-bottom: 16px; }

/* ============================================================ Animations */
@keyframes fadeInDown { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:translateY(0); } }
@keyframes slideUp    { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn     { from { opacity:0; } to { opacity:1; } }

/* ============================================================ Utilities */
.hidden { display: none !important; }
.sr-only { position: absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.mt-4 { margin-top: 16px; } .mb-4 { margin-bottom: 16px; }
.mt-8 { margin-top: 32px; } .mb-8 { margin-bottom: 32px; }
.flex { display: flex; } .items-center { align-items: center; }
.justify-between { justify-content: space-between; } .justify-center { justify-content: center; }
.gap-2 { gap: 8px; } .gap-4 { gap: 16px; }
.w-full { width: 100%; } .text-muted { color: var(--text-muted); }

@media (max-width: 768px) {
  .hero-section { padding: 60px 0 50px; }
  .hero-stats { gap: 32px; }
  .courses-grid { grid-template-columns: 1fr; }
}

/* ── Course Categories ───────────────────────────────────────────── */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 40px;
}

.category-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform .2s, box-shadow .2s;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,.1);
}

.category-card-image {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg);
}

.category-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s;
}

.category-card:hover .category-card-image img {
    transform: scale(1.04);
}

.category-card-image--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--text-muted);
    background: var(--bg);
}

.category-card-body {
    flex: 1;
    padding: 20px 24px 12px;
}

.category-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 8px;
}

.category-card-desc {
    color: var(--text-muted);
    font-size: .9rem;
    line-height: 1.5;
    margin: 0 0 10px;
}

.category-card-count {
    font-size: .82rem;
    color: var(--primary);
    font-weight: 600;
    margin: 0;
}

.category-card-footer {
    padding: 0 24px 24px;
}

/* Category detail header */
.category-header {
    margin-bottom: 36px;
}

.category-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 16px 0 8px;
    color: var(--text);
}

.category-desc {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Course list (within category) */
.course-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 24px;
}

.course-list-item {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.course-list-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.course-list-thumb {
    width: 120px;
    min-width: 120px;
    height: 80px;
    border-radius: var(--radius);
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
}
.course-list-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.course-list-thumb--empty {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.course-list-body {
    flex: 1;
    min-width: 0;
}
.course-list-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 6px;
    line-height: 1.35;
    color: var(--text);
}
.course-list-item:hover .course-list-title {
    color: var(--primary);
}
.course-list-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0 0 10px;
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.course-list-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}
.course-tag {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    background: var(--primary-50);
    color: var(--primary);
}
.course-tag--neutral {
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.course-list-aside {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    min-width: 140px;
}
.course-list-price {
    text-align: right;
}
.price-amount {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text);
}
.price-free {
    font-size: 1rem;
    font-weight: 700;
    color: #059669;
}
.course-list-btn {
    white-space: nowrap;
}

@media (max-width: 768px) {
    .course-list-item {
        flex-wrap: wrap;
        gap: 16px;
    }
    .course-list-thumb {
        width: 80px;
        min-width: 80px;
        height: 56px;
    }
    .course-list-body { order: 2; flex-basis: calc(100% - 104px); }
    .course-list-aside {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        min-width: 0;
        border-top: 1px solid var(--border);
        padding-top: 12px;
    }
}

@media (max-width: 480px) {
    .course-list-thumb { display: none; }
    .course-list-body { flex-basis: 100%; }
}

.courses-section {
    padding: 48px 0 80px;
}

.courses-section .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Responsive */
@media (max-width: 1024px) {
    .categories-grid,
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .categories-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }
}

/* ── Lesson Designer (ld-*) ──────────────────────────────────────────────── */

/* Heading 2 — tučný podnadpis s plnou čarou dole */
.ld-h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text, #1e293b);
    margin: 2rem 0 .6rem;
    padding-bottom: .35rem;
    border-bottom: 2px solid var(--primary, #6366f1);
    line-height: 1.35;
    overflow: hidden;
}

/* Heading 3 — střední podnadpis s tečkovanou čarou dole */
.ld-h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary, #475569);
    margin: 1.5rem 0 .4rem;
    padding-bottom: .25rem;
    border-bottom: 1px dashed var(--primary, #6366f1);
    line-height: 1.35;
    overflow: hidden;
}

.ld-intro {
    font-size: 1.12rem;
    line-height: 1.85;
    color: var(--text-secondary, #475569);
    margin-bottom: 1.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 2px solid var(--border-color, #e2e8f0);
}

/* Callout boxes */
.ld-callout {
    display: flex;
    gap: 14px;
    padding: 16px 20px;
    border-radius: 10px;
    overflow: hidden;
    margin: 1.25rem 0;
    border-left: 4px solid;
    line-height: 1.7;
}
.ld-callout-tip     { background: #eff6ff; border-color: #3b82f6; color: #1e3a8a; }
.ld-callout-note    { background: #f8fafc; border-color: #94a3b8; color: #334155; }
.ld-callout-warning { background: #fffbeb; border-color: #f59e0b; color: #78350f; }
.ld-callout-success { background: #f0fdf4; border-color: #22c55e; color: #14532d; }
.ld-callout-danger  { background: #fef2f2; border-color: #ef4444; color: #7f1d1d; }
.ld-callout-icon    { font-size: 1.35rem; line-height: 1.5; flex-shrink: 0; }
.ld-callout-body    { flex: 1; }

/* Key points card */
.ld-keypoints {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 1px solid #bae6fd;
    border-radius: 12px;
    padding: 20px 24px;
    margin: 1.5rem 0;
    overflow: hidden;
}
.ld-keypoints-title {
    font-weight: 700;
    font-size: .78rem;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: #0369a1;
    margin-bottom: 14px;
}
.ld-keypoints-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.ld-keypoints-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 4px 0;
    color: #1e40af;
    font-size: .95rem;
}
.ld-keypoints-list li::before {
    content: "▸";
    font-weight: 800;
    color: #0ea5e9;
    flex-shrink: 0;
    font-size: .95rem;
    margin-top: 1px;
}

/* Wingdings čtvercový bullet → žlutá karta s otazníky */
.ld-questions {
    background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
    border: 1px solid #fde047;
    border-radius: 12px;
    padding: 20px 24px;
    margin: 1.5rem 0;
    overflow: hidden;
}
.ld-questions-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.ld-questions-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 4px 0;
    color: #713f12;
    font-size: .95rem;
}
.ld-questions-list li::before {
    content: "?";
    font-weight: 800;
    color: #ca8a04;
    flex-shrink: 0;
    font-size: 1rem;
    margin-top: 1px;
}

/* Wingdings fajfka (0xFC) → zelená karta s fajfkami */
.ld-checklist {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border: 1px solid #86efac;
    border-radius: 12px;
    padding: 20px 24px;
    margin: 1.5rem 0;
    overflow: hidden;
}
.ld-checklist-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.ld-checklist-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 4px 0;
    color: #14532d;
    font-size: .95rem;
}
.ld-checklist-list li::before {
    content: "✓";
    font-weight: 800;
    color: #16a34a;
    flex-shrink: 0;
    font-size: .95rem;
    margin-top: 1px;
}

/* ── Word hyperlink ───────────────────────────────────────────────────────── */
.ld-link {
    color: var(--primary, #6366f1);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid currentColor;
    transition: opacity .15s;
}
.ld-link::before {
    content: '🔗';
    font-size: .8em;
    margin-right: .3em;
    vertical-align: .05em;
}
.ld-link:hover {
    opacity: .75;
}

/* ── Word tabulka ─────────────────────────────────────────────────────────── */
.ld-table-wrap {
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.ld-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .92rem;
    min-width: 320px;
}
.ld-table thead tr {
    background: linear-gradient(100deg, rgba(99,102,241,.1) 0%, rgba(99,102,241,.05) 100%);
}
.ld-table th {
    padding: 10px 14px;
    text-align: left;
    font-weight: 700;
    font-size: .82rem;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: #4338ca;
    border-bottom: 2px solid #c7d2fe;
    white-space: nowrap;
}
.ld-table td {
    padding: 9px 14px;
    border-bottom: 1px solid #f1f5f9;
    color: var(--text, #1e293b);
    vertical-align: top;
    line-height: 1.5;
}
.ld-table tbody tr:last-child td {
    border-bottom: none;
}
.ld-table tbody tr:hover td {
    background: #f8fafc;
}

/* Styled bullet list */
.ld-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}
.ld-list > li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px solid #f1f5f9;
    line-height: 1.6;
}
.ld-list > li:last-child { border-bottom: none; }
.ld-list > li::before {
    content: "▸";
    color: var(--color-primary, #6366f1);
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Step list (ol) */
.ld-steps {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
    counter-reset: ld-step;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.ld-steps > li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    counter-increment: ld-step;
    padding: 14px 18px;
    background: var(--bg-secondary, #f8fafc);
    border-radius: 10px;
    border: 1px solid var(--border-color, #e2e8f0);
    line-height: 1.65;
}
.ld-steps > li::before {
    content: counter(ld-step);
    min-width: 32px;
    height: 32px;
    background: var(--color-primary, #6366f1);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: .88rem;
    flex-shrink: 0;
}

/* Highlight – nadpis kapitoly */
.ld-highlight {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.4;
    margin: 2rem 0 1.25rem;
    padding: 0 0 10px;
    color: var(--text-primary, #1e293b);
    border-bottom: 2px solid var(--color-primary, #6366f1);
    background: none;
    border-radius: 0;
    box-shadow: none;
}

/* Image figure */
.ld-figure {
    margin: 1.75rem 0;
    text-align: center;
}
.ld-figure img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 24px rgba(0,0,0,.12);
    display: inline-block;
}

/* ── Lesson Bottom Bar ───────────────────────────────────────────────────── */

.lesson-bottom-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 48px;
    margin-top: 0;
    margin-left: -48px;
    margin-right: -48px;
    background: #eff6ff;
    border-top: 1px solid #bfdbfe;
    border-left: none;
    border-right: none;
    border-bottom: none;
    border-radius: 0;
    position: sticky;
    bottom: 0;
    z-index: 50;
}

/* Left */
.lbb-left { flex: 0 0 auto; }

.lbb-done-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: .85rem;
    font-weight: 600;
    color: #15803d;
    background: #dcfce7;
    border: 1px solid #bbf7d0;
    white-space: nowrap;
}

/* Center progress */
.lbb-center {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}
.lbb-progress-info {
    display: flex;
    flex-direction: column;
    white-space: nowrap;
    flex-shrink: 0;
}
.lbb-progress-label {
    font-size: .68rem;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: .07em;
}
.lbb-progress-count {
    font-size: .78rem;
    font-weight: 600;
    color: #334155;
}
.lbb-progress-track {
    flex: 1;
    height: 6px;
    background: #bfdbfe;
    border-radius: 99px;
    overflow: hidden;
    min-width: 60px;
}
.lbb-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6, #6366f1);
    border-radius: 99px;
    transition: width .4s ease;
}
.lbb-progress-pct {
    font-size: .78rem;
    font-weight: 700;
    color: #3b82f6;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 34px;
}

/* Right nav */
.lbb-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Responsive */
@media (max-width: 640px) {
    .lesson-bottom-bar { flex-wrap: wrap; gap: 10px; padding: 14px 24px; margin-left: -24px; margin-right: -24px; }
    .lbb-center { order: 3; flex-basis: 100%; }
    .lbb-progress-info { display: none; }
}

/* ── Self-Evaluation – PDF Viewer ────────────────────────────────────────── */
.se-pdf-viewer {
    margin-top: 2rem;
}

/* Loading state */
.se-pdf-loading {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 40px 0;
    color: #64748b;
    font-size: .95rem;
}

.se-pdf-spinner {
    width: 28px;
    height: 28px;
    border: 3px solid #e2e8f0;
    border-top-color: var(--primary, #6366f1);
    border-radius: 50%;
    animation: se-spin .7s linear infinite;
    flex-shrink: 0;
}

@keyframes se-spin { to { transform: rotate(360deg); } }

/* Pages wrapper — side by side for 2 pages, centered for 1 */
.se-pdf-pages {
    display: none;
    gap: 0;
    justify-content: center;
    align-items: flex-start;
    position: relative;
}

/* Single page: looks like a sheet of paper on a desk */
.se-pdf-page {
    position: relative;
    background: #fff;
    border-radius: 3px 3px 2px 2px;
    box-shadow:
        0 1px 1px rgba(0,0,0,.06),
        0 4px 12px rgba(0,0,0,.10),
        0 16px 40px rgba(0,0,0,.12),
        0 32px 64px rgba(0,0,0,.08);
}

.se-pdf-page canvas {
    display: block;
    border-radius: 2px;
    max-width: 100%;
    height: auto;
}

/* Two-page open-book layout */
.se-pdf-pages--spread {
    gap: 0;
    background: linear-gradient(135deg, #e8ecf0 0%, #f1f4f7 100%);
    border-radius: 16px;
    padding: 32px 24px;
    box-shadow: inset 0 2px 8px rgba(0,0,0,.08);
}

.se-pdf-page--double {
    box-shadow:
        0 2px 4px rgba(0,0,0,.08),
        0 8px 24px rgba(0,0,0,.14),
        0 20px 48px rgba(0,0,0,.10);
}

/* Left page: slight right shadow toward spine */
.se-pdf-page--double:first-child {
    border-radius: 3px 0 0 3px;
    box-shadow:
        -2px 0 6px rgba(0,0,0,.04),
        0 8px 24px rgba(0,0,0,.12),
        4px 0 12px rgba(0,0,0,.08);
}

/* Right page: slight left shadow toward spine */
.se-pdf-page--double:last-child {
    border-radius: 0 3px 3px 0;
    box-shadow:
        2px 0 6px rgba(0,0,0,.04),
        0 8px 24px rgba(0,0,0,.12),
        -4px 0 12px rgba(0,0,0,.08);
}

/* Spine — thin shadow line between pages (hidden for single-page spreads) */
.se-pdf-pages--spread-single::after { display: none; }

.se-pdf-pages--spread::after {
    content: '';
    position: absolute;
    top: 32px;
    bottom: 32px;
    left: 50%;
    width: 2px;
    background: linear-gradient(to bottom,
        transparent 0%,
        rgba(0,0,0,.15) 15%,
        rgba(0,0,0,.25) 50%,
        rgba(0,0,0,.15) 85%,
        transparent 100%
    );
    transform: translateX(-50%);
    pointer-events: none;
}

/* Actions row */
.se-pdf-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    justify-content: flex-end;
}

/* PDF pagination navigation */
.se-pdf-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
    padding: 10px 0;
}
.se-pdf-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 2px solid var(--primary, #6366f1);
    background: transparent;
    color: var(--primary, #6366f1);
    font-size: 1.2rem;
    cursor: pointer;
    transition: background .18s, color .18s;
    line-height: 1;
    padding: 0;
}
.se-pdf-nav-btn:hover:not(:disabled) {
    background: var(--primary, #6366f1);
    color: #fff;
}
.se-pdf-nav-btn:disabled {
    opacity: .35;
    cursor: default;
    border-color: currentColor;
}
.se-pdf-nav-info {
    font-size: .92rem;
    color: var(--text-muted, #64748b);
    min-width: 90px;
    text-align: center;
}

/* Admin – vybraný soubor */
.se-file-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--admin-surface, #1a2332);
    border: 1px solid var(--admin-border, #1f2937);
    border-radius: 8px;
    font-size: .88rem;
}
.se-file-row-name {
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.se-file-empty {
    padding: 10px 12px;
    background: var(--admin-surface, #1a2332);
    border: 1px dashed var(--admin-border, #1f2937);
    border-radius: 8px;
    font-size: .85rem;
    color: var(--text-subtle, #64748b);
}
/* FE fallback embed */
.se-pdf-embed {
    width: 100%;
    min-height: 700px;
    border: none;
    border-radius: 4px;
}

@media print {
    .se-pdf-actions,
    .se-pdf-nav,
    .lesson-sidebar,
    .lesson-nav,
    .lesson-complete-btn { display: none !important; }
    .se-pdf-viewer { margin-top: 0; }
    .se-pdf-pages { background: none !important; padding: 0 !important; box-shadow: none !important; }
    .se-pdf-page { box-shadow: none !important; break-inside: avoid; }
}

@media (max-width: 700px) {
    .se-pdf-pages--spread { flex-direction: column; padding: 16px; gap: 16px; }
    .se-pdf-page--double:first-child,
    .se-pdf-page--double:last-child { border-radius: 3px; box-shadow: 0 4px 16px rgba(0,0,0,.12); }
    .se-pdf-pages--spread::after { display: none; }
    .se-pdf-page canvas { max-width: 100%; height: auto !important; }
}