@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inconsolata:wght@500&display=swap');

:root {
  --bg: #f7f4ec;
  --bg-accent: linear-gradient(180deg, #f7f4ec 0%, #f0efe6 100%);
  --surface: #ffffff;
  --muted: #64748b;
  --text: #0f172a;
  --border: #e2e8f0;
  --accent: #f97316;
  --accent-strong: #ea580c;
  --sticker-off: #d6d6dc;
  --sticker-on: #facc15;
  --shadow: 0 10px 40px rgba(15, 23, 42, 0.08);
}

body.theme-dark {
  --bg: #0c1220;
  --bg-accent: radial-gradient(circle at 10% 10%, rgba(252, 211, 77, 0.1), rgba(12, 18, 32, 0.2) 30%), #0c1220;
  --surface: #10182b;
  --muted: #cbd5e1;
  --text: #e2e8f0;
  --border: #1e293b;
  --accent: #fb923c;
  --accent-strong: #f97316;
  --sticker-off: #2b3244;
  --sticker-on: #facc15;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Space Grotesk', 'Segoe UI', sans-serif;
  background: var(--bg-accent);
  color: var(--text);
  min-height: 100vh;
}

main {
  display: block;
}

.page-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px clamp(18px, 3vw, 36px) 64px;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px clamp(18px, 3vw, 36px);
  max-width: 1100px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
}

.nav-links {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 10px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 50px rgba(15, 23, 42, 0.14);
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
  padding: 46px 0;
}

.page-hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 26px;
  align-items: center;
  padding: 28px 0 12px;
}

.hero-panel {
  background: radial-gradient(circle at 18% 20%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 36%),
    radial-gradient(circle at 80% 10%, color-mix(in srgb, var(--accent-strong) 16%, transparent), transparent 34%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: clamp(18px, 4vw, 28px);
  box-shadow: var(--shadow);
  display: grid;
  gap: 12px;
}

.hero-panel h1 {
  margin: 6px 0 8px;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.08;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--text);
  font-weight: 700;
  border: 1px solid var(--border);
}

.pill strong {
  font-weight: 800;
  letter-spacing: 0.02em;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 6px;
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.stat-value {
  font-size: 22px;
  font-weight: 800;
}

.section-block {
  margin: 18px 0 0;
  display: grid;
  gap: 12px;
}

.section-block .section-title {
  margin: 0;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

.tile-card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 14px;
  padding: 14px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 6px;
  position: relative;
}

.tile-card .eyebrow {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tile-card h3 {
  margin: 0;
}

.tile-card p {
  margin: 0;
  color: var(--muted);
}

.tile-card a {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.timeline {
  display: grid;
  gap: 10px;
}

.timeline-step {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.timeline-step strong {
  font-size: 15px;
}

.tag-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 13px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.callout {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.drill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.drill-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
  display: grid;
  gap: 6px;
}

.drill-card h4 {
  margin: 0;
}

.drill-card p {
  margin: 0;
  color: var(--muted);
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.checklist li {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.simple-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.note {
  color: var(--muted);
  font-size: 14px;
}

.hero-card h3 {
  margin: 0 0 6px;
}

.hero-card ul {
  margin: 0;
  padding-left: 16px;
  color: var(--muted);
}

.f2l-lab {
  display: grid;
  gap: 14px;
}

.lab-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 14px;
  align-items: start;
}

.board-wrap {
  display: grid;
  gap: 10px;
}

.control-stack {
  display: grid;
  gap: 10px;
}

.muted {
  color: var(--muted);
}

.hero-card,
.surface-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: clamp(18px, 3vw, 28px);
  box-shadow: var(--shadow);
}

.hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.1;
  margin: 0 0 12px;
}

.hero p,
.lead {
  color: var(--muted);
  margin: 0 0 18px;
  font-size: 17px;
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0f172a;
  box-shadow: var(--shadow);
}

.btn-ghost {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn:hover {
  transform: translateY(-1px);
}

.section-title {
  margin: 36px 0 12px;
  font-size: 20px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.feature h3 {
  margin: 6px 0 8px;
  font-size: 17px;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.oll-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.oll-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.oll-board {
  display: grid;
  grid-template-columns: repeat(5, minmax(48px, 68px));
  grid-template-rows: repeat(5, minmax(36px, 68px));
  gap: 10px;
  justify-content: center;
  align-items: center;
  place-items: center;
  margin: 8px 0 0;
}

.oll-board > * {
  display: flex;
  align-items: center;
  justify-content: center;
}

.sticker {
  display: block;
  margin: auto;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: var(--sticker-off);
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.2s ease, box-shadow 0.2s ease;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.sticker.static {
  pointer-events: none;
}

.sticker:hover {
  transform: translateY(-1px) scale(1.01);
}

.sticker.top {
  width: 88%;
  aspect-ratio: 1 / 1;
}

.sticker.ring {
  width: 88%;
  height: 60%;
  aspect-ratio: auto;
}

.sticker.ring.vertical {
  width: 60%;
  height: 88%;
  aspect-ratio: auto;
}

.sticker.active {
  background: var(--sticker-on);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent);
}

.color-red { background: #ef4444 !important; }
.color-green { background: #22c55e !important; }
.color-blue { background: #3b82f6 !important; }
.color-orange { background: #f97316 !important; }

.sticker.disabled {
  pointer-events: none;
  background: color-mix(in srgb, var(--sticker-on) 70%, #ffffff 20%);
  border-style: dashed;
}

.placeholder {
  visibility: hidden;
}

.result {
  display: grid;
  gap: 6px;
  color: var(--text);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
}

.f2l-layout {
  display: grid;
  gap: 18px;
}

.f2l-intro {
  display: grid;
  gap: 10px;
}

.f2l-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  grid-template-rows: auto auto;
  gap: 12px;
}

.f2l-board .face {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
  background: var(--surface);
}

.face-top {
  background: linear-gradient(180deg, #fde047, #fbbf24);
  grid-column: 1 / -1;
}

.face-front {
  background: linear-gradient(180deg, #ef4444, #dc2626);
}

.face-right {
  background: linear-gradient(180deg, #3b82f6, #2563eb);
}

.face-label {
  position: absolute;
  top: 8px;
  left: 10px;
  padding: 6px 10px;
  background: rgba(0, 0, 0, 0.18);
  color: #fff;
  border-radius: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.piece {
  position: absolute;
  width: 22px;
  height: 22px;
  transform: translate(-50%, -50%);
  border: 2px solid #fef9c3;
  background: #facc15;
  color: #0f172a;
  font-weight: 800;
  display: grid;
  place-items: center;
  border-radius: 6px;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.piece.corner {
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.piece.edge {
  border-radius: 4px;
}

.piece:hover {
  transform: translate(-50%, -50%) scale(1.05);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.18);
}

.piece.is-active {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 35%, transparent);
}

.f2l-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  align-items: start;
}

.control-group {
  display: grid;
  gap: 8px;
}

.control-title {
  font-weight: 700;
}

.control-hint {
  color: var(--muted);
  font-size: 14px;
}

.control-group.actions {
  grid-column: 1 / -1;
}

.result small {
  color: var(--muted);
}

.status {
  font-family: 'Inconsolata', monospace;
  padding: 10px 12px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px dashed var(--border);
}

.code-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  font-family: 'Inconsolata', monospace;
}

.match-layout {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.match-text {
  display: grid;
  gap: 6px;
}

.timer-shell {
  display: grid;
  gap: 14px;
}

.timer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: start;
}

.timer-panel {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}

.scramble-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-family: 'Inconsolata', monospace;
}

.timer-display {
  font-family: 'Inconsolata', monospace;
  font-size: clamp(60px, 10vw, 110px);
  text-align: center;
  padding: 24px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  box-shadow: var(--shadow);
}

.timer-instruction {
  color: var(--muted);
  font-size: 15px;
  margin: 8px 0 0;
}

.timer-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.timer-stats {
  display: grid;
  gap: 12px;
}

.times-list {
  display: grid;
  gap: 8px;
}

.time-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.time-meta {
  color: var(--muted);
  font-size: 13px;
}

.time-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.time-actions button {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
}

.time-actions button.active {
  background: color-mix(in srgb, var(--accent) 24%, transparent);
}

.timer-graph {
  width: 100%;
  height: 220px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.graph-empty {
  display: grid;
  place-items: center;
  color: var(--muted);
  height: 100%;
  font-size: 14px;
}

.mini-board {
  display: grid;
  grid-template-columns: repeat(5, 16px);
  grid-template-rows: repeat(5, 16px);
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.mini-cell {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--sticker-off);
  border: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  justify-self: center;
  align-self: center;
}

.mini-cell.ring {
  width: 18px;
  height: 12px;
}

.mini-cell.ring.vertical {
  width: 12px;
  height: 18px;
}

.mini-cell.color-red { background: #ef4444; }
.mini-cell.color-green { background: #22c55e; }
.mini-cell.color-blue { background: #3b82f6; }
.mini-cell.color-orange { background: #f97316; }

.mini-cell.active {
  background: var(--sticker-on);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
}

footer {
  margin-top: 36px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .page-hero {
    grid-template-columns: 1fr;
  }

  .lab-grid {
    grid-template-columns: 1fr;
  }

  .timer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .oll-board {
    grid-template-columns: repeat(5, minmax(44px, 56px));
    grid-template-rows: repeat(5, minmax(32px, 56px));
    gap: 8px;
  }

  .sticker {
    border-radius: 8px;
  }
}

/* 3D Cube Styles */
.scene {
  width: 280px;
  height: 280px;
  perspective: 1000px;
  margin: 20px auto;
}

.cube {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(-25deg) rotateY(-45deg);
  pointer-events: none;
}

.cube-face {
  position: absolute;
  width: 180px;
  height: 180px;
  background: #1e293b;
  border: 4px solid #1e293b;
  border-radius: 4px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  left: 50px;
  top: 50px;
  pointer-events: auto;
}

.face-u {
  transform: rotateX(90deg) translateZ(90px);
}

.face-f {
  transform: rotateY(0deg) translateZ(90px);
}

.face-r {
  transform: rotateY(90deg) translateZ(90px);
}

.sticker {
  width: 100%;
  height: 100%;
  background-color: var(--sticker-off);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  pointer-events: auto;
  touch-action: manipulation;
}

.sticker:hover {
  filter: brightness(1.1);
  transform: scale(0.95);
}

.sticker.yellow { background-color: #facc15; }
.sticker.red { background-color: #ef4444; }
.sticker.blue { background-color: #3b82f6; }
.sticker.white { background-color: #ffffff; }

/* Highlight selected pieces */
.sticker.is-selected {
  box-shadow: inset 0 0 0 3px rgba(0,0,0,0.3);
  z-index: 2;
}

.sticker.is-target {
  animation: pulse-sticker 2s infinite;
}

@keyframes pulse-sticker {
  0% { transform: scale(1); }
  50% { transform: scale(0.92); }
  100% { transform: scale(1); }
}


.sticker.orange { background-color: #f97316; }
.sticker.green { background-color: #22c55e; }


.face-d {
  transform: rotateX(-90deg) translateZ(90px);
}

.face-l {
  transform: rotateY(-90deg) translateZ(90px);
}

.face-b {
  transform: rotateY(180deg) translateZ(90px);
}


/* Animation Cube 3D Styles */
#anim-cube {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 20px auto;
  transform-style: preserve-3d;
  transform: rotateX(-25deg) rotateY(-45deg);
  transition: transform 0.3s ease;
}

.cubie {
  position: absolute;
  width: 50px;
  height: 50px;
  transform-style: preserve-3d;
  /* transform-origin is critical for group rotation. 
     Instead of setting it here, we rely on the trick of 
     using a pivot or ensuring the translate matches the origin. 
     We'll center the cube at 0,0,0 so rotation works naturally. */
  top: 50%;
  left: 50%;
  margin-top: -25px; /* Center 0,0 */
  margin-left: -25px;
}

.cubie .face {
  position: absolute;
  width: 50px;
  height: 50px;
  border: 1.5px solid #000;
  border-radius: 4px;
  background: #000; /* Internal plastic color */
  box-sizing: border-box;
  backface-visibility: hidden;
}

/* Face transforms */
.cubie .face-u { transform: rotateX(90deg) translateZ(25px); }
.cubie .face-d { transform: rotateX(-90deg) translateZ(25px); }
.cubie .face-f { transform: translateZ(25px); }
.cubie .face-b { transform: rotateY(180deg) translateZ(25px); }
.cubie .face-r { transform: rotateY(90deg) translateZ(25px); }
.cubie .face-l { transform: rotateY(-90deg) translateZ(25px); }

/* Sticker Colors - Override defaults */
.cubie .face.sticker {
  /* Class 'sticker' added by JS + color class */
}
.cubie .face.white { background-color: #ffffff; }
.cubie .face.yellow { background-color: #facc15; }
.cubie .face.green { background-color: #22c55e; }
.cubie .face.blue { background-color: #3b82f6; }
.cubie .face.red { background-color: #ef4444; }
.cubie .face.orange { background-color: #f97316; }
.cubie .face.center { 
  /* Center stickers often have logo? Or just distinct styling if needed */
}