/* ==========================================================================
   Design System Tokens — SPR-2.0.1
   ========================================================================== */
:root {
  /* LIGHT theme — Khan-Academy-inspired default (REQ-7.4.1/7.4.2) */
  --bg-primary: #f7f8fa;
  --bg-surface: #ffffff;
  --bg-elevated: #eef1f5;
  --text-primary: #21242c;
  --text-secondary: #5b6573;
  --accent-primary: #1865f2;   /* friendly blue */
  --accent-warm: #f59e0b;
  --accent-success: #00875a;    /* trustworthy green */
  --accent-cta: #00875a;
  --border: #e3e6eb;
  --nav-bg: #ffffff;
  --nav-text: #21242c;
  --card-shadow: 0 1px 3px rgba(20,30,50,.08), 0 1px 2px rgba(20,30,50,.06);
  --radius: 12px;

  /* Spacing */
  --space-section: 4rem;
  --space-card: 1.5rem;
  --max-content-width: 1200px;

  /* Typography */
  --font-heading: 'Heebo', Arial, sans-serif;
  --font-body: 'Heebo', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* DARK theme (the previous look) — opt-in via the toggle (REQ-7.4.2) */
html[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-surface: #1a1d27;
  --bg-elevated: #252836;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent-primary: #3b82f6;
  --accent-warm: #f59e0b;
  --accent-success: #10b981;
  --accent-cta: #16a34a;
  --border: #2d3149;
  --nav-bg: #14161f;
  --nav-text: #f1f5f9;
  --card-shadow: 0 1px 3px rgba(0,0,0,.4);
}

/* --- Theme-aware overrides for Bootstrap dark utilities --- */
.navbar.bg-dark { background: var(--nav-bg) !important; border-bottom: 1px solid var(--border); }
.navbar-dark .navbar-brand,
.navbar-dark .nav-link,
.navbar-dark .navbar-nav .nav-link { color: var(--nav-text) !important; }
.navbar-dark .navbar-toggler-icon { filter: var(--theme-light, none); }
footer.bg-dark { background: var(--nav-bg) !important; border-top: 1px solid var(--border); }
footer.bg-dark .text-secondary, footer.bg-dark a.text-secondary { color: var(--text-secondary) !important; }
.table-dark { --bs-table-bg: var(--bg-surface); --bs-table-color: var(--text-primary);
              --bs-table-border-color: var(--border); color: var(--text-primary); }
.badge.bg-dark { background: var(--bg-elevated) !important; color: var(--text-primary) !important; }
.btn { border-radius: 10px; }

/* ==========================================================================
   Base styles
   ========================================================================== */
body {
    font-family: var(--font-body), Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-family: var(--font-heading);
}

/* Ensure text-muted is visible on dark backgrounds */
.text-muted {
    color: var(--text-secondary) !important;
}

/* ==========================================================================
   Component: .card-surface
   ========================================================================== */
.card-surface {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: var(--space-card);
}

/* ==========================================================================
   Homepage hero
   ========================================================================== */
.hero {
  padding: 4.5rem 1rem 3rem;
  text-align: center;
  background: radial-gradient(circle at 50% -10%, rgba(59, 130, 246, 0.14), transparent 60%);
  border-radius: 16px;
}
.hero-badge {
  display: inline-block;
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-warm);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: 999px;
  padding: 0.35rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.75rem;
}
.hero-title {
  font-size: clamp(3.25rem, 9vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.75rem;
}
.hero-tagline {
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}
.hero-punch {
  max-width: 660px;
  margin: 0 auto 2rem;
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.75;
}
.hero-cta {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Slim homepage hero — keeps the joke but stays out of the way so cards show on entry */
.hero-slim {
  text-align: center;
  padding: 1.25rem 1rem 0.25rem;
}
.hero-brand {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.35rem;
}
.hero-joke {
  max-width: 720px;
  margin: 0 auto;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Feature cards (the "what's actually here" grid) */
.feature-card {
  height: 100%;
  display: block;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}
.feature-card .feature-icon {
  font-size: 1.9rem;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
  display: block;
}
.feature-card.is-soon {
  opacity: 0.65;
  cursor: default;
}
.feature-card.is-soon:hover {
  transform: none;
  border-color: var(--border);
}
.feature-card.is-soon .feature-icon {
  color: var(--text-secondary);
}
.soon-badge {
  display: inline-block;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 600;
  vertical-align: middle;
}
.live-badge {
  display: inline-block;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 600;
  vertical-align: middle;
}

/* Apex section cards (the four big pillars) */
.apex-card {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  height: 100%;
  padding: 1.6rem 1.75rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.apex-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}
.apex-icon {
  font-size: 2.6rem;
  color: var(--accent-primary);
  flex-shrink: 0;
}
.apex-card.is-soon .apex-icon {
  color: var(--text-secondary);
}

/* Training catalog — domain & track grouping */
.domain-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.domain-icon {
  font-size: 2.2rem;
  color: var(--accent-primary);
  flex-shrink: 0;
  line-height: 1.2;
}
.track-title {
  border-inline-start: 3px solid var(--accent-primary);
  padding-inline-start: 0.6rem;
  margin-bottom: 1rem;
}
.track-title .bi {
  color: var(--accent-primary);
}

/* Drill-down browse cards (domain / track tiles) */
.browse-card {
  display: block;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.browse-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}
.browse-icon {
  font-size: 2.1rem;
  color: var(--accent-primary);
  flex-shrink: 0;
  line-height: 1.1;
}
.browse-card.is-soon {
  cursor: default;
}
.browse-card.is-soon:hover {
  transform: none;
  border-color: var(--border);
}
.browse-card.is-soon .browse-icon {
  color: var(--text-secondary);
}
.browse-hints {
  line-height: 2;
}
.hint-chip {
  display: inline-block;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.15rem 0.65rem;
  font-size: 0.72rem;
  margin-inline-end: 0.25rem;
  text-decoration: none;
}
a.hint-chip:hover {
  color: var(--text-primary);
}

/* Per-level intro cards (top of a domain page) */
.intro-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  height: 100%;
  padding: 0.85rem 1rem;
  text-decoration: none;
  color: var(--text-primary);
  border-inline-start: 3px solid var(--accent-primary);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.intro-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}
.intro-card.is-soon {
  opacity: 0.7;
  border-inline-start-color: var(--border);
  cursor: default;
}
.intro-card.is-soon:hover {
  transform: none;
}
.intro-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-primary);
}
.intro-card.is-soon .intro-label {
  color: var(--text-secondary);
}
.intro-title {
  font-weight: 600;
  font-size: 0.95rem;
}

/* ==========================================================================
   Component: .whatsapp-sticky
   ========================================================================== */
.whatsapp-sticky {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  background-color: var(--accent-cta);
  color: #fff;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.whatsapp-sticky:hover {
  background-color: #15803d;
  color: #fff;
}

/* RTL mirror */
html[dir="rtl"] .whatsapp-sticky {
  right: auto;
  left: 16px;
}

/* Mobile: shrink to 48px */
@media (max-width: 768px) {
  .whatsapp-sticky {
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
    bottom: 1rem;
    right: 1rem;
  }
}

/* ==========================================================================
   Keyboard focus
   ========================================================================== */
:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Corporate page components
   ========================================================================== */
.corporate-hero-photo {
  max-width: 300px;
  height: auto;
  border-radius: 50%;
}

@media (max-width: 768px) {
  .corporate-hero-photo {
    max-width: 200px;
  }
}

.corporate-cta-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.corporate-tier-cta {
  width: 100%;
  display: block;
}

/* Lesson notes markdown content */
.lesson-notes { padding: var(--space-card); }
.lesson-notes pre {
    background: var(--bg-elevated);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    direction: ltr;
    text-align: left;
}
.lesson-notes code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    direction: ltr;
    unicode-bidi: embed;
}
.lesson-notes table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
    font-size: 0.9rem;
}
.lesson-notes th,
.lesson-notes td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
    text-align: start;
    vertical-align: top;
}
.lesson-notes thead th {
    background: var(--bg-elevated);
    font-weight: 600;
}
.lesson-notes tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

/* Lesson reflection (AI feedback) */
.reflection-bubble {
    border-radius: 12px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    line-height: 1.65;
}
.reflection-user {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
}
.reflection-ai {
    background: rgba(59, 130, 246, 0.10);
    border: 1px solid rgba(59, 130, 246, 0.30);
}
.reflection-ai .bi {
    color: var(--accent-primary);
}

/* ==========================================================================
   Lesson page — two-column layout
   ========================================================================== */
.lesson-layout {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

/* Sidebar — rendered FIRST in HTML so it sits on the right in RTL */
.lesson-sidebar {
  flex-shrink: 0;
  width: 280px;
}

.lesson-sidebar-inner {
  position: sticky;
  top: 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.lesson-sidebar-course-title {
  display: block;
  padding: .75rem 1rem;
  font-weight: 600;
  font-size: .9rem;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
.lesson-sidebar-course-title:hover { color: var(--accent-primary); }

.lesson-list {
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}

.lesson-list-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .55rem 1rem;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: .82rem;
  border-bottom: 1px solid var(--border);
  transition: background .12s;
}
.lesson-list-item:hover { background: var(--bg-elevated); color: var(--text-primary); }
.lesson-list-item--active {
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-weight: 600;
  border-inline-end: 3px solid var(--accent-primary);
}
.lesson-list-item--locked {
  cursor: not-allowed;
  opacity: .45;
  pointer-events: none;
}

.lesson-list-icon { flex-shrink: 0; width: 18px; text-align: center; }
.lesson-list-title { flex-grow: 1; line-height: 1.3; }
.lesson-list-dur { flex-shrink: 0; font-size: .75rem; opacity: .7; }

/* Main content area */
.lesson-main { flex-grow: 1; min-width: 0; }

/* 16:9 responsive player */
.lesson-player {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 10px;
}
.lesson-player iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

/* Placeholder when not configured */
.lesson-player-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 260px;
  border-radius: 10px;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border);
}

/* Mobile: collapse sidebar */
@media (max-width: 767px) {
  .lesson-layout { flex-direction: column; }
  .lesson-sidebar { width: 100%; }
  .lesson-sidebar-inner { position: static; }
  .lesson-list { max-height: 240px; }
}

/* ==========================================================================
   Lesson quiz
   ========================================================================== */
.quiz-option {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition: border-color .15s, background .15s;
}
.quiz-option:hover { border-color: var(--accent-primary); }
.quiz-option:has(input:checked) {
  border-color: var(--accent-primary);
  background: color-mix(in srgb, var(--accent-primary) 12%, var(--bg-elevated));
}
.quiz-already-done { opacity: .75; }

/* ==========================================================================
   Course completion certificate
   ========================================================================== */
.certificate-card {
  width: min(700px, 100%);
  background: var(--bg-surface);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border), 0 8px 40px rgba(0,0,0,.4);
}

.certificate-border {
  border: 6px solid transparent;
  background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
              linear-gradient(135deg, #d4af37, #f5e17a, #d4af37) border-box;
  border-radius: 12px;
  padding: 3rem 2.5rem;
  text-align: center;
}

.certificate-logo { margin-bottom: 1rem; opacity: .8; }

.certificate-label {
  font-size: 1rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #d4af37;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.certificate-awarded-to {
  color: var(--text-secondary);
  font-size: .9rem;
  margin-bottom: .25rem;
}

.certificate-name {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.certificate-text {
  color: var(--text-secondary);
  font-size: .9rem;
  margin-bottom: .4rem;
}

.certificate-course {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.certificate-divider {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #d4af37, transparent);
  margin: 0 auto 1.25rem;
}

.certificate-date {
  color: var(--text-secondary);
  font-size: .9rem;
  margin-bottom: .5rem;
}

.certificate-id {
  font-size: .75rem;
  color: var(--text-secondary);
  opacity: .6;
  margin: 0;
}
.certificate-id code {
  font-size: .7rem;
  letter-spacing: .03em;
}

/* Print: light background for physical printing */
@media print {
  body { background: #fff !important; color: #000 !important; }
  .certificate-border {
    background: #fff;
    border: 6px solid #d4af37;
    color: #000;
  }
  .certificate-label { color: #b8860b; }
  .certificate-name, .certificate-course { color: #111; }
  .certificate-awarded-to, .certificate-text, .certificate-date, .certificate-id { color: #444; }
  nav, .lesson-sidebar, .d-flex.gap-3.mt-4 { display: none !important; }
}

a { color: #2c6e49; }

/* Community (EPIC-6.1/6.2): post bodies inside cards keep card padding only */
.card-surface .lesson-notes { padding: 0; }