/* CYBERXCELLENCE — Design System v2 */

/* ── Theme tokens ── */
:root,
[data-theme="dark"] {
  --bg: #0b0f14;
  --bg-elevated: #131922;
  --bg-card: #161d28;
  --bg-card-hover: #1a2230;
  --bg-strip: #0a1320;
  --ink: #f5f7fa;
  --ink-soft: #9aa5b8;
  --ink-mute: #5d6878;
  --line: #232c3a;
  --line-strong: #2d3848;
  --accent: #62d39c;
  --accent-soft: rgba(98, 211, 156, 0.12);
  --accent-glow: rgba(98, 211, 156, 0.25);
  --accent-ink: #0b0f14;
  --gold: #d4a857;
  --gold-soft: rgba(212, 168, 87, 0.12);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.4);
  color-scheme: dark;
  /* backward-compat aliases for existing component CSS */
  --green: #62d39c;
  --green-dark: #3aaa74;
  --green-soft: rgba(98, 211, 156, 0.12);
  --bg-soft: #131922;
  --text: #f5f7fa;
  --muted: #9aa5b8;
  --border: #232c3a;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  --warn: #f59e0b;
  --danger: #ef4444;
}

[data-theme="light"] {
  --bg: #fafbfc;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f7f8fa;
  --bg-strip: #0a1320;
  --ink: #0a1628;
  --ink-soft: #4b5563;
  --ink-mute: #8b96a8;
  --line: #e4e8ee;
  --line-strong: #cdd4de;
  --accent: #2f8d46;
  --accent-soft: rgba(47, 141, 70, 0.08);
  --accent-glow: rgba(47, 141, 70, 0.2);
  --accent-ink: #ffffff;
  --gold: #b08a3e;
  --gold-soft: rgba(176, 138, 62, 0.1);
  --shadow-card: 0 2px 8px rgba(10, 22, 40, 0.06);
  --shadow-hover: 0 8px 24px rgba(10, 22, 40, 0.1);
  color-scheme: light;
  /* backward-compat aliases */
  --green: #2f8d46;
  --green-dark: #1f6a32;
  --green-soft: rgba(47, 141, 70, 0.08);
  --bg-soft: #ffffff;
  --text: #0a1628;
  --muted: #4b5563;
  --border: #e4e8ee;
  --shadow: 0 2px 8px rgba(10, 22, 40, 0.06);
  --warn: #d97706;
  --danger: #dc2626;
}

/* ── Reset ── */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { transition: background-color 0.3s ease, color 0.3s ease; }
body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
}
[data-theme="dark"] body::before {
  content: '';
  position: fixed;
  top: -50%; left: -20%;
  width: 70%; height: 100%;
  background: radial-gradient(circle at center, rgba(98, 211, 156, 0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: none; }
h1, h2, h3 { font-family: 'IBM Plex Serif', serif; color: var(--ink); }

/* ── Layout ── */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 40px;
  position: relative;
  z-index: 1;
}

/* ── Top strip ── */
.top-strip {
  background: var(--bg-strip);
  color: #fff;
  padding: 8px 0;
  font-size: 13px;
  text-align: center;
  position: relative;
  z-index: 10;
}
.top-strip a { color: var(--accent); margin-left: 8px; font-weight: 600; }
.top-strip a:hover { text-decoration: underline; }

/* ── Navbar ── */
.navbar {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
[data-theme="dark"] .navbar { background: rgba(11, 15, 20, 0.85); }
[data-theme="light"] .navbar { background: rgba(250, 251, 252, 0.9); }

.nav-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.logo {
  font-family: 'IBM Plex Serif', serif;
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo em { font-style: italic; font-weight: 500; color: var(--accent); }
.logo-mark {
  width: 32px; height: 32px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
/* legacy brand */
.brand { font-family: 'IBM Plex Serif', serif; font-weight: 700; color: var(--accent); font-size: 18px; }

.nav-links { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
.nav-links a { color: var(--ink-soft); font-size: 14px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }

.btn-link {
  background: none; border: none; cursor: pointer;
  font-size: 14px; font-weight: 500; font-family: inherit;
  color: var(--ink-soft); padding: 0; transition: color 0.2s;
}
.btn-link:hover { color: var(--ink); }

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--line);
  width: 38px; height: 38px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--ink-soft);
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

.nav-cta {
  background: var(--accent);
  color: var(--accent-ink) !important;
  padding: 10px 22px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 24px var(--accent-glow); text-decoration: none; }

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--accent-ink) !important;
  padding: 11px 24px;
  border-radius: 100px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.25s;
  text-decoration: none;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px var(--accent-glow); text-decoration: none; }

.btn-outline {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--ink) !important;
  padding: 10px 20px;
  border-radius: 100px;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-outline:hover { border-color: var(--ink-soft); background: var(--bg-card-hover); text-decoration: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  padding: 11px 24px;
  font-weight: 500;
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
  background: transparent;
  cursor: pointer;
  text-decoration: none;
}
.btn-secondary:hover { border-color: var(--ink-soft); background: var(--bg-card-hover); text-decoration: none; }

.btn-danger {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--danger) !important;
  padding: 10px 20px;
  border-radius: 100px;
  border: 1px solid var(--danger);
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-danger:hover { background: rgba(239, 68, 68, 0.08); text-decoration: none; }

.btn-sm { padding: 6px 14px !important; font-size: 12px !important; }

.btn-mark-read {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  border-radius: 100px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}
.btn-mark-read:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 8px 20px var(--accent-glow); }
.btn-mark-read.done { background: var(--ink-mute); cursor: default; color: var(--bg); }

/* ── Messages ── */
.messages { max-width: 1320px; margin: 16px auto 0; padding: 0 40px; }
.message {
  padding: 12px 16px; border-radius: 8px; margin-bottom: 8px;
  background: var(--accent-soft); border-left: 4px solid var(--accent);
  color: var(--ink); font-size: 14px;
}
.message.error { background: rgba(239, 68, 68, 0.1); border-color: var(--danger); }
.message.warning { background: rgba(245, 158, 11, 0.1); border-color: var(--warn); }

/* ── Utilities ── */
.muted, .text-muted { color: var(--ink-soft); }

.badge { display: inline-block; padding: 3px 10px; border-radius: 100px; font-size: 12px; font-weight: 600; }
.badge-new { background: rgba(245, 158, 11, 0.15); color: var(--warn); }
.badge-contacted { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.badge-closed { background: var(--bg-elevated); color: var(--ink-soft); border: 1px solid var(--line); }

/* ── Section layout ── */
.section {
  padding: 80px 40px 100px;
  max-width: 1320px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.section-head h2 {
  font-family: 'IBM Plex Serif', serif;
  font-weight: 600; font-size: 36px;
  letter-spacing: -0.02em; color: var(--ink);
}
.section-head h2 em { font-style: italic; font-weight: 500; color: var(--accent); }
.section-head .meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; color: var(--ink-soft);
  font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em;
}
.section-title {
  font-family: 'IBM Plex Serif', serif;
  font-size: 26px; font-weight: 600;
  letter-spacing: -0.01em;
  margin: 20px 0;
  color: var(--ink);
}

/* ── Filters ── */
.filters {
  display: flex; gap: 4px;
  background: var(--bg-elevated);
  padding: 4px; border-radius: 100px;
  border: 1px solid var(--line);
  margin-bottom: 32px; width: fit-content;
}
.filter-chip {
  padding: 8px 18px; border: none;
  background: transparent; color: var(--ink-soft);
  font-size: 13px; font-weight: 500;
  font-family: inherit; cursor: pointer;
  border-radius: 100px; transition: all 0.2s;
}
.filter-chip.active { background: var(--ink); color: var(--bg); }
.filter-chip:hover:not(.active) { color: var(--ink); }

/* ── Hero ── */
.hero {
  padding: 80px 40px 100px;
  max-width: 1320px; margin: 0 auto;
  display: grid; grid-template-columns: 1.3fr 1fr;
  gap: 64px; align-items: center;
  position: relative; z-index: 1;
}
.hero-left { display: flex; flex-direction: column; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 24px;
  padding: 6px 14px;
  background: var(--accent-soft); border: 1px solid var(--accent-soft);
  border-radius: 100px; align-self: flex-start;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px;
  background: var(--accent); border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
  animation: hero-pulse 2s infinite;
}
@keyframes hero-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero h1 {
  font-family: 'IBM Plex Serif', serif;
  font-weight: 600; font-size: 56px;
  line-height: 1.08; letter-spacing: -0.02em;
  margin-bottom: 24px; color: var(--ink);
}
.hero h1 em { font-style: italic; font-weight: 500; color: var(--accent); }
.hero p { font-size: 18px; color: var(--ink-soft); margin-bottom: 36px; max-width: 540px; line-height: 1.65; }
.hero-ctas { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 40px; }
.btn-secondary {
  color: var(--ink); padding: 14px 24px;
  font-weight: 500; border: 1px solid var(--line-strong);
  border-radius: 100px; font-size: 15px;
  transition: all 0.2s; display: inline-block;
}
.btn-secondary:hover { border-color: var(--ink-soft); background: var(--bg-card-hover); text-decoration: none; }
.hero-trust {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; padding-top: 32px;
  border-top: 1px solid var(--line);
}
.trust-item { display: flex; flex-direction: column; gap: 4px; }
.trust-item .v {
  font-family: 'IBM Plex Serif', serif;
  font-size: 28px; font-weight: 600;
  color: var(--ink); letter-spacing: -0.01em; line-height: 1;
}
.trust-item .v em { font-style: italic; color: var(--accent); font-weight: 500; }
.trust-item .l {
  font-size: 11px; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: 0.08em;
  font-weight: 500; margin-top: 6px;
}
/* Hero visual card */
.hero-visual {
  position: relative; aspect-ratio: 4/5;
  border-radius: 24px;
  background: linear-gradient(135deg, #1a2230 0%, #0a1320 100%);
  overflow: hidden; box-shadow: var(--shadow-hover);
  border: 1px solid var(--line);
}
[data-theme="light"] .hero-visual { background: linear-gradient(135deg, #1e3a5f 0%, #0a1628 100%); }
.hero-visual::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 25% 30%, rgba(98,211,156,0.18) 0%, transparent 55%),
    radial-gradient(circle at 80% 75%, rgba(212,168,87,0.1) 0%, transparent 50%);
}
.hero-visual::after {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(98,211,156,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(98,211,156,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}
.hero-visual-content {
  position: absolute; inset: 0; padding: 36px; color: white;
  display: flex; flex-direction: column;
  justify-content: space-between; z-index: 2;
}
.glyph {
  width: 72px; height: 72px;
  border: 1px solid rgba(98,211,156,0.4);
  background: rgba(98,211,156,0.08);
  border-radius: 18px; display: flex;
  align-items: center; justify-content: center;
  font-family: 'IBM Plex Serif', serif;
  font-size: 36px; font-style: italic;
  color: var(--accent);
}
.hero-visual-stat { display: flex; flex-direction: column; gap: 6px; }
.hero-visual-stat .num {
  font-family: 'IBM Plex Serif', serif;
  font-size: 64px; font-weight: 500;
  line-height: 0.95; letter-spacing: -0.02em; color: white;
}
.hero-visual-stat .num em { font-style: italic; color: var(--accent); }
.hero-visual-stat .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.12em; color: rgba(255,255,255,0.6);
}
.hero-visual-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--accent);
  padding: 4px 10px;
  background: rgba(98,211,156,0.15);
  border-radius: 100px; align-self: flex-start;
}

/* ── Course grids ── */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ── Course card ── */
.course-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  display: block;
  color: inherit;
  transition: all 0.3s;
  box-shadow: var(--shadow-card);
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
  text-decoration: none;
}
.course-cover {
  height: 160px;
  background: linear-gradient(135deg, #1a2230 0%, #0a1320 100%);
  background-size: cover; background-position: center;
  position: relative; overflow: hidden;
}
.course-cover::after {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 30%, var(--accent-soft) 0%, transparent 55%),
    radial-gradient(circle at 75% 75%, var(--gold-soft) 0%, transparent 50%);
}
.course-image {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, #1a2230 0%, #0a1320 100%);
  position: relative; overflow: hidden;
}
.course-image::after {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 30%, var(--accent-soft) 0%, transparent 55%),
    radial-gradient(circle at 75% 75%, var(--gold-soft) 0%, transparent 50%);
}
.course-image-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(98, 211, 156, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(98, 211, 156, 0.05) 1px, transparent 1px);
  background-size: 28px 28px; z-index: 1;
}
.course-image-label {
  position: absolute; top: 16px; left: 16px;
  padding: 6px 14px; border-radius: 100px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  background: var(--accent); color: var(--accent-ink); z-index: 2;
}
.course-image-label.soon {
  background: rgba(11, 15, 20, 0.7);
  color: var(--gold); border: 1px solid var(--gold);
  backdrop-filter: blur(10px);
}
.course-image-glyph {
  position: absolute; bottom: 20px; right: 20px; z-index: 2;
  font-family: 'IBM Plex Serif', serif;
  font-size: 56px; font-style: italic;
  color: var(--accent); opacity: 0.7; line-height: 1;
}
.badge-rating, .badge-free {
  position: absolute; top: 10px; right: 10px;
  background: rgba(0, 0, 0, 0.6); color: #fff;
  padding: 4px 10px; border-radius: 100px; font-size: 12px; z-index: 2;
}
.badge-free { background: var(--accent); color: var(--accent-ink); right: auto; left: 10px; }

.course-card-body { padding: 20px; }
.course-body { padding: 24px; }
.course-cat {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--ink-mute);
  font-weight: 600; margin-bottom: 10px;
}
.course-card-body h3, .course-card h3 {
  font-family: 'IBM Plex Serif', serif;
  font-weight: 600; font-size: 22px;
  letter-spacing: -0.01em; margin: 0 0 12px;
  line-height: 1.25; color: var(--ink);
}
.course-card p { font-size: 14px; color: var(--ink-soft); margin-bottom: 16px; line-height: 1.6; }
.course-card-body .level { font-size: 13px; color: var(--ink-soft); margin: 6px 0; }

.card-footer {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-top: 14px; margin-top: 14px;
}
.card-footer .explore { color: var(--accent); font-weight: 600; }
.course-meta {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 20px; border-top: 1px solid var(--line);
}
.course-meta .price {
  font-family: 'IBM Plex Serif', serif;
  font-size: 22px; font-weight: 600; color: var(--ink);
}
.course-meta .price.free { color: var(--accent); font-style: italic; }
.course-meta .level {
  font-family: 'JetBrains Mono', monospace;
  color: var(--ink-soft); font-size: 11px;
  font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em;
}

/* ── Course detail hero ── */
.course-hero {
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 36px; border-radius: 14px;
  margin-bottom: 28px; box-shadow: var(--shadow-card);
}
.course-hero h1 { margin: 0 0 10px; font-size: 32px; }
.course-hero .lead { color: var(--ink-soft); font-size: 16px; }
.course-hero .meta { margin-top: 14px; display: flex; gap: 16px; color: var(--ink-soft); font-size: 14px; }
.enroll-area { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Resources page ── */
.resources-header {
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 28px 36px; border-radius: 14px;
  margin-bottom: 24px; box-shadow: var(--shadow-card);
}
.resources-header h1 { margin: 0 0 8px; font-size: 24px; }
.progress-line { margin: 6px 0; font-size: 14px; }
.progress-bar {
  width: 100%; height: 6px;
  background: var(--line); border-radius: 3px; overflow: hidden; margin-top: 10px;
}
.progress-fill { height: 100%; background: var(--accent); transition: width 0.3s; border-radius: 3px; }
.hint { font-size: 12px; color: var(--ink-mute); margin-top: 8px; }

.tabs { display: flex; gap: 24px; padding: 12px 0; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.tab { font-size: 13px; color: var(--ink-mute); font-weight: 600; letter-spacing: 0.04em; cursor: pointer; padding: 6px 0; }
.tab.active { color: var(--accent); border-bottom: 2px solid var(--accent); }

.weeks-accordion, .weeks-preview { display: flex; flex-direction: column; gap: 12px; }
.week-block, .week-row {
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg-card); overflow: hidden;
  box-shadow: var(--shadow-card); transition: border-color 0.2s;
}
.week-block:hover, .week-row:hover { border-color: var(--line-strong); }
.week-block > summary, .week-row > summary {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px; cursor: pointer;
  list-style: none; font-size: 15px; font-weight: 500; color: var(--ink);
}
.week-block > summary::-webkit-details-marker,
.week-row > summary::-webkit-details-marker { display: none; }

.week-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 50%; font-size: 13px; font-weight: 700;
  flex-shrink: 0; font-family: 'JetBrains Mono', monospace;
}
.topic-count { margin-left: auto; font-size: 13px; color: var(--ink-mute); }

.days-list { padding: 8px 20px 20px; }
.day-row {
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 14px 16px; border: 1px solid var(--line);
  border-radius: 8px; margin-top: 8px;
  background: var(--bg-elevated); color: inherit; transition: all 0.2s;
}
.day-row:hover { background: var(--bg-card-hover); border-color: var(--line-strong); text-decoration: none; }
.day-info { display: flex; align-items: center; gap: 14px; }
.play-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: var(--accent-soft); border-radius: 8px;
  color: var(--accent); font-size: 12px; flex-shrink: 0;
}
.day-meta { display: flex; gap: 12px; font-size: 12px; color: var(--ink-mute); margin-top: 4px; }
.day-actions { display: flex; align-items: center; gap: 12px; }
.progress-pill {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 50%;
  border: 2px solid var(--accent);
  font-size: 11px; font-weight: 700; color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}
.btn-action { padding: 8px 18px; border-radius: 100px; font-size: 13px; font-weight: 600; transition: all 0.2s; }
.btn-start { background: var(--accent); color: var(--accent-ink); }
.btn-resume { background: var(--warn); color: #fff; }
.btn-completed { background: var(--accent-soft); color: var(--accent); border: 1px solid var(--accent); }

/* ── Lesson layout ── */
.lesson-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}
@media (max-width: 800px) { .lesson-layout { grid-template-columns: 1fr; } }

.lesson-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px; padding: 18px;
  height: fit-content; position: sticky;
  top: 90px; box-shadow: var(--shadow-card);
}
.lesson-sidebar h3 { margin: 0 0 12px; font-size: 14px; font-family: 'IBM Plex Sans', sans-serif; font-weight: 600; }
.articles-list { display: flex; flex-direction: column; gap: 2px; }

.sidebar-item {
  display: flex; justify-content: space-between;
  align-items: flex-start; padding: 10px 12px;
  border-radius: 6px; color: inherit; font-size: 13px; transition: background 0.15s;
}
.sidebar-item:hover { background: var(--bg-elevated); text-decoration: none; }
.sidebar-item.active {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
}
.sidebar-item .title { font-weight: 600; color: var(--ink); line-height: 1.4; }
.sidebar-item .updated { font-size: 11px; color: var(--ink-mute); margin-top: 3px; }
.sidebar-item .check { color: var(--accent); font-weight: 700; flex-shrink: 0; }

.lesson-body {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px; padding: 32px;
  box-shadow: var(--shadow-card);
}
.lesson-toolbar {
  display: flex; justify-content: space-between;
  align-items: flex-start; margin-bottom: 24px;
  gap: 12px; flex-wrap: wrap;
}
.lesson-toolbar h1 { margin: 0; font-size: 24px; line-height: 1.3; }
.nav-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.lesson-video { margin: 20px 0; }
.lesson-video iframe { width: 100%; aspect-ratio: 16/9; border: 0; border-radius: 8px; }

/* ── Prose ── */
.prose { line-height: 1.75; color: var(--ink); }
.prose h2, .prose h3 { font-family: 'IBM Plex Serif', serif; margin-top: 28px; margin-bottom: 12px; }
.prose p { margin-bottom: 16px; }
.prose ul, .prose ol { padding-left: 20px; margin-bottom: 16px; }
.prose li { margin-bottom: 6px; }
.prose pre {
  background: var(--bg-elevated); border: 1px solid var(--line);
  padding: 16px; overflow-x: auto; border-radius: 8px; margin-bottom: 16px;
}
.prose pre code { background: none; border: none; padding: 0; font-size: 13px; }
.prose code {
  background: var(--bg-elevated); border: 1px solid var(--line);
  padding: 2px 6px; border-radius: 4px;
  font-size: 13px; font-family: 'JetBrains Mono', monospace;
}
.prose img { max-width: 100%; height: auto; border-radius: 8px; }
.prose blockquote {
  margin: 16px 0; padding: 12px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 8px 8px 0;
}

code {
  background: var(--bg-elevated); border: 1px solid var(--line);
  padding: 2px 6px; border-radius: 4px;
  font-size: 12px; font-family: 'JetBrains Mono', monospace;
}
blockquote {
  margin: 16px 0; padding: 12px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 8px 8px 0;
}

.mark-read-wrap {
  display: flex; justify-content: flex-end;
  margin-top: 36px; padding-top: 24px;
  border-top: 1px solid var(--line);
}

/* ── Quiz ── */
.sidebar-tabs { display: flex; gap: 6px; margin: 8px 0 16px; }
.sidebar-tab {
  padding: 5px 14px; border-radius: 100px;
  font-size: 12px; font-weight: 600;
  background: var(--bg-elevated); color: var(--ink-mute);
  text-decoration: none; border: 1px solid var(--line); transition: all 0.15s;
}
.sidebar-tab.active, .sidebar-tab:hover {
  background: var(--accent); color: var(--accent-ink); border-color: var(--accent);
}

.quiz-sidebar-nav { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.quiz-box {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 6px;
  font-size: 13px; font-weight: 600; text-decoration: none;
  border: 2px solid transparent; transition: opacity 0.15s;
  font-family: 'JetBrains Mono', monospace;
}
.quiz-box.unanswered { background: var(--bg-elevated); color: var(--ink); border-color: var(--line); }
.quiz-box.correct    { background: rgba(34, 197, 94, 0.15); color: #22c55e; border-color: rgba(34, 197, 94, 0.4); }
.quiz-box.wrong      { background: rgba(239, 68, 68, 0.15); color: #ef4444; border-color: rgba(239, 68, 68, 0.4); }
.quiz-box.current    { border-color: #3b82f6; box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3); }
.quiz-box:hover      { opacity: 0.75; }

.quiz-question-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 700; letter-spacing: 0.08em;
  color: var(--ink-mute); margin: 0 0 14px; text-transform: uppercase;
}
.quiz-question-panel {
  background: var(--bg-elevated); border: 1px solid var(--line);
  border-radius: 8px; padding: 20px 24px;
  font-size: 16px; font-weight: 500; line-height: 1.65;
  margin-bottom: 20px; color: var(--ink);
}
.quiz-choices { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 20px; }
@media (max-width: 600px) { .quiz-choices { grid-template-columns: 1fr; } }

.quiz-choice-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border: 2px solid var(--line);
  border-radius: 8px; cursor: pointer;
  background: var(--bg-card); font-size: 14px; line-height: 1.5;
  transition: border-color 0.15s, background 0.15s;
  user-select: none; color: var(--ink);
}
.quiz-choice-card:hover:not(.locked) { border-color: #3b82f6; background: rgba(59, 130, 246, 0.08); }
.quiz-choice-card.selected { border-color: #3b82f6; background: rgba(59, 130, 246, 0.1); }
.quiz-choice-card.correct  { border-color: #22c55e; background: rgba(34, 197, 94, 0.08); }
.quiz-choice-card.wrong    { border-color: #ef4444; background: rgba(239, 68, 68, 0.08); }
.quiz-choice-card.locked   { cursor: default; }
.quiz-radio { flex-shrink: 0; accent-color: #3b82f6; width: 16px; height: 16px; }

.quiz-feedback { padding: 12px 16px; border-radius: 8px; font-weight: 600; font-size: 14px; margin-bottom: 14px; }
.quiz-feedback.correct { background: rgba(34, 197, 94, 0.1); color: #22c55e; border: 1px solid rgba(34, 197, 94, 0.3); }
.quiz-feedback.wrong   { background: rgba(239, 68, 68, 0.1); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.3); }

.quiz-explanation {
  background: var(--bg-elevated); border: 1px solid var(--line);
  border-left: 4px solid var(--ink-mute); border-radius: 6px;
  padding: 14px 16px; font-size: 14px; line-height: 1.65;
  color: var(--ink-soft); margin-bottom: 20px;
}
.quiz-actions {
  display: flex; justify-content: space-between; align-items: center;
  gap: 8px; margin: 20px 0; flex-wrap: wrap;
}
.quiz-actions-left, .quiz-actions-right { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.quiz-status-bar {
  display: flex; gap: 24px; align-items: center;
  padding: 14px 0; border-top: 1px solid var(--line);
  margin-top: 4px; flex-wrap: wrap;
}
.status-item { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--ink); }
.status-sq { width: 14px; height: 14px; border-radius: 3px; flex-shrink: 0; }
.status-sq.correct    { background: #22c55e; }
.status-sq.wrong      { background: #ef4444; }
.status-sq.unanswered { background: transparent; border: 2px solid var(--ink-mute); }

.result-summary {
  text-align: center; padding: 36px 28px;
  border-radius: 12px; margin-bottom: 32px; border: 1px solid;
}
.result-summary.pass { background: rgba(34, 197, 94, 0.08); border-color: rgba(34, 197, 94, 0.3); }
.result-summary.fail { background: rgba(239, 68, 68, 0.08); border-color: rgba(239, 68, 68, 0.3); }
.result-score {
  font-family: 'IBM Plex Serif', serif;
  font-size: 56px; font-weight: 700; margin: 0 0 8px; line-height: 1;
}
.result-summary.pass .result-score { color: #22c55e; }
.result-summary.fail .result-score { color: #ef4444; }
.result-verdict { font-size: 18px; font-weight: 600; margin: 4px 0 8px; }
.result-verdict.pass { color: #22c55e; }
.result-verdict.fail { color: #ef4444; }

.responses { display: flex; flex-direction: column; gap: 16px; }
.response-card {
  border: 1px solid var(--line); border-radius: 10px;
  padding: 20px; background: var(--bg-card); border-left-width: 4px;
}
.response-card.correct { border-left-color: #22c55e; }
.response-card.wrong   { border-left-color: #ef4444; }
.response-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.response-num {
  background: var(--bg-elevated); color: var(--ink);
  font-weight: 700; font-size: 12px;
  padding: 2px 8px; border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
}
.response-status { font-size: 13px; font-weight: 600; }
.response-status.correct { color: #22c55e; }
.response-status.wrong   { color: #ef4444; }
.response-question { font-weight: 500; margin: 0 0 8px; font-size: 15px; color: var(--ink); }
.response-answer  { margin: 0 0 4px; font-size: 14px; color: var(--ink-soft); }
.response-correct { margin: 0 0 8px; font-size: 14px; color: #22c55e; font-weight: 500; }
.ai-output { margin-top: 10px; font-size: 14px; line-height: 1.6; }
.ai-explanation {
  background: var(--bg-elevated); padding: 12px 14px;
  border-radius: 6px; border-left: 3px solid var(--ink-mute);
}

/* ── Auth + form cards ── */
.auth-card, .form-card, .checkout {
  max-width: 520px; margin: 40px auto;
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: 14px; padding: 36px; box-shadow: var(--shadow-card);
}
.auth-card h1, .checkout h1 { margin-top: 0; }
.form-card { max-width: 700px; }
.form-card-wide { max-width: 100%; }

input[type="text"], input[type="email"], input[type="password"],
input[type="number"], input[type="tel"], input[type="url"], textarea, select {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: inherit;
  background: var(--bg-elevated); color: var(--ink);
  transition: border-color 0.2s;
}
input:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--accent);
}

.form-actions {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-top: 20px; padding-top: 20px;
  border-top: 1px solid var(--line);
}

/* ── Checkout ── */
.price-box {
  display: flex; gap: 32px; padding: 18px;
  background: var(--bg-elevated); border-radius: 10px;
  margin-bottom: 24px; border: 1px solid var(--line);
}
.payment-options { display: grid; gap: 12px; }
.payment-option {
  padding: 18px; border: 1px solid var(--line);
  border-radius: 10px; display: flex;
  justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px;
  background: var(--bg-card); transition: border-color 0.2s;
}
.payment-option:hover { border-color: var(--line-strong); }
.payment-option h3 { margin: 0 0 4px; font-size: 15px; }
.payment-option p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.bank-details {
  background: var(--bg-elevated); border: 1px solid var(--line);
  padding: 16px; border-radius: 8px; margin: 16px 0;
  font-family: 'JetBrains Mono', monospace; font-size: 13px;
}

/* ── Instructor dashboard ── */
.instructor-layout {
  display: grid; grid-template-columns: 220px 1fr;
  gap: 24px; min-height: calc(100vh - 120px);
}
@media (max-width: 800px) { .instructor-layout { grid-template-columns: 1fr; } }

.instructor-sidebar {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: 10px; padding: 20px;
  height: fit-content; box-shadow: var(--shadow-card);
}
.instructor-sidebar h3 {
  margin: 0 0 16px; font-size: 11px;
  color: var(--ink-mute); text-transform: uppercase;
  letter-spacing: 0.1em; font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
}
.instructor-sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.instructor-sidebar nav a {
  padding: 9px 12px; border-radius: 6px;
  color: var(--ink-soft); font-size: 14px; font-weight: 500; transition: all 0.15s;
}
.instructor-sidebar nav a:hover {
  background: var(--accent-soft); color: var(--accent); text-decoration: none;
}
.instructor-sidebar hr { border: 0; border-top: 1px solid var(--line); margin: 12px 0; }
.instructor-main h1 { margin-top: 0; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; margin-bottom: 28px; }
.stat-card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: 10px; padding: 20px; text-align: center; box-shadow: var(--shadow-card);
}
.stat-card h2 {
  margin: 0; font-size: 32px;
  font-family: 'IBM Plex Serif', serif;
  color: var(--accent); letter-spacing: -0.02em;
}
.stat-card p { margin: 6px 0 0; font-size: 12px; color: var(--ink-mute); text-transform: uppercase; letter-spacing: 0.06em; }

.dash-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 800px) { .dash-cols { grid-template-columns: 1fr; } }

.data-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: 10px; overflow: hidden;
  margin-top: 10px; margin-bottom: 20px;
}
.data-table th, .data-table td {
  text-align: left; padding: 12px 14px;
  font-size: 13px; border-bottom: 1px solid var(--line);
}
.data-table th {
  background: var(--bg-elevated); font-weight: 600; color: var(--ink-soft);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--bg-elevated); }

.filter-bar { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.filter-bar input { flex: 1; min-width: 180px; }
.pager { display: flex; gap: 12px; align-items: center; margin-top: 14px; font-size: 14px; }

.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.page-header h1 { margin: 0; font-size: 28px; }

.course-block { background: var(--bg-card); padding: 20px; border: 1px solid var(--line); border-radius: 10px; margin: 20px 0; }

.content-tree { background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; margin-top: 28px; }
.tree-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.tree-header h2 { margin: 0; font-size: 20px; }
.tree-item { border: 1px solid var(--line); border-radius: 8px; padding: 14px; margin-bottom: 12px; background: var(--bg-elevated); }
.tree-item-header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 10px; flex-wrap: wrap; gap: 8px; }
.tree-item-header > div:last-child { display: flex; gap: 6px; }
.tree-subitem {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px; background: var(--bg-card);
  border: 1px solid var(--line); border-radius: 6px;
  margin-top: 6px; font-size: 14px;
}
.tree-empty, .empty-state {
  padding: 24px; background: var(--bg-elevated);
  border: 1px dashed var(--line); border-radius: 8px;
  text-align: center; color: var(--ink-mute);
}
.choices-grid { display: flex; flex-direction: column; gap: 8px; margin: 16px 0; }
.choice-row {
  display: grid; grid-template-columns: 1fr auto auto;
  gap: 12px; align-items: center; padding: 10px;
  background: var(--bg-elevated); border-radius: 6px; border: 1px solid var(--line);
}
.choice-text input { width: 100%; }
.choice-correct, .choice-delete { display: flex; align-items: center; gap: 4px; font-size: 13px; white-space: nowrap; }

/* ── Breadcrumb ── */
.breadcrumb { font-size: 13px; color: var(--ink-mute); margin-bottom: 12px; }
.breadcrumb a { color: var(--accent); }
.breadcrumb a:hover { text-decoration: underline; }

/* ── Carousel ── */
.carousel {
  max-width: 720px; margin: 0 auto 28px;
  background: var(--bg-elevated); border: 1px solid var(--line);
  border-radius: 10px; padding: 24px 20px 14px; text-align: center;
}
.carousel-slides { position: relative; min-height: 80px; }
.carousel .carousel-slides .carousel-slide { display: none; }
.carousel .carousel-slides .carousel-slide.active { display: block; }
.carousel-slide img { max-width: 100%; height: auto; display: block; margin: 0 auto; border-radius: 6px; }
.carousel-caption { color: var(--ink-mute); font-size: 14px; margin: 10px 0 0; }
.carousel-controls {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--line);
}
.carousel-controls-nav { display: flex; gap: 6px; align-items: center; }
.carousel-btn {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: 6px; padding: 6px 14px; cursor: pointer;
  font-size: 16px; color: var(--ink); line-height: 1; transition: all 0.15s;
}
.carousel-btn:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.carousel-indicator { font-size: 13px; color: var(--ink-mute); font-weight: 500; font-family: 'JetBrains Mono', monospace; }

/* ── Expandable video ── */
video.expandable-video {
  max-width: 400px; width: 100%; display: block;
  margin: 12px auto; transition: max-width 0.35s ease;
  border-radius: 8px; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
video.expandable-video.is-playing { max-width: 800px; }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: 40px 0 32px; margin-top: 80px;
  position: relative; z-index: 1;
}
.footer-inner {
  max-width: 1320px; margin: 0 auto; padding: 0 40px;
  display: flex; justify-content: space-between;
  align-items: center; flex-wrap: wrap; gap: 24px;
}
.footer-left { font-size: 13px; color: var(--ink-soft); }
.footer-left a { color: var(--ink); font-weight: 500; }
.footer-links { display: flex; gap: 28px; font-size: 13px; color: var(--ink-soft); }
.footer-links a:hover { color: var(--accent); }
.site-footer {
  border-top: 1px solid var(--line); margin-top: 60px;
  padding: 32px 40px; text-align: center;
  color: var(--ink-mute); font-size: 13px;
}

/* ── Curriculum days (detail page) ── */
.curriculum-days { list-style: none; margin: 0; padding: 0; }
.curriculum-days li { border-bottom: 1px solid var(--line); }
.curriculum-days li:last-child { border-bottom: none; }
.curriculum-days a { display: block; padding: 10px 16px; color: var(--ink-soft); text-decoration: none; transition: all 0.15s; }
.curriculum-days a:hover { background: var(--bg-elevated); color: var(--ink); }
.curriculum-days .no-articles { display: block; padding: 10px 16px; color: var(--ink-mute); font-size: 0.9em; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .container { padding: 24px; }
  .courses-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 60px 24px 80px; }
  .hero { grid-template-columns: 1fr; padding: 60px 24px 80px; gap: 40px; }
  .hero h1 { font-size: 42px; }
  .hero-visual { aspect-ratio: 16/10; }
  .hero-trust { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 640px) {
  .nav-inner { padding: 0 20px; gap: 12px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .theme-toggle { display: inline-flex; }
  .container { padding: 20px; }
  .courses-grid, .course-grid { grid-template-columns: 1fr; }
  .section { padding: 48px 20px 60px; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .section-head h2 { font-size: 28px; }
  .top-strip { font-size: 12px; padding: 6px 16px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; padding: 0 20px; }
  .messages { padding: 0 20px; }
  .hero { padding: 48px 20px 60px; }
  .hero h1 { font-size: 34px; }
  .hero-trust { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .hero-visual { display: none; }
}