/* ─── Reset & Base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0b;
  --bg2: #111114;
  --bg3: #18181c;
  --card: #141417;
  --card-hover: #1c1c21;
  --border: #2a2a30;
  --border-light: #333339;
  --orange: #f97316;
  --orange-dim: #c05a0e;
  --orange-glow: rgba(249, 115, 22, 0.15);
  --orange-glow2: rgba(249, 115, 22, 0.08);
  --text: #e8e8ec;
  --text2: #a0a0ac;
  --text3: #666672;
  --green: #22c55e;
  --blue: #60a5fa;
  --purple: #a78bfa;
  --yellow: #fbbf24;
  --red: #f87171;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', 'Menlo', monospace;
  --radius: 10px;
  --radius-sm: 6px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

/* ─── Topnav ────────────────────────────────────────────────────── */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 28px;
  height: 56px;
}

.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.logo-cc { color: var(--orange); }
.logo-course { color: var(--text2); font-weight: 400; }

.nav-links {
  display: flex;
  gap: 4px;
}
.nav-module {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text3);
  transition: all 0.15s;
}
.nav-module:hover { color: var(--orange); background: var(--orange-glow2); }
.nav-module.active { color: var(--orange); background: var(--orange-glow); }

.nav-progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}
.nav-progress-label { font-size: 12px; color: var(--text3); white-space: nowrap; }
.nav-progress-bar {
  width: 100px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.nav-progress-fill {
  height: 100%;
  background: var(--orange);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* ─── Hero ──────────────────────────────────────────────────────── */
.hero {
  padding: 72px 28px 56px;
  text-align: center;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(249,115,22,0.06) 0%, transparent 70%);
}
.hero-inner { max-width: 700px; margin: 0 auto; }
.hero-eyebrow { color: var(--text3); font-size: 14px; margin-bottom: 16px; letter-spacing: 0.02em; }
.hero-title { font-size: clamp(36px, 6vw, 68px); font-weight: 900; line-height: 1.05; margin-bottom: 36px; }
.hero-num { color: var(--text); }
.hero-orange { color: var(--orange); }
.hero-white { color: var(--text); }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 36px;
}
.hero-stat { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.stat-val { font-size: 28px; font-weight: 800; color: var(--text); }
.stat-lbl { font-size: 12px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.08em; }

.overall-progress-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 400px;
  margin: 0 auto;
}
.overall-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.overall-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--orange-dim), var(--orange));
  border-radius: 3px;
  transition: width 0.5s ease;
}
.overall-progress-label { font-size: 13px; color: var(--text2); white-space: nowrap; }

/* ─── Module Cards Grid ─────────────────────────────────────────── */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px 48px;
}

.module-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, var(--orange-glow2) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.25s;
}
.module-card:hover {
  border-color: var(--orange-dim);
  background: var(--card-hover);
  transform: translateY(-2px);
}
.module-card:hover::before { opacity: 1; }

.card-track {
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-track svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-meta { display: flex; flex-direction: column; gap: 4px; }
.card-days { font-size: 13px; font-weight: 700; color: var(--orange); }
.card-title { font-size: 18px; font-weight: 700; color: var(--text); }
.card-count { font-size: 13px; color: var(--text3); }

.card-progress-bar {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.card-progress-fill {
  height: 100%;
  background: var(--orange);
  border-radius: 2px;
  transition: width 0.4s ease;
}
.card-progress-label { font-size: 11px; color: var(--text3); }

/* ─── Features Row ──────────────────────────────────────────────── */
.features-row {
  display: flex;
  justify-content: center;
  gap: 40px;
  padding: 0 28px 72px;
  flex-wrap: wrap;
}
.feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--text2);
}
.feature-dot { color: var(--orange); font-size: 12px; }

/* ─── Module Hero ───────────────────────────────────────────────── */
.module-hero {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 48px 28px 40px;
}
.module-hero-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  align-items: center;
}
.module-hero-track {
  width: 180px;
  height: 160px;
  flex-shrink: 0;
}
.module-hero-track svg { width: 100%; height: 100%; }

.module-eyebrow { font-size: 13px; color: var(--orange); font-weight: 600; margin-bottom: 8px; }
.module-hero-title { font-size: 42px; font-weight: 900; color: var(--text); margin-bottom: 8px; }
.module-tagline { font-size: 16px; color: var(--text2); margin-bottom: 24px; }

.module-progress-wrap { display: flex; align-items: center; gap: 12px; }
.module-progress-bar { flex: 1; max-width: 280px; height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.module-progress-fill { height: 100%; background: var(--orange); border-radius: 3px; transition: width 0.4s; }
.module-progress-label { font-size: 13px; color: var(--text2); }

/* ─── Lessons List ──────────────────────────────────────────────── */
.lessons-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 28px;
}
.lessons-heading {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}
.lessons-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  transition: all 0.15s;
}
.lesson-row:hover {
  border-color: var(--orange-dim);
  background: var(--card-hover);
}

.lesson-row-left { display: flex; align-items: flex-start; gap: 14px; flex: 1; min-width: 0; }
.lesson-day-badge {
  flex-shrink: 0;
  background: var(--orange-glow);
  color: var(--orange);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  margin-top: 2px;
}
.lesson-row-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.lesson-row-title { font-size: 15px; font-weight: 600; color: var(--text); }
.lesson-row-overview { font-size: 13px; color: var(--text2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.lesson-row-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.lesson-task-count { font-size: 12px; color: var(--text3); white-space: nowrap; }
.lesson-mini-bar { width: 60px; height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
.lesson-mini-fill { height: 100%; background: var(--orange); border-radius: 2px; transition: width 0.4s; }
.lesson-arrow { color: var(--text3); font-size: 20px; }

/* ─── Module Nav ────────────────────────────────────────────────── */
.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px 28px 56px;
  gap: 12px;
}
.module-nav-btn {
  font-size: 13px;
  color: var(--text2);
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  transition: all 0.15s;
}
.module-nav-btn:hover { border-color: var(--orange-dim); color: var(--orange); }
.module-nav-home {
  font-size: 13px;
  color: var(--text3);
  padding: 8px 14px;
  transition: color 0.15s;
}
.module-nav-home:hover { color: var(--text); }

/* ─── Lesson Header ─────────────────────────────────────────────── */
.lesson-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 36px 28px 32px;
}
.lesson-header-inner { max-width: 1200px; margin: 0 auto; }

.lesson-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text3);
  margin-bottom: 20px;
}
.lesson-breadcrumb a { color: var(--text3); transition: color 0.15s; }
.lesson-breadcrumb a:hover { color: var(--orange); }
.lesson-breadcrumb span { color: var(--border-light); }

.lesson-title-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
}
.lesson-day-tag {
  background: var(--orange-glow);
  color: var(--orange);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 5px;
  flex-shrink: 0;
}
.lesson-title { font-size: 28px; font-weight: 800; color: var(--text); }
.lesson-overview { font-size: 15px; color: var(--text2); max-width: 700px; margin-bottom: 20px; }

.lesson-header-progress { display: flex; align-items: center; gap: 12px; }
.lesson-hpbar { width: 200px; height: 5px; background: var(--border); border-radius: 3px; overflow: hidden; }
.lesson-hpfill { height: 100%; background: var(--orange); border-radius: 3px; transition: width 0.4s; }
.lesson-hplabel { font-size: 13px; color: var(--text2); }

/* ─── Lesson Body (2-col) ───────────────────────────────────────── */
.lesson-body {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 36px 28px;
  align-items: start;
}

/* ─── Content sections ──────────────────────────────────────────── */
.lesson-content { display: flex; flex-direction: column; gap: 32px; }

.section-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.section-text {
  font-size: 15px;
  color: var(--text2);
  line-height: 1.75;
}

.section-code-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 8px;
}
.code-block-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg3);
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
}
.code-lang {
  font-size: 11px;
  font-family: var(--mono);
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text3);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.15s;
}
.copy-btn:hover { color: var(--text); border-color: var(--text3); }
.copy-btn.copied { color: var(--green); border-color: var(--green); }

.code-block {
  background: #0d0d10;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0;
}
.code-block code {
  font-family: var(--mono);
  font-size: 13px;
  color: #c9d1d9;
  line-height: 1.65;
  white-space: pre;
}

.tip-box {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: rgba(251, 191, 36, 0.06);
  border: 1px solid rgba(251, 191, 36, 0.2);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.tip-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }
.tip-text { font-size: 14px; color: var(--text2); line-height: 1.65; }

/* ─── Tasks Sidebar ─────────────────────────────────────────────── */
.tasks-sidebar { position: sticky; top: 72px; }
.tasks-sidebar-inner {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tasks-header { display: flex; justify-content: space-between; align-items: center; }
.tasks-title { font-size: 16px; font-weight: 700; color: var(--text); }
.tasks-count { font-size: 13px; color: var(--text3); }

.tasks-progress-bar { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.tasks-progress-fill { height: 100%; background: var(--orange); border-radius: 2px; transition: width 0.3s; }

.tasks-list { display: flex; flex-direction: column; gap: 8px; }

.task-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.15s;
  overflow: hidden;
}
.task-item.done {
  background: rgba(34, 197, 94, 0.04);
  border-color: rgba(34, 197, 94, 0.2);
}
.task-item.done .task-title { text-decoration: line-through; color: var(--text3); }
.task-item.done .task-desc { color: var(--text3); opacity: 0.6; }

.task-label {
  display: flex;
  gap: 10px;
  padding: 12px;
  cursor: pointer;
  align-items: flex-start;
}

.task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-light);
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 1px;
  transition: all 0.15s;
  position: relative;
}
.task-checkbox:checked {
  background: var(--green);
  border-color: var(--green);
}
.task-checkbox:checked::after {
  content: '✓';
  position: absolute;
  color: #000;
  font-size: 11px;
  font-weight: 900;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.task-content { flex: 1; min-width: 0; }
.task-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; margin-bottom: 4px; }
.task-title { font-size: 13px; font-weight: 600; color: var(--text); line-height: 1.4; }
.task-desc { font-size: 12px; color: var(--text2); line-height: 1.5; }

.task-diff {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.task-diff-easy { background: rgba(34,197,94,0.1); color: var(--green); }
.task-diff-medium { background: rgba(251,191,36,0.1); color: var(--yellow); }
.task-diff-hard { background: rgba(248,113,113,0.1); color: var(--red); }

.reset-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text3);
  font-size: 12px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.15s;
  align-self: flex-start;
}
.reset-btn:hover { border-color: var(--red); color: var(--red); }

/* ─── Lesson Nav ────────────────────────────────────────────────── */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 28px 56px;
  gap: 12px;
}
.lesson-nav-btn {
  font-size: 13px;
  color: var(--text2);
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  transition: all 0.15s;
  max-width: 260px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lesson-nav-btn:hover { border-color: var(--orange-dim); color: var(--orange); }
.lesson-nav-next { text-align: right; }
.lesson-nav-up {
  font-size: 13px;
  color: var(--text3);
  padding: 9px 16px;
  transition: color 0.15s;
}
.lesson-nav-up:hover { color: var(--text); }

/* ─── Footer ────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 28px;
  text-align: center;
  font-size: 13px;
  color: var(--text3);
}

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .lesson-body {
    grid-template-columns: 1fr;
  }
  .tasks-sidebar {
    position: static;
  }
  .module-hero-inner {
    grid-template-columns: 1fr;
  }
  .module-hero-track {
    width: 120px;
    height: 100px;
    margin: 0 auto;
  }
}

/* ─── Catalog / Launcher Page ───────────────────────────────────── */
.catalog-hero {
  padding: 72px 28px 56px;
  text-align: center;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(249,115,22,0.05) 0%, transparent 70%);
}
.catalog-hero-inner { max-width: 600px; margin: 0 auto; }
.catalog-eyebrow { color: var(--text3); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 16px; }
.catalog-title { font-size: clamp(32px, 5vw, 56px); font-weight: 900; line-height: 1.1; margin-bottom: 16px; }
.catalog-title-accent { color: var(--orange); }
.catalog-sub { color: var(--text2); font-size: 16px; line-height: 1.6; }

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 28px 80px;
}

.catalog-card {
  display: grid;
  grid-template-columns: 56px 1fr 28px;
  align-items: center;
  gap: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}
.catalog-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 10% 50%, color-mix(in srgb, var(--course-accent) 10%, transparent) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.25s;
}
.catalog-card:hover {
  border-color: var(--course-accent, var(--orange-dim));
  background: var(--card-hover);
  transform: translateY(-2px);
}
.catalog-card:hover::before { opacity: 1; }

.catalog-card-icon {
  font-size: 32px;
  line-height: 1;
  flex-shrink: 0;
}

.catalog-card-body { min-width: 0; }
.catalog-card-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
}
.catalog-card-tagline {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.5;
  margin-bottom: 10px;
}
.catalog-card-stats {
  font-size: 12px;
  color: var(--course-accent, var(--orange));
  font-weight: 600;
  letter-spacing: 0.02em;
}

.catalog-card-arrow {
  font-size: 20px;
  color: var(--text3);
  flex-shrink: 0;
  transition: color 0.15s, transform 0.15s;
}
.catalog-card:hover .catalog-card-arrow {
  color: var(--course-accent, var(--orange));
  transform: translateX(3px);
}

@media (max-width: 600px) {
  .modules-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    gap: 24px;
  }
  .nav-progress-wrap {
    display: none;
  }
  .lesson-nav-btn {
    max-width: 140px;
    font-size: 12px;
  }
}