/* ==========================================================================
   CPD PORTAL — СИСТЕМА ДИЗАЙНУ КУРСІВ ПІДВИЩЕННЯ КВАЛІФІКАЦІЇ ВЧИТЕЛІВ
   (ФІЗИКА, МАТЕМАТИКА, STEM ТА ШТУЧНИЙ ІНТЕЛЕКТ)
   ========================================================================== */

/* 1. Academic Blue (Default Classic) */
:root,
body[data-theme="academic-blue"] {
  --bg-canvas:   #f8fafc;
  --bg-card:     #ffffff;
  --bg-subtle:   #f1f5f9;
  --border-color:#e2e8f0;

  --text-main:   #0f172a;
  --text-heading:#0f172a;
  --text-muted:  #475569;

  --primary-950: #09131f;
  --primary-900: #0f233a;
  --primary-800: #163252;
  --primary-700: #1e40af;
  --primary-600: #2563eb;
  --primary-500: #3b82f6;
  --primary-100: #dbeafe;
  --primary-50:  #eff6ff;

  --accent-600:  #d97706;
  --accent-500:  #f59e0b;
  --accent-100:  #fef3c7;
  --accent-50:   #fffbeb;

  --badge-subject-bg:     #dbeafe;
  --badge-subject-text:   #1e3a8a;
  --badge-subject-border: #bfdbfe;
  --badge-course-bg:      #fef3c7;
  --badge-course-text:    #92400e;
  --badge-course-border:  #fde68a;
  --badge-ext-bg:         #f1f5f9;
  --badge-ext-text:       #1e293b;
  --badge-ext-border:     #cbd5e1;

  --hero-gradient: linear-gradient(135deg, #09131f 0%, #0f233a 60%, #1e40af 100%);
  --header-bg: #0f233a;
}

/* 2. Dark Quantum (Cosmic Dark Mode) */
body[data-theme="dark-quantum"] {
  --bg-canvas:   #0b0f19;
  --bg-card:     #151c2e;
  --bg-subtle:   #1e293b;
  --border-color:#283548;

  --text-main:   #f8fafc;
  --text-heading:#ffffff;
  --text-muted:  #94a3b8;

  --primary-950: #070a12;
  --primary-900: #111827;
  --primary-800: #1e1b4b;
  --primary-700: #4338ca;
  --primary-600: #4f46e5;
  --primary-500: #6366f1;
  --primary-100: #312e81;
  --primary-50:  #1e1b4b;

  --accent-600:  #f59e0b;
  --accent-500:  #fbbf24;
  --accent-100:  #451a03;
  --accent-50:   #291804;

  --badge-subject-bg:     rgba(99, 102, 241, 0.22);
  --badge-subject-text:   #c7d2fe;
  --badge-subject-border: rgba(165, 180, 252, 0.35);
  --badge-course-bg:      rgba(245, 158, 11, 0.22);
  --badge-course-text:    #fde047;
  --badge-course-border:  rgba(250, 204, 21, 0.35);
  --badge-ext-bg:         rgba(30, 41, 59, 0.85);
  --badge-ext-text:       #f8fafc;
  --badge-ext-border:     rgba(255, 255, 255, 0.22);

  --hero-gradient: linear-gradient(135deg, #070a12 0%, #111827 60%, #312e81 100%);
  --header-bg: #111827;
}

/* 3. Emerald Mint (STEM Nature) */
body[data-theme="emerald-mint"] {
  --bg-canvas:   #f0fdf4;
  --bg-card:     #ffffff;
  --bg-subtle:   #dcfce7;
  --border-color:#bbf7d0;

  --text-main:   #064e3b;
  --text-heading:#022c22;
  --text-muted:  #374151;

  --primary-950: #022c22;
  --primary-900: #064e3b;
  --primary-800: #065f46;
  --primary-700: #047857;
  --primary-600: #059669;
  --primary-500: #10b981;
  --primary-100: #d1fae5;
  --primary-50:  #ecfdf5;

  --accent-600:  #ca8a04;
  --accent-500:  #eab308;
  --accent-100:  #fef9c3;
  --accent-50:   #fefce8;

  --badge-subject-bg:     #d1fae5;
  --badge-subject-text:   #065f46;
  --badge-subject-border: #a7f3d0;
  --badge-course-bg:      #fef9c3;
  --badge-course-text:    #854d0e;
  --badge-course-border:  #fef08a;
  --badge-ext-bg:         #f0fdf4;
  --badge-ext-text:       #064e3b;
  --badge-ext-border:     #bbf7d0;

  --hero-gradient: linear-gradient(135deg, #022c22 0%, #064e3b 60%, #047857 100%);
  --header-bg: #064e3b;
}

/* 4. Warm Amber (Parchment & Warm Honey) */
body[data-theme="warm-amber"] {
  --bg-canvas:   #faf7f2;
  --bg-card:     #ffffff;
  --bg-subtle:   #f5efe6;
  --border-color:#e7dfd5;

  --text-main:   #292524;
  --text-heading:#1c1917;
  --text-muted:  #57534e;

  --primary-950: #1c1917;
  --primary-900: #451a03;
  --primary-800: #78350f;
  --primary-700: #854d0e;
  --primary-600: #b45309;
  --primary-500: #d97706;
  --primary-100: #fef3c7;
  --primary-50:  #fffbeb;

  --accent-600:  #9a3412;
  --accent-500:  #c2410c;
  --accent-100:  #ffedd5;
  --accent-50:   #fff7ed;

  --badge-subject-bg:     #fef3c7;
  --badge-subject-text:   #78350f;
  --badge-subject-border: #fde68a;
  --badge-course-bg:      #ffedd5;
  --badge-course-text:    #9a3412;
  --badge-course-border:  #fed7aa;
  --badge-ext-bg:         #f5efe6;
  --badge-ext-text:       #292524;
  --badge-ext-border:     #e7dfd5;

  --hero-gradient: linear-gradient(135deg, #1c1917 0%, #451a03 60%, #78350f 100%);
  --header-bg: #451a03;
}

/* 5. Math Slate (Graphite & Terracotta) */
body[data-theme="math-slate"] {
  --bg-canvas:   #f1f5f9;
  --bg-card:     #ffffff;
  --bg-subtle:   #e2e8f0;
  --border-color:#cbd5e1;

  --text-main:   #0f172a;
  --text-heading:#020617;
  --text-muted:  #475569;

  --primary-950: #020617;
  --primary-900: #0f172a;
  --primary-800: #1e293b;
  --primary-700: #334155;
  --primary-600: #475569;
  --primary-500: #64748b;
  --primary-100: #e2e8f0;
  --primary-50:  #f1f5f9;

  --accent-600:  #c2410c;
  --accent-500:  #ea580c;
  --accent-100:  #ffedd5;
  --accent-50:   #fff7ed;

  --badge-subject-bg:     #e2e8f0;
  --badge-subject-text:   #1e293b;
  --badge-subject-border: #cbd5e1;
  --badge-course-bg:      #ffedd5;
  --badge-course-text:    #9a3412;
  --badge-course-border:  #fed7aa;
  --badge-ext-bg:         #f1f5f9;
  --badge-ext-text:       #0f172a;
  --badge-ext-border:     #cbd5e1;

  --hero-gradient: linear-gradient(135deg, #020617 0%, #0f172a 60%, #334155 100%);
  --header-bg: #0f172a;
}

/* 6. Midnight Onyx (Dark Physics & Cyan) */
body[data-theme="midnight-onyx"] {
  --bg-canvas:   #111827;
  --bg-card:     #1f2937;
  --bg-subtle:   #374151;
  --border-color:#4b5563;

  --text-main:   #f9fafb;
  --text-heading:#ffffff;
  --text-muted:  #9ca3af;

  --primary-950: #030712;
  --primary-900: #111827;
  --primary-800: #1f2937;
  --primary-700: #0284c7;
  --primary-600: #0ea5e9;
  --primary-500: #38bdf8;
  --primary-100: #0c4a6e;
  --primary-50:  #082f49;

  --accent-600:  #e11d48;
  --accent-500:  #f43f5e;
  --accent-100:  #4c0519;
  --accent-50:   #27020d;

  --badge-subject-bg:     rgba(14, 165, 233, 0.22);
  --badge-subject-text:   #7dd3fc;
  --badge-subject-border: rgba(56, 189, 248, 0.35);
  --badge-course-bg:      rgba(244, 63, 94, 0.22);
  --badge-course-text:    #fecdd3;
  --badge-course-border:  rgba(251, 113, 133, 0.35);
  --badge-ext-bg:         rgba(31, 41, 55, 0.9);
  --badge-ext-text:       #f9fafb;
  --badge-ext-border:     rgba(255, 255, 255, 0.22);

  --hero-gradient: linear-gradient(135deg, #030712 0%, #111827 60%, #1e3a8a 100%);
  --header-bg: #111827;
}

/* 7. Nordic Ice (Oceanic Cyan) */
body[data-theme="nordic-ice"] {
  --bg-canvas:   #f0f9ff;
  --bg-card:     #ffffff;
  --bg-subtle:   #e0f2fe;
  --border-color:#bae6fd;

  --text-main:   #083344;
  --text-heading:#082f49;
  --text-muted:  #334155;

  --primary-950: #021a1a;
  --primary-900: #042f2e;
  --primary-800: #115e59;
  --primary-700: #0f766e;
  --primary-600: #0d9488;
  --primary-500: #14b8a6;
  --primary-100: #ccfbf1;
  --primary-50:  #f0fdfa;

  --accent-600:  #ea580c;
  --accent-500:  #f97316;
  --accent-100:  #ffedd5;
  --accent-50:   #fff7ed;

  --badge-subject-bg:     #ccfbf1;
  --badge-subject-text:   #115e59;
  --badge-subject-border: #99f6e4;
  --badge-course-bg:      #ffedd5;
  --badge-course-text:    #9a3412;
  --badge-course-border:  #fed7aa;
  --badge-ext-bg:         #f0fdfa;
  --badge-ext-text:       #0f766e;
  --badge-ext-border:     #99f6e4;

  --hero-gradient: linear-gradient(135deg, #021a1a 0%, #042f2e 60%, #0f766e 100%);
  --header-bg: #042f2e;
}

/* 8. Terracotta Clay (Warm Sand) */
body[data-theme="terracotta-clay"] {
  --bg-canvas:   #fff7ed;
  --bg-card:     #ffffff;
  --bg-subtle:   #ffedd5;
  --border-color:#fed7aa;

  --text-main:   #431407;
  --text-heading:#2a0802;
  --text-muted:  #57534e;

  --primary-950: #1c1917;
  --primary-900: #431407;
  --primary-800: #7c2d12;
  --primary-700: #9a3412;
  --primary-600: #c2410c;
  --primary-500: #ea580c;
  --primary-100: #ffedd5;
  --primary-50:  #fff7ed;

  --accent-600:  #b45309;
  --accent-500:  #d97706;
  --accent-100:  #fef3c7;
  --accent-50:   #fffbeb;

  --badge-subject-bg:     #ffedd5;
  --badge-subject-text:   #7c2d12;
  --badge-subject-border: #fed7aa;
  --badge-course-bg:      #fef3c7;
  --badge-course-text:    #92400e;
  --badge-course-border:  #fde68a;
  --badge-ext-bg:         #fff7ed;
  --badge-ext-text:       #431407;
  --badge-ext-border:     #fed7aa;

  --hero-gradient: linear-gradient(135deg, #1c1917 0%, #7c2d12 60%, #9a3412 100%);
  --header-bg: #7c2d12;
}

:root {
  --success-700: #047857;
  --success-600: #059669;
  --success-500: #10b981;
  --success-100: #d1fae5;
  --success-50:  #ecfdf5;

  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   18px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  --shadow-sm:   0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md:   0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg:   0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl:   0 20px 25px -5px rgba(15, 23, 42, 0.10), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

  --font-sans:   'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body[data-font="plus-jakarta"] {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}
body[data-font="inter"] {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
body[data-font="montserrat"] {
  --font-sans: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
}
body[data-font="roboto"] {
  --font-sans: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-canvas);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ==========================================================================
   DARK MODE OVERRIDES & SURFACE HARMONIZATION
   ========================================================================== */
body[data-theme="dark-quantum"],
body[data-theme="midnight-onyx"] {
  background-color: var(--bg-canvas) !important;
  color: var(--text-main) !important;
}

body[data-theme="dark-quantum"] .card,
body[data-theme="midnight-onyx"] .card,
body[data-theme="dark-quantum"] .course-card,
body[data-theme="midnight-onyx"] .course-card,
body[data-theme="dark-quantum"] .person-card,
body[data-theme="midnight-onyx"] .person-card,
body[data-theme="dark-quantum"] .filter-sidebar-card,
body[data-theme="midnight-onyx"] .filter-sidebar-card,
body[data-theme="dark-quantum"] .lecture-item-card,
body[data-theme="midnight-onyx"] .lecture-item-card {
  background-color: var(--bg-card) !important;
  border-color: var(--border-color) !important;
  color: var(--text-main) !important;
}

body[data-theme="dark-quantum"] .bg-white,
body[data-theme="midnight-onyx"] .bg-white {
  background-color: var(--bg-card) !important;
  color: var(--text-main) !important;
}

body[data-theme="dark-quantum"] .bg-light,
body[data-theme="midnight-onyx"] .bg-light {
  background-color: var(--bg-subtle) !important;
  color: var(--text-main) !important;
}

body[data-theme="dark-quantum"] .main-navbar,
body[data-theme="midnight-onyx"] .main-navbar {
  background-color: var(--bg-card) !important;
  border-color: var(--border-color) !important;
}

body[data-theme="dark-quantum"] .stats-banner,
body[data-theme="midnight-onyx"] .stats-banner {
  background-color: var(--bg-card) !important;
  border-color: var(--border-color) !important;
  color: var(--text-main) !important;
}

body[data-theme="dark-quantum"] .text-slate-900,
body[data-theme="dark-quantum"] .text-slate-800,
body[data-theme="dark-quantum"] .text-slate-700,
body[data-theme="dark-quantum"] .text-primary-900,
body[data-theme="midnight-onyx"] .text-slate-900,
body[data-theme="midnight-onyx"] .text-slate-800,
body[data-theme="midnight-onyx"] .text-slate-700,
body[data-theme="midnight-onyx"] .text-primary-900 {
  color: var(--text-heading) !important;
}

body[data-theme="dark-quantum"] .text-slate-600,
body[data-theme="dark-quantum"] .text-slate-500,
body[data-theme="dark-quantum"] .text-muted,
body[data-theme="midnight-onyx"] .text-slate-600,
body[data-theme="midnight-onyx"] .text-slate-500,
body[data-theme="midnight-onyx"] .text-muted {
  color: var(--text-muted) !important;
}

body[data-theme="dark-quantum"] .nav-link-custom,
body[data-theme="midnight-onyx"] .nav-link-custom {
  color: var(--text-main) !important;
}

body[data-theme="dark-quantum"] .form-control,
body[data-theme="dark-quantum"] .form-select,
body[data-theme="midnight-onyx"] .form-control,
body[data-theme="midnight-onyx"] .form-select {
  background-color: var(--bg-card) !important;
  color: var(--text-main) !important;
  border-color: var(--border-color) !important;
}

/* ==========================================================================
   NAVIGATION & HEADER FORMATS
   ========================================================================== */

/* 1. Top Notice Bar */
.top-notice-bar {
  background-color: var(--primary-950);
  color: #cbd5e1;
  font-size: 0.8125rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-notice-bar a {
  color: #e2e8f0;
  text-decoration: none;
  transition: color 0.15s ease;
}

.top-notice-bar a:hover {
  color: #ffffff;
}

/* 2. Main Navbar Default */
.main-navbar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  padding: 0.85rem 0;
  position: sticky;
  top: 0;
  z-index: 1020;
  transition: all 0.3s ease;
}

.navbar-brand-custom {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-heading);
  flex-shrink: 0;
  margin-right: 1.5rem;
}

.navbar-brand-custom .brand-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary-700), var(--primary-600));
  color: #ffffff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
  flex-shrink: 0;
}

.navbar-brand-custom .brand-title {
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.2;
  color: var(--text-heading);
  white-space: nowrap;
}

.nav-link-custom {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

.nav-link-custom i {
  font-size: 1.05rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-link-custom:hover,
.nav-link-custom.active {
  color: var(--primary-700);
  background-color: var(--primary-50);
}

/* ==========================================================================
   FORMAT 2: CENTERED HEADER (horizontal-centered)
   ========================================================================== */
body[data-header-layout="horizontal-centered"] .main-navbar .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.75rem;
}

body[data-header-layout="horizontal-centered"] .main-navbar .navbar-brand-custom {
  margin: 0 auto;
}

body[data-header-layout="horizontal-centered"] .main-navbar .navbar-collapse {
  width: 100%;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  justify-content: center;
}

body[data-header-layout="horizontal-centered"] .main-navbar .navbar-nav {
  margin: 0 auto !important;
  justify-content: center;
}

body[data-header-layout="horizontal-centered"] .main-navbar .d-flex.align-items-center.gap-2 {
  margin: 0.5rem auto 0 auto;
  justify-content: center;
}

/* ==========================================================================
   FORMAT 3: COMPACT FLOATING ISLAND (horizontal-compact)
   ========================================================================== */
@media (min-width: 992px) {
  body[data-header-layout="horizontal-compact"] .top-notice-bar {
    display: none !important;
  }

  body[data-header-layout="horizontal-compact"] .main-navbar {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 2rem);
    max-width: 1280px;
    border-radius: var(--radius-full);
    background: var(--bg-card) !important;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
    border: 1px solid var(--border-color);
    z-index: 1030;
    padding: 0.4rem 1.25rem;
  }

  body[data-header-layout="horizontal-compact"] .main-navbar .container {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }

  body[data-header-layout="horizontal-compact"] .navbar-brand-custom {
    margin-right: 1rem;
    gap: 0.5rem;
  }

  body[data-header-layout="horizontal-compact"] .navbar-brand-custom .brand-icon {
    width: 38px;
    height: 38px;
    font-size: 1.15rem;
  }

  body[data-header-layout="horizontal-compact"] .navbar-brand-custom .brand-title {
    font-size: 1.02rem;
  }

  body[data-header-layout="horizontal-compact"] .nav-link-custom {
    padding: 0.4rem 0.65rem;
    font-size: 0.88rem;
  }

  body[data-header-layout="horizontal-compact"] .btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.82rem;
    white-space: nowrap;
  }

  /* Clean dark mode island without stray white borders */
  body[data-header-layout="horizontal-compact"][data-theme="dark-quantum"] .main-navbar,
  body[data-header-layout="horizontal-compact"][data-theme="midnight-onyx"] .main-navbar {
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    background: rgba(21, 28, 46, 0.95) !important;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6) !important;
  }

  body[data-header-layout="horizontal-compact"] .hero-wrapper {
    padding-top: 7rem !important;
  }

  body[data-header-layout="horizontal-compact"] .page-header-banner {
    padding-top: 6rem !important;
  }
}

/* ==========================================================================
   FORMAT 4: VERTICAL SIDEBAR & COLLAPSIBLE SIDEBAR ON PC
   ========================================================================== */
.sidebar-collapse-toggle-btn {
  display: none;
}

@media (min-width: 992px) {
  body[data-header-layout="vertical-sidebar"] .top-notice-bar {
    display: none !important;
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    height: 100vh;
    overflow-y: auto;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 2rem 1.25rem;
    border-right: 1px solid var(--border-color);
    border-bottom: none;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.04);
    background: var(--bg-card);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  }

  body[data-header-layout="vertical-sidebar"] .sidebar-collapse-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-main);
    cursor: pointer;
    margin-left: auto;
    margin-bottom: 1rem;
    transition: all 0.2s ease;
  }

  body[data-header-layout="vertical-sidebar"] .sidebar-collapse-toggle-btn:hover {
    background: var(--primary-50);
    color: var(--primary-700);
    border-color: var(--primary-500);
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .container {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0;
    align-items: stretch;
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .navbar-brand-custom {
    margin-bottom: 1.5rem;
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .navbar-collapse {
    display: flex !important;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    width: 100%;
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .navbar-nav {
    flex-direction: column !important;
    width: 100%;
    gap: 0.4rem;
    margin: 0 !important;
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .nav-link-custom {
    display: flex;
    align-items: center;
    padding: 0.65rem 0.85rem;
    font-size: 0.92rem;
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .d-flex.align-items-center.gap-2 {
    flex-direction: column;
    width: 100%;
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
  }

  body[data-header-layout="vertical-sidebar"] .main-navbar .d-flex.align-items-center.gap-2 .btn {
    width: 100%;
    justify-content: center;
  }

  body[data-header-layout="vertical-sidebar"] #main-content,
  body[data-header-layout="vertical-sidebar"] .site-footer {
    margin-left: 280px;
    width: calc(100% - 280px);
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1), width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  /* Collapsed Sidebar Mode on Desktop */
  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .main-navbar {
    width: 80px;
    padding: 1.5rem 0.5rem;
    align-items: center;
  }

  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .main-navbar .brand-title,
  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .main-navbar .nav-link-text,
  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .main-navbar .btn-text {
    display: none !important;
  }

  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .main-navbar .nav-link-custom {
    justify-content: center;
    padding: 0.75rem 0.5rem;
    font-size: 1.15rem;
  }

  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .main-navbar .sidebar-collapse-toggle-btn {
    margin: 0 auto 1rem auto;
    transform: rotate(180deg);
  }

  body[data-header-layout="vertical-sidebar"].sidebar-collapsed #main-content,
  body[data-header-layout="vertical-sidebar"].sidebar-collapsed .site-footer {
    margin-left: 80px;
    width: calc(100% - 80px);
  }
}

/* ==========================================================================
   PAGE HEADERS (DYNAMIC HIGH CONTRAST BACKGROUND)
   ========================================================================== */
.page-header-banner {
  background: var(--header-bg) !important;
  color: #ffffff !important;
  padding: 3.5rem 0;
  position: relative;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.3s ease;
}

.page-header-banner h1,
.page-header-banner .h1,
.page-header-banner h2 {
  color: #ffffff !important;
  font-weight: 800;
}

.page-header-banner p.lead,
.page-header-banner .lead-text {
  color: #e2e8f0 !important;
}

.page-header-banner .breadcrumb {
  background: transparent;
  padding: 0;
  margin-bottom: 0.75rem;
}

.page-header-banner .breadcrumb-item {
  color: #94a3b8 !important;
  font-size: 0.88rem;
}

.page-header-banner .breadcrumb-item a {
  color: #cbd5e1 !important;
  text-decoration: none;
}

.page-header-banner .breadcrumb-item a:hover {
  color: #ffffff !important;
  text-decoration: underline;
}

.page-header-banner .breadcrumb-item.active {
  color: #ffffff !important;
  font-weight: 600;
}

.page-header-banner .breadcrumb-item + .breadcrumb-item::before {
  color: #64748b !important;
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */
.btn-primary-custom {
  background-color: var(--primary-700);
  border-color: var(--primary-700);
  color: #ffffff !important;
  font-weight: 600;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 6px rgba(30, 64, 175, 0.25);
  text-decoration: none;
}

.btn-primary-custom:hover {
  background-color: var(--primary-800);
  border-color: var(--primary-800);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.35);
}

.btn-outline-custom {
  background-color: var(--bg-card);
  border: 1.5px solid var(--border-color);
  color: var(--text-main) !important;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-outline-custom:hover {
  border-color: var(--primary-700);
  color: var(--primary-700) !important;
  background-color: var(--primary-50);
}

.badge-custom {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  line-height: 1.2;
  white-space: nowrap !important;
  flex-shrink: 0 !important;
}

.badge-banner-code {
  background-color: #ffffff !important;
  color: #0f172a !important;
  border: 1px solid #e2e8f0 !important;
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  font-size: 0.82rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
}

.badge-duration {
  background-color: var(--primary-100) !important;
  color: var(--primary-800) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.65rem;
  font-size: 0.82rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
}

/* Dedicated Subject & Meta Badges (Theme-aware & Contrast Adaptive) */
.badge-subject,
.badge.bg-primary-50,
.badge.bg-primary-100 {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.76rem;
  font-weight: 700 !important;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--badge-subject-bg, var(--primary-100)) !important;
  color: var(--badge-subject-text, var(--primary-900)) !important;
  border: 1px solid var(--badge-subject-border, var(--border-color)) !important;
  line-height: 1.35;
  white-space: normal !important;
  word-break: normal;
  overflow-wrap: break-word;
  flex-shrink: 1;
  min-width: 0;
}

.badge-course-ref,
.badge.bg-amber-50,
.badge.bg-warning-subtle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.74rem;
  font-weight: 700 !important;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--badge-course-bg, var(--accent-100)) !important;
  color: var(--badge-course-text, var(--accent-600)) !important;
  border: 1px solid var(--badge-course-border, var(--border-color)) !important;
  line-height: 1.2;
}

.badge-file-ext,
.badge-category-neutral,
.badge.bg-light {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700 !important;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  background-color: var(--badge-ext-bg, var(--bg-subtle)) !important;
  color: var(--badge-ext-text, var(--text-main)) !important;
  border: 1px solid var(--badge-ext-border, var(--border-color)) !important;
  line-height: 1.2;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-700) !important;
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.85rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.badge-custom.badge-success,
.badge-success {
  background-color: var(--success-100, #dcfce7) !important;
  color: var(--success-700, #166534) !important;
  border: 1px solid var(--success-500, #86efac) !important;
  font-weight: 700 !important;
}

.badge-custom.badge-primary,
.badge-primary {
  background-color: var(--badge-subject-bg, var(--primary-100)) !important;
  color: var(--badge-subject-text, var(--primary-800)) !important;
  border: 1px solid var(--badge-subject-border, var(--border-color)) !important;
  font-weight: 700 !important;
}

.badge-custom.badge-warning,
.badge-warning {
  background-color: var(--badge-course-bg, var(--accent-100)) !important;
  color: var(--badge-course-text, var(--accent-600)) !important;
  border: 1px solid var(--badge-course-border, var(--border-color)) !important;
  font-weight: 700 !important;
}

.badge-custom.badge-secondary,
.badge-secondary {
  background-color: var(--badge-ext-bg, var(--bg-subtle)) !important;
  color: var(--text-muted) !important;
  border: 1px solid var(--badge-ext-border, var(--border-color)) !important;
  font-weight: 700 !important;
}

/* Dark mode theme overrides for maximum contrast */
body[data-theme="dark-quantum"] .badge-custom.badge-success,
body[data-theme="midnight-onyx"] .badge-custom.badge-success {
  background-color: rgba(20, 83, 45, 0.6) !important;
  color: #86efac !important;
  border-color: rgba(74, 222, 128, 0.4) !important;
}

body[data-theme="dark-quantum"] .badge-custom.badge-warning,
body[data-theme="midnight-onyx"] .badge-custom.badge-warning {
  background-color: rgba(120, 53, 15, 0.6) !important;
  color: #fde047 !important;
  border-color: rgba(250, 204, 21, 0.4) !important;
}

body[data-theme="dark-quantum"] .badge-custom.badge-secondary,
body[data-theme="midnight-onyx"] .badge-custom.badge-secondary {
  background-color: rgba(30, 41, 59, 0.8) !important;
  color: #cbd5e1 !important;
  border-color: rgba(255, 255, 255, 0.2) !important;
}

body[data-theme="dark-quantum"] .badge-custom.badge-secondary,
body[data-theme="midnight-onyx"] .badge-custom.badge-secondary {
  background-color: rgba(30, 41, 59, 0.8) !important;
  color: #cbd5e1 !important;
  border-color: rgba(255, 255, 255, 0.2) !important;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-wrapper {
  background: var(--hero-gradient) !important;
  color: #ffffff !important;
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
  transition: background 0.3s ease;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  color: #f1f5f9;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-weight: 800;
  font-size: 2.75rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: #ffffff !important;
  margin-bottom: 1.25rem;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }
}

.hero-subtitle {
  font-size: 1.15rem;
  color: #cbd5e1 !important;
  line-height: 1.6;
  max-width: 680px;
  margin-bottom: 2rem;
}

/* ==========================================================================
   STATS SECTION
   ========================================================================== */
.stats-banner {
  background-color: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 1.75rem 2rem;
  margin-top: -2.5rem;
  position: relative;
  z-index: 10;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.stat-item {
  text-align: center;
  padding: 0.5rem 1rem;
}

.stat-value {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary-700);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ==========================================================================
   CARDS & COMPONENTS
   ========================================================================== */
.course-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  height: 100%;
  box-shadow: var(--shadow-sm);
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-500);
}

.course-card-header {
  padding: 1.25rem 1.25rem 0.5rem;
}

.course-card-body {
  padding: 0.75rem 1.25rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.course-card-footer {
  padding: 1rem 1.25rem;
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.course-meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--text-main) !important;
  background-color: var(--bg-subtle) !important;
  border: 1px solid var(--border-color) !important;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
}

.person-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s ease;
  height: 100%;
  box-shadow: var(--shadow-sm);
}

.person-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-500);
}

.person-avatar-wrapper {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 1rem;
  overflow: hidden;
  background-color: var(--primary-50);
  border: 3px solid var(--bg-card);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--primary-600);
}

.person-avatar-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.person-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 0.25rem;
}

.person-role {
  font-size: 0.85rem;
  color: var(--primary-700);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.person-org {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.lecture-item-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: all 0.2s ease;
}

.lecture-item-card:hover {
  border-color: var(--primary-500);
  box-shadow: var(--shadow-md);
}

.lecture-number-badge {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--primary-700);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}

/* ==========================================================================
   FILTER SIDEBAR
   ========================================================================== */
.filter-sidebar-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.form-label-custom {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 0.4rem;
  display: block;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  background-color: var(--bg-card);
  border: 1.5px solid var(--border-color);
  color: var(--text-main);
  text-decoration: none;
  transition: all 0.15s ease;
}

.filter-chip:hover,
.filter-chip.active {
  background-color: var(--primary-700);
  border-color: var(--primary-700);
  color: #ffffff !important;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background-color: var(--primary-950);
  color: #94a3b8;
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: auto;
}

.site-footer h5 {
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.site-footer a {
  color: #cbd5e1;
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-footer a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.75rem;
  margin-top: 3rem;
  font-size: 0.8125rem;
}

/* ==========================================================================
   CTA BANNER
   ========================================================================== */
.cta-banner {
  background: var(--hero-gradient) !important;
  color: #ffffff !important;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
}

.cta-banner h2,
.cta-banner h3,
.cta-banner h4 {
  color: #ffffff !important;
  font-weight: 800;
}

.cta-banner .lead,
.cta-banner p {
  color: rgba(255, 255, 255, 0.92) !important;
}

/* Hide Wagtail Userbar Bird Icon */
[data-wagtail-userbar],
.w-userbar,
.wagtail-userbar {
  display: none !important;
}