:root {
  --background: 215 44% 97%;
  --foreground: 228 30% 12%;
  --primary: 191 100% 50%;
  --secondary: 319 90% 62%;
  --muted: 220 24% 92%;
  --destructive: 348 89% 60%;
  --border: 223 24% 82%;
  --card: 0 0% 100%;

  --shadow-sm: 0 6px 18px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 18px 40px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.2);

  --transition-fast: 160ms ease;
  --transition-smooth: 320ms cubic-bezier(0.22, 1, 0.36, 1);

  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
}

.dark {
  --background: 230 34% 8%;
  --foreground: 210 40% 98%;
  --primary: 191 100% 55%;
  --secondary: 322 100% 67%;
  --muted: 228 23% 16%;
  --destructive: 348 93% 64%;
  --border: 223 18% 24%;
  --card: 229 30% 12%;
}

* {
  box-sizing: border-box;
}

html,
body,
#root {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  transition: background var(--transition-smooth), color var(--transition-smooth);
}

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

button {
  cursor: pointer;
}

.app-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 15%, hsla(var(--primary), 0.18), transparent 26%),
    radial-gradient(circle at 80% 10%, hsla(var(--secondary), 0.14), transparent 24%),
    linear-gradient(180deg, hsla(var(--background), 1), hsla(var(--background), 0.98));
}

.aurora {
  position: absolute;
  inset: auto;
  width: 20rem;
  height: 20rem;
  border-radius: 999px;
  filter: blur(70px);
  opacity: 0.18;
  pointer-events: none;
}

.aurora-one {
  top: -4rem;
  right: -4rem;
  background: hsl(var(--primary));
}

.aurora-two {
  bottom: -8rem;
  left: -4rem;
  background: hsl(var(--secondary));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  border-bottom: 1px solid hsl(var(--border) / 0.6);
  background: hsl(var(--background) / 0.72);
  backdrop-filter: blur(16px);
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  user-select: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 14px;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.18), hsl(var(--secondary) / 0.22));
  box-shadow: var(--shadow-sm);
}

.brand-title {
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-subtitle {
  font-size: 0.82rem;
  color: hsl(var(--foreground) / 0.68);
}

.nav-links {
  display: none;
  gap: 0.5rem;
}

.nav-btn,
.icon-btn,
.textual-btn,
.btn,
.control-btn {
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.nav-btn {
  border: 1px solid hsl(var(--border));
  background: hsl(var(--card) / 0.65);
  color: hsl(var(--foreground));
  border-radius: 999px;
  padding: 0.65rem 0.95rem;
}

.nav-btn:hover,
.nav-btn.active {
  transform: translateY(-1px);
  border-color: hsl(var(--primary) / 0.6);
  box-shadow: 0 0 0 4px hsl(var(--primary) / 0.08);
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid hsl(var(--border));
  border-radius: 999px;
  background: hsl(var(--card) / 0.8);
}

.icon-btn:hover,
.btn:hover,
.control-btn:hover,
.textual-btn:hover {
  transform: translateY(-1px);
}

.app-main {
  position: relative;
  z-index: 1;
  width: min(1200px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: 1rem 0 4rem;
}

.app-footer {
  position: relative;
  z-index: 1;
  width: min(1200px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: 0 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  color: hsl(var(--foreground) / 0.72);
  font-size: 0.92rem;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.inline-badge,
.pill,
.mini-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
}

.inline-badge,
.pill {
  padding: 0.35rem 0.7rem;
  background: hsl(var(--primary) / 0.12);
  color: hsl(var(--primary));
}

.pill.subtle {
  background: hsl(var(--foreground) / 0.08);
  color: hsl(var(--foreground) / 0.75);
}

.screen-grid {
  display: grid;
  gap: 1rem;
}

.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid hsl(var(--border) / 0.8);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, hsl(var(--card) / 0.94), hsl(var(--card) / 0.82));
  box-shadow: var(--shadow-md);
  padding: 1rem;
}

.panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.05), transparent 35%, hsl(var(--secondary) / 0.05));
  pointer-events: none;
}

.panel-title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
}

.panel-subtitle {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 700;
}

.panel-copy {
  margin: 0.45rem 0 0;
  color: hsl(var(--foreground) / 0.72);
  line-height: 1.6;
}

.hero-panel {
  display: grid;
  gap: 1.2rem;
}

.hero-title {
  margin: 0.8rem 0 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.hero-title.compact {
  font-size: clamp(1.7rem, 4vw, 2.7rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.2rem;
  font-weight: 700;
}

.btn-primary {
  color: text-white;
  color: white;
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--secondary)));
  box-shadow: 0 14px 28px hsl(var(--primary) / 0.22);
}

.btn-secondary {
  border: 1px solid hsl(var(--border));
  color: hsl(var(--foreground));
  background: hsl(var(--card) / 0.78);
}

.textual-btn {
  background: transparent;
  border: none;
  padding: 0;
  color: hsl(var(--primary));
  font-weight: 700;
}

.stats-row,
.run-summary-grid,
.hud-grid {
  display: grid;
  gap: 0.75rem;
}

.stat-card {
  border: 1px solid hsl(var(--border) / 0.85);
  border-radius: var(--radius-md);
  background: hsl(var(--background) / 0.45);
  padding: 0.9rem;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: hsl(var(--foreground) / 0.64);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-value {
  display: block;
  margin-top: 0.35rem;
  font-size: 1.25rem;
  font-weight: 800;
}

.hero-visual {
  display: grid;
  place-items: center;
}

.city-card {
  position: relative;
  width: 100%;
  min-height: 290px;
  border-radius: 24px;
  overflow: hidden;
  background: linear-gradient(180deg, hsl(var(--background) / 0.25), hsl(var(--muted) / 0.22));
  border: 1px solid hsl(var(--border));
}

.city-road {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  width: 58%;
  height: 100%;
  background: linear-gradient(180deg, hsl(var(--foreground) / 0.1), hsl(var(--foreground) / 0.24));
}

.city-road::before,
.city-road::after {
  content: '';
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  background: hsl(var(--primary) / 0.28);
}

.city-road::before {
  left: 32%;
}

.city-road::after {
  right: 32%;
}

.city-runner,
.city-coin,
.city-obstacle {
  position: absolute;
}

.city-runner {
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 2.4rem;
  animation: floatRunner 1.2s ease-in-out infinite;
}

.city-obstacle {
  width: 1.2rem;
  height: 3.2rem;
  border-radius: 10px;
  box-shadow: 0 0 18px currentColor;
}

.obstacle-a {
  bottom: 5rem;
  left: 35%;
  background: hsl(var(--secondary));
  color: hsl(var(--secondary));
}

.obstacle-b {
  top: 5rem;
  right: 35%;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: hsl(var(--primary));
  color: hsl(var(--primary));
}

.city-coin {
  top: 30%;
  left: 55%;
  color: #ffd166;
  font-size: 1.6rem;
  animation: spinCoin 2s linear infinite;
}

.content-grid {
  display: grid;
  gap: 1rem;
}

.character-grid {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.character-card {
  width: 100%;
  text-align: left;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid hsl(var(--border));
  background: hsl(var(--background) / 0.46);
}

.character-card.selected {
  border-color: var(--char-color);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--char-color) 20%, transparent);
  transform: translateY(-2px);
}

.character-head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 0.75rem;
}

.character-avatar {
  display: grid;
  place-items: center;
  width: 3.2rem;
  height: 3.2rem;
  border-radius: 16px;
  font-size: 1.55rem;
  background: color-mix(in srgb, var(--char-color) 22%, transparent);
}

.character-meta {
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}

.character-meta span,
.character-card p,
.power-card p,
.instruction-item p,
.empty-state p,
.overlay-card p {
  color: hsl(var(--foreground) / 0.72);
  margin: 0;
  line-height: 1.55;
}

.character-tags,
.power-grid,
.control-tips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mini-tag {
  padding: 0.35rem 0.65rem;
  background: hsl(var(--foreground) / 0.07);
  color: hsl(var(--foreground) / 0.8);
}

.instruction-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.instruction-item {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.75rem;
  align-items: start;
}

.instruction-item span,
.power-card span {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 14px;
  background: hsl(var(--primary) / 0.12);
}

.divider {
  height: 1px;
  background: hsl(var(--border));
  margin: 1rem 0;
}

.power-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.power-card {
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius-md);
  background: hsl(var(--background) / 0.42);
  padding: 0.9rem;
}

.latest-run-panel {
  display: grid;
  gap: 1rem;
}

.flex-row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.wrap-gap {
  flex-wrap: wrap;
}

.empty-state {
  display: grid;
  gap: 0.55rem;
  place-items: center;
  text-align: center;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px dashed hsl(var(--border));
  background: hsl(var(--background) / 0.36);
}

.compact-empty {
  padding: 1.1rem;
}

.skeleton-panel {
  min-height: 320px;
}

.skeleton {
  border-radius: 999px;
  background: linear-gradient(90deg, hsl(var(--muted)), hsl(var(--card)), hsl(var(--muted)));
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
}

.skeleton-title {
  width: 62%;
  height: 1.6rem;
}

.skeleton-line {
  width: 100%;
  height: 1rem;
  margin-top: 0.85rem;
}

.skeleton-line.short {
  width: 68%;
}

.skeleton-card {
  width: 100%;
  height: 6.5rem;
  border-radius: var(--radius-md);
}

.leaderboard-list {
  display: grid;
  gap: 0.75rem;
}

.leaderboard-row {
  display: grid;
  grid-template-columns: auto 1fr repeat(2, auto);
  gap: 0.75rem;
  align-items: center;
  padding: 0.85rem 0.95rem;
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius-md);
  background: hsl(var(--background) / 0.42);
}

.leaderboard-rank {
  min-width: 3rem;
  font-weight: 800;
  color: hsl(var(--primary));
}

.leaderboard-player,
.leaderboard-metric {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.leaderboard-player span,
.leaderboard-metric span {
  font-size: 0.85rem;
  color: hsl(var(--foreground) / 0.68);
}

.game-panel {
  gap: 1rem;
}

.game-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.game-topbar-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.game-stage {
  position: relative;
  margin-top: 1rem;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--background) / 0.45);
  box-shadow: var(--shadow-lg);
}

.game-canvas {
  display: block;
  width: 100%;
  max-width: 540px;
  aspect-ratio: 9 / 16;
  margin: 0 auto;
}

.game-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: hsl(var(--background) / 0.45);
  backdrop-filter: blur(10px);
  padding: 1rem;
}

.overlay-card {
  width: min(100%, 24rem);
  text-align: center;
  padding: 1.3rem;
  border-radius: 24px;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--card) / 0.92);
  box-shadow: var(--shadow-lg);
}

.overlay-card h2 {
  margin: 0;
  font-size: 1.4rem;
}

.overlay-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.control-panel {
  margin-top: 1rem;
  display: grid;
  gap: 0.9rem;
}

.touch-controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.control-btn {
  min-height: 3.25rem;
  border-radius: 18px;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--card) / 0.78);
  color: hsl(var(--foreground));
  font-size: 1.15rem;
  font-weight: 800;
}

.mt-4 {
  margin-top: 1rem;
}

@keyframes shimmer {
  from {
    background-position: 200% 0;
  }
  to {
    background-position: -200% 0;
  }
}

@keyframes floatRunner {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-6px);
  }
}

@keyframes spinCoin {
  from {
    transform: rotateY(0deg);
  }
  to {
    transform: rotateY(360deg);
  }
}

@media (min-width: 640px) {
  .topbar {
    padding: 1rem 1.25rem;
  }

  .nav-links {
    display: flex;
  }

  .panel {
    padding: 1.25rem;
  }

  .stats-row,
  .run-summary-grid,
  .hud-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .hero-panel,
  .content-grid {
    grid-template-columns: 1.2fr 0.9fr;
    align-items: stretch;
  }

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

@media (min-width: 900px) {
  .app-main,
  .app-footer {
    width: min(1280px, calc(100% - 2rem));
  }

  .stats-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .run-summary-grid,
  .hud-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .content-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .character-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 639px) {
  .topbar {
    flex-wrap: wrap;
  }

  .game-topbar,
  .flex-row-between,
  .leaderboard-row {
    grid-template-columns: 1fr;
    display: grid;
  }

  .leaderboard-row {
    gap: 0.4rem;
  }

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