@import url('https://fonts.googleapis.com/css2?family=Syne:wght@700;800&family=Outfit:wght@400;500;600;700&display=swap');

:root {
  --bg: #030912;
  --bg2: #060f1e;
  --surface: #091526;
  --card: #0c1a2e;
  --card2: #101f38;
  --border: #142440;
  --border2: #1c3358;
  --blue: #3b82f6;
  --blue-bright: #60a5fa;
  --blue-dim: #1d4ed8;
  --cyan: #22d3ee;
  --cyan-dim: #0891b2;
  --purple: #818cf8;
  --green: #34d399;
  --amber: #fbbf24;
  --orange: #fb923c;
  --red: #f87171;
  --text: #dce8f8;
  --text2: #7ea0c8;
  --text3: #3d5a7a;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-xl: 26px;
  --shell: min(92vw, 1200px);
  --header-h: 64px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --t: 200ms;
  --shadow: 0 4px 24px rgba(0,0,0,0.45), 0 0 0 1px rgba(255,255,255,0.03);
  --glow-blue: 0 0 40px rgba(59,130,246,0.2);
  --glow-cyan: 0 0 40px rgba(34,211,238,0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 15% 5%, rgba(59,130,246,0.07) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 85% 95%, rgba(34,211,238,0.05) 0%, transparent 55%);
  pointer-events: none;
  z-index: 0;
}

h1,h2,h3,h4 { font-family: 'Syne', sans-serif; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.9rem, 4vw, 3.2rem); font-weight: 800; }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.9rem); font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 700; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: 'Outfit', sans-serif; }

.shell { width: var(--shell); margin: 0 auto; padding: 0 1.5rem; }

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(3,9,18,0.88);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--border);
}

.header-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-logo { width: 34px; height: 34px; }

.brand-name {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex: 1;
}

.site-nav a {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.865rem;
  font-weight: 500;
  color: var(--text2);
  transition: color var(--t) var(--ease), background var(--t) var(--ease);
  white-space: nowrap;
}

.site-nav a:hover, .site-nav a[aria-current="page"] {
  color: var(--text);
  background: rgba(59,130,246,0.1);
}

.header-search-wrap {
  position: relative;
  flex-shrink: 0;
}

.header-search-wrap input {
  width: 210px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.45rem 1rem 0.45rem 2.2rem;
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  color: var(--text);
  outline: none;
  transition: border-color var(--t), box-shadow var(--t), width var(--t) var(--ease);
}

.header-search-wrap input::placeholder { color: var(--text3); }
.header-search-wrap input:focus {
  border-color: var(--blue);
  width: 260px;
  box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.header-search-icon {
  position: absolute;
  left: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text3);
  font-size: 0.95rem;
  pointer-events: none;
}

.header-search-results {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 340px;
  background: var(--card2);
  border: 1px solid var(--border2);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), var(--glow-blue);
  z-index: 200;
  display: none;
  overflow: hidden;
  animation: fadeSlideDown 150ms var(--ease);
}
.header-search-results.open { display: block; }

.nav-toggle {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
}

/* ===== SEARCH HERO ===== */
.search-hero {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 5rem 1.5rem 3.5rem;
  gap: 1.75rem;
}

.hero-logo {
  width: 82px;
  height: 82px;
  animation: float 7s ease-in-out infinite;
  filter: drop-shadow(0 0 20px rgba(59,130,246,0.35));
}

@keyframes float {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}

.hero-copy { max-width: 680px; }
.hero-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.6rem;
}

.hero-copy h1 {
  background: linear-gradient(135deg, var(--text) 35%, var(--blue-bright) 80%, var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.hero-copy p {
  font-size: 1rem;
  color: var(--text2);
}

/* ===== MAIN SEARCH BAR ===== */
.main-search-wrap {
  position: relative;
  width: 100%;
  max-width: 660px;
}

.main-search {
  position: relative;
}

.main-search input {
  width: 100%;
  background: var(--card2);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius-xl);
  padding: 1.05rem 5rem 1.05rem 3.4rem;
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  color: var(--text);
  outline: none;
  transition: border-color 200ms, box-shadow 200ms;
}

.main-search input::placeholder { color: var(--text3); }
.main-search input:focus {
  border-color: var(--blue);
  box-shadow: var(--glow-blue), 0 0 0 1px rgba(59,130,246,0.08) inset;
}

.main-search-icon {
  position: absolute;
  left: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--blue);
  font-size: 1.2rem;
  pointer-events: none;
}

.main-search-clear {
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text2);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  transition: all var(--t);
}
.main-search-clear.visible { display: flex; }
.main-search-clear:hover { background: rgba(59,130,246,0.15); color: var(--blue-bright); }

/* Main search results dropdown */
.main-search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 64px rgba(0,0,0,0.55), var(--glow-blue);
  z-index: 50;
  display: none;
  overflow: hidden;
  animation: fadeSlideDown 150ms var(--ease);
}
.main-search-results.open { display: block; }

@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.search-group-label {
  padding: 0.55rem 1rem 0.25rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text3);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.search-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  cursor: pointer;
  transition: background var(--t);
  border-bottom: 1px solid rgba(255,255,255,0.02);
}
.search-item:hover, .search-item.active { background: rgba(59,130,246,0.08); }

.search-item-icon {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.search-item-body { flex: 1; min-width: 0; }
.search-item-name { font-size: 0.875rem; font-weight: 600; color: var(--text); }
.search-item-sub { font-size: 0.75rem; color: var(--text2); }

.search-item-arrow {
  color: var(--text3);
  font-size: 0.8rem;
  flex-shrink: 0;
}

/* Game result with category chips */
.search-game-block {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.search-game-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}
.search-game-head-icon {
  width: 28px; height: 28px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
}
.search-game-head-name { font-size: 0.85rem; font-weight: 700; color: var(--text); }

.search-cat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.search-cat-chip {
  padding: 0.28rem 0.65rem;
  border-radius: 20px;
  background: var(--surface);
  border: 1px solid var(--border2);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text2);
  cursor: pointer;
  transition: all var(--t);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.search-cat-chip:hover {
  background: rgba(59,130,246,0.14);
  color: var(--blue-bright);
  border-color: var(--blue-dim);
}

/* Hint chips */
.search-hints {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
}
.hint-chip {
  padding: 0.32rem 0.75rem;
  border-radius: 20px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text2);
  cursor: pointer;
  transition: all var(--t);
}
.hint-chip:hover {
  background: rgba(59,130,246,0.1);
  border-color: var(--blue-dim);
  color: var(--blue-bright);
}

/* ===== FEATURED GAMES SECTION ===== */
.section {
  position: relative;
  z-index: 1;
  padding: 0 0 5rem;
}

.section-head {
  text-align: center;
  margin-bottom: 2.25rem;
}

.eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}

.game-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.5rem;
  cursor: pointer;
  transition: transform var(--t) var(--ease), border-color var(--t), box-shadow var(--t);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  display: block;
}

.game-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.game-card.teal::before { background: linear-gradient(90deg, #3b82f6, #22d3ee); }
.game-card.gold::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.game-card.indigo::before { background: linear-gradient(90deg, #818cf8, #a78bfa); }

.game-card:hover {
  transform: translateY(-5px);
  border-color: var(--border2);
  box-shadow: var(--shadow), 0 0 40px rgba(59,130,246,0.1);
}

.game-card-badge {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.22rem 0.55rem;
  border-radius: 20px;
  background: rgba(59,130,246,0.12);
  color: var(--blue-bright);
  display: inline-block;
  margin-bottom: 0.7rem;
}

.game-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.45rem;
  color: var(--text);
}

.game-card p {
  font-size: 0.85rem;
  color: var(--text2);
  line-height: 1.6;
  margin-bottom: 0.9rem;
}

.chip-row { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 1.1rem; }
.chip {
  padding: 0.18rem 0.5rem;
  border-radius: 20px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  font-size: 0.7rem;
  color: var(--text3);
}

.card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-bright);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap var(--t);
}
.card-link::after { content: '→'; }
.game-card:hover .card-link { gap: 0.5rem; }

/* ===== DRILL-DOWN PAGES ===== */
.drilldown-page {
  position: relative;
  z-index: 1;
  padding: 1.5rem 0 5rem;
  min-height: 70vh;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
}

.bc-item {
  font-size: 0.82rem;
  color: var(--text3);
  cursor: pointer;
  transition: color var(--t);
  white-space: nowrap;
}
.bc-item:hover { color: var(--blue-bright); }
.bc-item.current { color: var(--text); cursor: default; }
.bc-sep { color: var(--text3); font-size: 0.7rem; }

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 500;
  transition: all var(--t);
  margin-bottom: 1.4rem;
}
.back-btn:hover {
  background: rgba(59,130,246,0.1);
  border-color: var(--blue-dim);
  color: var(--blue-bright);
}

.view-title {
  margin-bottom: 0.4rem;
}
.view-subtitle {
  font-size: 0.9rem;
  color: var(--text2);
  margin-bottom: 1.75rem;
}

/* ===== CATEGORY TILES ===== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 1rem;
}

.cat-tile {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem 1.5rem;
  cursor: pointer;
  transition: all var(--t) var(--ease);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cat-tile::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 30%, rgba(59,130,246,0.07), transparent 65%);
  opacity: 0;
  transition: opacity var(--t);
}
.cat-tile:hover {
  transform: translateY(-5px);
  border-color: var(--border2);
  box-shadow: var(--glow-blue);
}
.cat-tile:hover::after { opacity: 1; }

.cat-icon { font-size: 2.4rem; margin-bottom: 0.7rem; display: block; }
.cat-name {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}
.cat-count { font-size: 0.75rem; color: var(--text3); }

/* ===== LEVELS LIST ===== */
.levels-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.4rem;
  flex-wrap: wrap;
}

.tier-filters {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.tier-pill {
  padding: 0.32rem 0.85rem;
  border-radius: 20px;
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--text2);
  font-size: 0.78rem;
  font-weight: 600;
  transition: all var(--t);
}
.tier-pill:hover, .tier-pill.on { background: rgba(59,130,246,0.14); border-color: var(--blue-dim); color: var(--blue-bright); }
.tier-pill.on.beg { background: rgba(52,211,153,0.1); border-color: #10b981; color: #34d399; }
.tier-pill.on.int { background: rgba(251,191,36,0.1); border-color: #d97706; color: #fbbf24; }
.tier-pill.on.adv { background: rgba(251,146,60,0.1); border-color: #ea580c; color: #fb923c; }
.tier-pill.on.exp { background: rgba(248,113,113,0.1); border-color: #dc2626; color: #f87171; }

.levels-search-field {
  position: relative;
  flex: 1;
  max-width: 280px;
}
.levels-search-field input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.45rem 1rem 0.45rem 2.1rem;
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  color: var(--text);
  outline: none;
  transition: border-color var(--t);
}
.levels-search-field input::placeholder { color: var(--text3); }
.levels-search-field input:focus { border-color: var(--blue); }
.levels-search-icon {
  position: absolute;
  left: 0.65rem; top: 50%;
  transform: translateY(-50%);
  color: var(--text3); font-size: 0.85rem; pointer-events: none;
}

.level-count-label {
  font-size: 0.8rem;
  color: var(--text3);
  margin-left: auto;
}

.levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.7rem;
}

.level-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  cursor: pointer;
  transition: all var(--t) var(--ease);
}
.level-card:hover {
  transform: translateY(-3px);
  border-color: var(--border2);
  background: var(--card2);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.level-card-name {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.tier-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.14rem 0.48rem;
  border-radius: 20px;
  display: inline-block;
}
.tier-beginner { background: rgba(52,211,153,0.1); color: #34d399; }
.tier-intermediate { background: rgba(251,191,36,0.1); color: #fbbf24; }
.tier-advanced { background: rgba(251,146,60,0.1); color: #fb923c; }
.tier-expert { background: rgba(248,113,113,0.1); color: #f87171; }

/* ===== DIFFICULTY GRID ===== */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 640px;
}

.diff-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  cursor: pointer;
  transition: all var(--t) var(--ease);
  text-align: center;
}
.diff-card:hover { transform: translateY(-5px); }
.diff-card.easy:hover { border-color: #10b981; box-shadow: 0 0 30px rgba(52,211,153,0.15); }
.diff-card.medium:hover { border-color: #d97706; box-shadow: 0 0 30px rgba(251,191,36,0.15); }
.diff-card.hard:hover { border-color: #dc2626; box-shadow: 0 0 30px rgba(248,113,113,0.15); }

.diff-icon { font-size: 2.4rem; margin-bottom: 0.6rem; display: block; }
.diff-label {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}
.diff-card.easy .diff-label { color: #34d399; }
.diff-card.medium .diff-label { color: #fbbf24; }
.diff-card.hard .diff-label { color: #f87171; }
.diff-modes { font-size: 0.75rem; color: var(--text3); line-height: 1.5; }

/* ===== MODE BUTTONS ===== */
.modes-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  max-width: 700px;
}

.mode-btn {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1.4rem;
  cursor: pointer;
  transition: all var(--t) var(--ease);
  text-align: left;
}
.mode-btn:hover {
  background: rgba(59,130,246,0.1);
  border-color: var(--blue-dim);
  transform: translateY(-2px);
  color: var(--blue-bright);
}
.mode-btn-name { font-weight: 600; font-size: 0.875rem; display: block; color: var(--text); }
.mode-btn-hint { font-size: 0.73rem; color: var(--text3); display: block; margin-top: 0.18rem; }
.mode-btn:hover .mode-btn-name { color: var(--blue-bright); }

/* ===== TUTORIAL PANEL ===== */
.tutorial-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1.25rem;
  align-items: start;
}

.tutorial-main {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.tutorial-header {
  background: linear-gradient(135deg, rgba(59,130,246,0.14), rgba(34,211,238,0.07));
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 1.6rem;
}
.tutorial-header h2 { font-size: 1.3rem; margin-bottom: 0.2rem; }
.tutorial-header p { font-size: 0.85rem; color: var(--text2); }

.tutorial-body { padding: 1.4rem 1.6rem; }

.t-section { margin-bottom: 1.4rem; }
.t-section:last-child { margin-bottom: 0; }

.t-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-bright);
  margin-bottom: 0.55rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.t-text { font-size: 0.875rem; color: var(--text2); line-height: 1.7; }

.tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.tag-tower {
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  color: var(--blue-bright);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
}
.tag-danger {
  background: rgba(248,113,113,0.1);
  border: 1px solid rgba(248,113,113,0.2);
  color: #f87171;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
}

/* Tutorial sidebar */
.tutorial-sidebar { display: flex; flex-direction: column; gap: 1rem; }

.video-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: block;
  text-decoration: none;
  transition: all var(--t) var(--ease);
}
.video-card:hover { border-color: var(--border2); transform: translateY(-3px); box-shadow: var(--shadow); }

.video-thumb {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #0a1828, #0f2240);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.video-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 35% 40%, rgba(59,130,246,0.18), transparent 60%);
}

.video-play {
  width: 50px; height: 50px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  border: 2px solid rgba(255,255,255,0.18);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  position: relative; z-index: 1;
  transition: all var(--t) var(--ease);
}
.video-card:hover .video-play { background: rgba(220,20,20,0.75); border-color: rgba(220,20,20,0.5); transform: scale(1.1); }

.video-info { padding: 0.9rem 1rem; }
.video-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #f87171;
  margin-bottom: 0.3rem;
  display: block;
}
.video-title { font-size: 0.84rem; font-weight: 600; color: var(--text); line-height: 1.4; }

.hero-rec-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.2rem;
}
.hero-rec-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 0.55rem;
  display: block;
}
.hero-rec-name {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--cyan);
  margin-bottom: 0.2rem;
}
.hero-rec-tip { font-size: 0.8rem; color: var(--text2); line-height: 1.55; }

/* ===== PAGE HERO (subpages) ===== */
.page-hero {
  padding: 3.25rem 0 2.75rem;
  position: relative;
  z-index: 1;
}
.page-hero-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.65rem;
}
.page-hero h1 { margin-bottom: 0.6rem; }
.page-hero p { font-size: 1rem; color: var(--text2); max-width: 620px; }

/* ===== INFO CARDS (lane/article grids) ===== */
.lane-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.lane-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.lane-card h3 { font-size: 0.95rem; margin-bottom: 0.35rem; color: var(--text); }
.lane-card p { font-size: 0.825rem; color: var(--text2); }

.panel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.75rem; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem; }
.panel h2 { margin-bottom: 0.5rem; }
.panel p { font-size: 0.875rem; color: var(--text2); margin-bottom: 1rem; }

/* ===== METRIC GRID ===== */
.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: 1rem;
}
.metric-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
}
.metric-card strong { display: block; font-family: 'Syne', sans-serif; font-size: 1.4rem; font-weight: 800; color: var(--blue-bright); }
.metric-card span { font-size: 0.75rem; color: var(--text3); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.6rem 1.3rem;
  border-radius: var(--radius); border: none;
  font-family: 'Outfit', sans-serif; font-size: 0.875rem; font-weight: 600;
  cursor: pointer; transition: all var(--t) var(--ease); text-decoration: none;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-bright); box-shadow: 0 0 20px rgba(59,130,246,0.4); transform: translateY(-1px); }
.btn-secondary { background: var(--surface); border: 1px solid var(--border2); color: var(--text2); }
.btn-secondary:hover { background: rgba(59,130,246,0.08); border-color: var(--blue-dim); color: var(--blue-bright); }

/* ===== 404 ===== */
.not-found {
  min-height: 80vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 3rem 1.5rem;
  position: relative; z-index: 1;
}
.not-found-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 3rem;
  max-width: 480px;
}
.not-found-code {
  font-family: 'Syne', sans-serif;
  font-size: 6rem; font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1; margin-bottom: 1rem;
}
.not-found-card h1 { font-size: 1.5rem; margin-bottom: 0.65rem; }
.not-found-card p { color: var(--text2); font-size: 0.9rem; margin-bottom: 1.5rem; }

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
  position: relative; z-index: 1;
}
.footer-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.footer-row p { font-size: 0.8rem; color: var(--text3); }

/* ===== ANIM HELPERS ===== */
.hidden { display: none !important; }
.view-in { animation: viewIn 180ms var(--ease); }
@keyframes viewIn {
  from { opacity: 0; transform: translateX(8px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 960px) {
  .games-grid { grid-template-columns: 1fr; }
  .tutorial-layout { grid-template-columns: 1fr; }
  .diff-grid { max-width: 100%; }
  .panel-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .site-nav.open {
    display: flex; flex-direction: column;
    position: fixed; inset: var(--header-h) 0 0 0;
    background: var(--bg); padding: 1.5rem; z-index: 99; gap: 0.4rem;
  }
  .site-nav.open a { padding: 0.9rem 1rem; font-size: 1rem; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: block; }
  .header-search-wrap { display: none; }
  .search-hero { padding: 3rem 1.5rem 2.5rem; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .levels-grid { grid-template-columns: repeat(2, 1fr); }
  .diff-grid { grid-template-columns: 1fr; max-width: 300px; }
  .lane-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .categories-grid { grid-template-columns: 1fr; }
  .levels-grid { grid-template-columns: 1fr; }
}