:root {
  color-scheme: light;
  --font-ui: "Avenir Next", "Segoe UI Variable", "Trebuchet MS", sans-serif;
  --page-bg: #eef2ea;
  --page-bg-top: #f8faf3;
  --page-bg-bottom: #dfe8d5;
  --page-ink: #15222f;
  --muted: #667785;
  --copy: #415362;
  --panel: rgba(255, 253, 249, 0.84);
  --panel-strong: rgba(255, 255, 255, 0.98);
  --line: rgba(21, 34, 47, 0.1);
  --line-strong: rgba(21, 34, 47, 0.16);
  --shadow: 0 28px 72px rgba(16, 28, 40, 0.12);
  --accent: #86e85c;
  --accent-strong: #4dbf51;
  --accent-ink: #12220f;
  --accent-soft: rgba(134, 232, 92, 0.18);
  --accent-border: rgba(134, 232, 92, 0.38);
  --accent-2: #5de8db;
  --accent-2-soft: rgba(93, 232, 219, 0.18);
  --hero-glow-a: rgba(134, 232, 92, 0.18);
  --hero-glow-b: rgba(93, 232, 219, 0.14);
  --hero-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(247, 250, 244, 0.9));
  --hero-copy-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(248, 252, 245, 0.9));
  --canvas-shell: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(250, 252, 249, 0.78));
  --canvas-border: rgba(255, 255, 255, 0.7);
  --tag-bg: rgba(255, 255, 255, 0.92);
  --tag-border: rgba(21, 34, 47, 0.1);
  --touch-columns: 4;
  --reveal-duration: 720ms;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  position: relative;
  overflow-x: hidden;
  font-family: var(--font-ui);
  color: var(--page-ink);
  background:
    radial-gradient(circle at left top, var(--hero-glow-a), transparent 34%),
    radial-gradient(circle at 86% 10%, var(--hero-glow-b), transparent 24%),
    linear-gradient(180deg, var(--page-bg-top) 0%, var(--page-bg) 45%, var(--page-bg-bottom) 100%);
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: 0;
}

body::before {
  top: -8rem;
  right: -8rem;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: radial-gradient(circle, var(--hero-glow-a), transparent 68%);
  opacity: 0.75;
}

body::after {
  left: -10rem;
  bottom: -10rem;
  width: 28rem;
  height: 28rem;
  border-radius: 50%;
  background: radial-gradient(circle, var(--hero-glow-b), transparent 70%);
  opacity: 0.6;
}

a {
  color: inherit;
}

button,
input,
select,
textarea {
  font: inherit;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --reveal-duration: 1ms;
  }
}

@keyframes runner-card-reveal {
  from {
    opacity: 0;
    transform: translateY(22px) scale(0.985);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes runner-chip-reveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.45rem;
  padding: 0.1rem 0.34rem;
  border-radius: 0.5rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: inset 0 -1px 0 rgba(21, 34, 47, 0.08);
  font-size: 0.82rem;
}

.site-shell {
  position: relative;
  z-index: 1;
  max-width: 1460px;
  margin: 0 auto;
  padding: max(1.15rem, env(safe-area-inset-top)) 1.25rem max(1.25rem, env(safe-area-inset-bottom));
}

.site-nav,
.hero-copy,
.hero-panel,
.canvas-card,
.brief-card,
.detail-card,
.duo-card,
.legend-card,
.game-footer {
  border: 1px solid var(--line);
  border-radius: 1.6rem;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  opacity: 0;
  animation: runner-card-reveal var(--reveal-duration) cubic-bezier(0.2, 0.9, 0.2, 1) both;
}

.site-nav {
  animation-delay: 20ms;
}

.hero-copy {
  animation-delay: 80ms;
}

.hero-panel {
  animation-delay: 140ms;
}

.canvas-card {
  animation-delay: 200ms;
}

.brief-card {
  animation-delay: 240ms;
}

.detail-card {
  animation-delay: 300ms;
}

.duo-card {
  animation-delay: 360ms;
}

.legend-card {
  animation-delay: 420ms;
}

.game-footer {
  animation-delay: 480ms;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.35rem;
  padding: 0.95rem 1.1rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.site-brand-mark {
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 0.72rem;
  background:
    radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.98), transparent 40%),
    linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.52);
}

.site-brand-label,
.panel-label,
.eyebrow,
.metric-label,
.rail-label,
.detail-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-brand-name {
  display: block;
  font-size: 1.08rem;
  font-weight: 700;
}

.site-links {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.site-links a,
.mini-link {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  color: var(--page-ink);
  background: transparent;
}

.site-links a:hover,
.site-links a:focus-visible,
.mini-link:hover,
.mini-link:focus-visible {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.72);
}

.mini-link {
  cursor: pointer;
}

.page-shell {
  display: grid;
  gap: 1.35rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr);
  gap: 1.2rem;
  align-items: stretch;
}

.hero-copy,
.hero-panel,
.canvas-card,
.brief-card,
.detail-card,
.duo-card,
.legend-card {
  position: relative;
  overflow: hidden;
}

.hero-copy {
  padding: 1.7rem 1.8rem;
  background: var(--hero-copy-surface);
}

.hero-copy::before,
.hero-panel::before,
.canvas-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-copy::before {
  background:
    linear-gradient(140deg, var(--accent-soft), transparent 38%),
    linear-gradient(180deg, transparent 68%, rgba(255, 255, 255, 0.6));
}

.hero-panel::before {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.78), transparent 48%),
    radial-gradient(circle at top right, var(--accent-2-soft), transparent 32%);
}

.canvas-card::before {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.42), transparent 36%),
    radial-gradient(circle at top right, var(--accent-soft), transparent 28%);
}

.hero-topline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.95rem;
}

.hero-pills {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.78rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero-pill,
.rail-card,
.metric,
.status-banner,
.detail-item,
.tag-chip,
.touch-btn,
.btn,
.level-dot {
  animation: runner-chip-reveal 560ms cubic-bezier(0.18, 0.88, 0.22, 1) both;
}

.hero-pill:nth-child(1) { animation-delay: 180ms; }
.hero-pill:nth-child(2) { animation-delay: 240ms; }
.rail-card:nth-child(1) { animation-delay: 220ms; }
.rail-card:nth-child(2) { animation-delay: 260ms; }
.rail-card:nth-child(3) { animation-delay: 300ms; }
.metric:nth-child(1) { animation-delay: 200ms; }
.metric:nth-child(2) { animation-delay: 230ms; }
.metric:nth-child(3) { animation-delay: 260ms; }
.metric:nth-child(4) { animation-delay: 290ms; }
.metric:nth-child(5) { animation-delay: 320ms; }
.detail-item:nth-child(1) { animation-delay: 300ms; }
.detail-item:nth-child(2) { animation-delay: 340ms; }
.detail-item:nth-child(3) { animation-delay: 380ms; }
.detail-item:nth-child(4) { animation-delay: 420ms; }
.tag-chip:nth-child(1) { animation-delay: 420ms; }
.tag-chip:nth-child(2) { animation-delay: 450ms; }
.tag-chip:nth-child(3) { animation-delay: 480ms; }

.hero-pill-accent {
  border-color: var(--accent-border);
  background: linear-gradient(135deg, var(--accent-soft), rgba(255, 255, 255, 0.9));
}

.hero-copy h1 {
  margin: 0.2rem 0 0.85rem;
  font-size: clamp(2.7rem, 4vw, 4.5rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
}

.intro {
  margin: 0;
  max-width: 54rem;
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--copy);
}

.intro-help {
  margin: 0.95rem 0 0;
  line-height: 1.62;
  color: var(--muted);
}

.intro-install {
  min-height: 1.5rem;
}

.run-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.35rem;
}

.rail-card {
  padding: 0.9rem 1rem;
  border-radius: 1.2rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  display: grid;
  gap: 0.42rem;
  align-content: start;
  min-height: 5.45rem;
}

.rail-value {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
}

.difficulty-pips {
  display: flex;
  gap: 0.35rem;
}

.difficulty-pip {
  width: 1rem;
  height: 0.42rem;
  border-radius: 999px;
  background: rgba(21, 34, 47, 0.1);
}

.difficulty-pip.is-filled {
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
}

.hero-panel {
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
  align-content: start;
  background: var(--hero-surface);
}

.metrics,
.mobile-metrics {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.72rem;
}

.metric {
  padding: 0.9rem 0.95rem;
  border-radius: 1.12rem;
  background: var(--panel-strong);
  border: 1px solid rgba(21, 34, 47, 0.08);
}

.metric-value {
  display: block;
  margin-top: 0.42rem;
  font-size: 1.14rem;
  font-weight: 800;
}

.metric-meta {
  display: block;
  margin-top: 0.28rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.metric-compact .metric-value {
  font-size: 1rem;
}

.action-row,
.canvas-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.82rem;
  border: 1px solid rgba(21, 34, 47, 0.12);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.84);
  color: var(--page-ink);
  cursor: pointer;
  text-align: center;
  transition: transform 140ms ease, background 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.btn:hover,
.btn:focus-visible,
.touch-btn:hover,
.touch-btn:focus-visible,
.duo-link:hover,
.duo-link:focus-visible {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 14px 26px rgba(21, 34, 47, 0.1);
}

.btn:disabled,
.level-dot:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  box-shadow: none;
  transform: none;
}

.btn-strong {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: var(--accent-ink);
  font-weight: 800;
}

.btn-compact {
  min-height: 2.6rem;
}

.level-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.level-pagination {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.75rem;
}

.level-pagination-compact .level-page-btn {
  min-width: 4.1rem;
}

.level-page-status {
  flex: 1;
  min-width: 0;
  text-align: center;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--muted);
}

.level-dot {
  width: 2.3rem;
  height: 2.3rem;
  border: 1px solid rgba(21, 34, 47, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  font-weight: 700;
  color: var(--page-ink);
}

.level-dot.is-current {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: var(--accent-ink);
}

.level-dot.is-locked {
  background: rgba(255, 255, 255, 0.5);
}

.level-page-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.status-banner {
  padding: 0.85rem 1rem;
  border-radius: 1.15rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
}

.status-copy {
  margin: 0;
  min-height: 1.45rem;
  line-height: 1.55;
  color: var(--copy);
}

.status-copy-compact {
  font-size: 0.95rem;
}

.stage-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.88fr);
  gap: 1.2rem;
  align-items: start;
}

.canvas-card {
  padding: 1rem;
  background: var(--canvas-shell);
}

.canvas-stage {
  padding: 0.82rem;
  border-radius: 1.35rem;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.18);
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1.2rem;
  border: 1px solid var(--canvas-border);
}

.canvas-bottom-bar {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr) minmax(0, 0.9fr);
  gap: 0.85rem;
  margin-top: 0.95rem;
  align-items: start;
}

.mobile-stage-panel,
.brief-card,
.detail-card,
.duo-card,
.legend-card {
  padding: 1.15rem 1.2rem;
  background: rgba(255, 255, 255, 0.72);
}

.mobile-stage-panel {
  display: none;
}

.brief-column {
  display: grid;
  gap: 1rem;
}

.brief-card h2,
.duo-card h2 {
  margin: 0.24rem 0 0.7rem;
  font-size: 1.55rem;
  line-height: 1.05;
}

.brief-copy {
  margin: 0;
  line-height: 1.7;
  color: var(--copy);
}

.brief-hint {
  margin: 0.95rem 0 0;
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--accent-border);
  background: linear-gradient(135deg, var(--accent-soft), rgba(255, 255, 255, 0.9));
  line-height: 1.6;
  color: var(--page-ink);
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.72rem;
}

.detail-item {
  padding: 0.86rem 0.92rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.84);
}

.detail-value {
  display: block;
  margin-top: 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.48rem 0.78rem;
  border-radius: 999px;
  border: 1px solid var(--tag-border);
  background: var(--tag-bg);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.duo-copy {
  margin: 0;
  line-height: 1.65;
  color: var(--copy);
}

.duo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 0.85rem;
  padding-inline: 1rem;
  text-decoration: none;
}

.legend-list {
  display: grid;
  gap: 0.84rem;
}

.legend-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: flex-start;
  color: var(--copy);
  line-height: 1.55;
}

.swatch {
  width: 1rem;
  height: 1rem;
  margin-top: 0.22rem;
  border-radius: 0.35rem;
  background: var(--swatch-fill, var(--accent));
  border: 1px solid var(--swatch-edge, transparent);
  box-shadow: 0 0 0 4px var(--swatch-glow, rgba(255, 255, 255, 0.2));
}

.touch-controls {
  display: grid;
  grid-template-columns: repeat(var(--touch-columns), minmax(0, 1fr));
  gap: 0.65rem;
}

.touch-btn {
  min-height: 3.3rem;
  border: 1px solid rgba(21, 34, 47, 0.12);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.84);
  color: var(--page-ink);
  cursor: pointer;
}

.touch-btn[data-active="true"],
.touch-btn-jump,
.touch-btn-dash {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: var(--accent-ink);
  font-weight: 800;
}

.game-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
}

.game-footer-copy {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.game-footer-links {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.game-footer-links a {
  text-decoration: none;
}

@media (max-width: 1080px) {
  .hero,
  .stage-shell {
    grid-template-columns: 1fr;
  }

  .canvas-bottom-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mobile-stage-panel {
    display: grid;
    gap: 0.75rem;
  }
}

@media (max-width: 760px) {
  body::before,
  body::after {
    display: none;
  }

  .site-shell {
    padding-inline: 0.9rem;
  }

  .site-nav {
    padding: 0.9rem;
    border-radius: 1.35rem;
  }

  .site-links {
    width: 100%;
    justify-content: flex-start;
  }

  .hero-copy,
  .hero-panel,
  .canvas-card,
  .brief-card,
  .detail-card,
  .duo-card,
  .legend-card,
  .game-footer {
    border-radius: 1.35rem;
  }

  .hero-copy,
  .hero-panel,
  .canvas-card,
  .brief-card,
  .detail-card,
  .duo-card,
  .legend-card {
    padding-inline: 1rem;
  }

  .hero-topline {
    display: grid;
  }

  .hero-pills {
    justify-content: flex-start;
  }

  .hero-copy h1 {
    font-size: clamp(2.25rem, 12vw, 3.4rem);
  }

  .run-rail,
  .detail-grid,
  .canvas-bottom-bar {
    grid-template-columns: 1fr;
  }

  .metrics,
  .mobile-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .action-row,
  .canvas-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .touch-controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}