/* =============================================
   Tank Battle — Kids Design System Edition
   设计令牌来自 kids-design-system/references/design-tokens.md
   ============================================= */

/* === CSS Custom Properties (Design Tokens) === */
:root {
  /* Primary (Warm) */
  --c-primary-50: #fff7ed;
  --c-primary-100: #ffedd5;
  --c-primary-300: #fdba74;
  --c-primary-500: #f97316;
  --c-primary-700: #c2410c;
  --c-primary-900: #7c2d12;
  /* Accent */
  --c-pink: #ec4899;
  --c-purple: #a855f7;
  --c-blue: #3b82f6;
  --c-cyan: #06b6d4;
  --c-green: #22c55e;
  --c-yellow: #eab308;
  --c-red: #ef4444;
  /* Neutral */
  --c-white: #ffffff;
  --c-gray-100: #f3f4f6;
  --c-gray-300: #d1d5db;
  --c-gray-500: #6b7280;
  --c-gray-700: #374151;
  --c-gray-900: #111827;
  --c-black: #000000;
  /* Semantic (Kid-Friendly) */
  --c-success: #22c55e;
  --c-warning: #f59e0b;
  --c-error: #f97316;
  --c-info: #3b82f6;
  /* Typography */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 18px;
  --text-lg: 22px;
  --text-xl: 28px;
  --text-2xl: 36px;
  --text-3xl: 48px;
  --score-lg: 32px;
  --score-xl: 56px;
  /* Spacing */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  /* Border Radius */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 20px;
  --r-full: 9999px;
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-xl: 0 12px 40px rgba(0,0,0,0.15);
  --shadow-text: 2px 2px 0 rgba(0,0,0,0.3);
  /* Animation */
  --dur-fast: 150ms;
  --dur-normal: 300ms;
  --dur-slow: 500ms;
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-bounce: cubic-bezier(0.2, 1.8, 0.6, 0.9);
}

/* === Global Reset === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 10%, rgba(249,115,22,0.15), transparent 35%),
    radial-gradient(circle at 80% 90%, rgba(236,72,153,0.10), transparent 35%),
    linear-gradient(180deg, #1a1025 0%, #1e1630 40%, #162032 100%);
  color: #f8fafc;
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--sp-6);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  overflow: hidden;
}

#game-shell {
  width: min(100%, 1100px);
}

/* === Game Container === */
#game-container {
  position: relative;
  width: 960px;
  height: 640px;
  max-width: 100%;
  margin: 0 auto;
  overflow: hidden;
  border-radius: var(--r-xl);
  border: 2px solid rgba(255,255,255,0.12);
  background: var(--c-gray-900);
  box-shadow:
    var(--shadow-xl),
    0 0 60px rgba(249,115,22,0.08);
  transition: box-shadow var(--dur-normal) var(--ease-out);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* === Screen Overlays === */
.screen {
  position: absolute;
  inset: 0;
  background: rgba(5,5,20,0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--sp-6);
  z-index: 20;
  animation: fadeIn var(--dur-normal) var(--ease-out);
}

.hidden {
  display: none !important;
}

/* === Panel (Card-kids style) === */
.panel {
  width: min(100%, 680px);
  padding: var(--sp-8);
  border-radius: var(--r-xl);
  background: linear-gradient(180deg, rgba(30,28,45,0.97), rgba(20,18,38,0.97));
  border: 2px solid rgba(249,115,22,0.12);
  box-shadow: var(--shadow-xl);
  animation: bounceIn var(--dur-slow) var(--ease-spring);
}

.start-panel h1,
.modal-panel h2 {
  margin-top: 0;
  margin-bottom: var(--sp-3);
  font-size: var(--text-2xl);
  font-weight: 800;
}

.subtitle {
  margin: 0 0 var(--sp-6);
  color: var(--c-gray-300);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* === Tank Selection Cards === */
#tank-selection {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}

.tank-card {
  position: relative;
  border: 2px solid rgba(255,255,255,0.08);
  border-radius: var(--r-xl);
  background: rgba(40,36,58,0.8);
  color: inherit;
  padding: var(--sp-6) var(--sp-4);
  text-align: left;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}

.tank-card:hover {
  transform: translateY(-4px);
  border-color: rgba(249,115,22,0.5);
  box-shadow: var(--shadow-md);
}

.tank-card.selected {
  border-color: var(--c-yellow);
  background: rgba(40,36,58,0.95);
  box-shadow: 0 0 0 2px rgba(234,179,8,0.25), inset 0 0 0 1px rgba(234,179,8,0.12);
}

.tank-card strong {
  display: block;
  font-size: var(--text-lg);
  font-weight: 700;
}

.tank-card small {
  display: block;
  margin-top: var(--sp-2);
  color: var(--c-gray-300);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.tank-color {
  display: inline-block;
  width: 64px;
  height: 64px;
  border-radius: var(--r-lg);
  margin-bottom: var(--sp-4);
  box-shadow: inset 0 -12px 0 rgba(0,0,0,0.2);
}

/* === Tips Block === */
.tips-block {
  margin-bottom: var(--sp-6);
  padding: var(--sp-4) var(--sp-5);
  border-radius: var(--r-lg);
  background: rgba(15,13,28,0.7);
  color: #dbeafe;
  font-size: var(--text-sm);
  line-height: 1.7;
}

.tips-block p {
  margin: var(--sp-1) 0;
}

/* === Buttons — Kids Design System === */
button {
  font: inherit;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.primary-btn,
.secondary-btn,
.shop-btn,
.bank-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 56px;
  border: none;
  border-radius: var(--r-md);
  color: var(--c-white);
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: 700;
  padding: var(--sp-3) var(--sp-6);
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              filter var(--dur-fast) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
}

.primary-btn:hover,
.secondary-btn:hover,
.shop-btn:hover,
.bank-btn:hover {
  transform: translateY(-1px) scale(1.02);
  filter: brightness(1.08);
}

.primary-btn:active,
.secondary-btn:active,
.shop-btn:active,
.bank-btn:active {
  transform: scale(0.96);
}

/* Primary: warm gold gradient */
.primary-btn {
  background: linear-gradient(135deg, var(--c-yellow), #ea580c);
  box-shadow: var(--shadow-md), 0 0 16px rgba(234,179,8,0.2);
}

/* Secondary: warm gray */
.secondary-btn {
  background: linear-gradient(135deg, #64748b, #475569);
  box-shadow: var(--shadow-sm);
}

/* Shop: pink/purple */
.shop-btn {
  background: linear-gradient(135deg, var(--c-pink), #be185d);
  box-shadow: var(--shadow-sm);
}

/* Bank: blue */
.bank-btn {
  background: linear-gradient(135deg, var(--c-blue), #1d4ed8);
  box-shadow: var(--shadow-sm);
}

/* Shop/Bank item grids */
.shop-items,
.bank-actions {
  display: grid;
  gap: var(--sp-3);
  margin: var(--sp-5) 0;
}

/* === HUD Layer === */
#ui-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

.hud-column {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.hud-left {
  top: var(--sp-4);
  left: var(--sp-4);
}

.hud-right {
  top: var(--sp-4);
  right: var(--sp-4);
  width: 280px;
}

/* === HUD Cards === */
.hud-card {
  pointer-events: none;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-lg);
  background: rgba(15,13,28,0.82);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 8px 24px rgba(15,13,28,0.3);
}

.compact {
  min-width: 200px;
}

/* === Health Card === */
.health-head {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-4);
  align-items: center;
  margin-bottom: var(--sp-2);
}

.hud-label {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-gray-300);
}

.hud-value {
  font-size: var(--text-lg);
  font-weight: 800;
}

/* === Meters === */
.meter {
  height: 12px;
  border-radius: var(--r-sm);
  background: rgba(40,36,58,0.9);
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  border-radius: inherit;
  transition: width 0.2s var(--ease-out);
}

.meter-health .meter-fill {
  background: linear-gradient(90deg, var(--c-green), var(--c-yellow), var(--c-error));
  background-size: 200% 100%;
}

.meter-fuel .meter-fill {
  background: linear-gradient(90deg, var(--c-primary-500), var(--c-yellow));
}

/* === HUD Bottom (Abilities) === */
.hud-bottom {
  position: absolute;
  left: var(--sp-4);
  right: var(--sp-4);
  bottom: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  align-items: center;
}

.ability-row {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  justify-content: center;
}

.ability-chip {
  min-width: 150px;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-lg);
  background: rgba(15,13,28,0.85);
  border: 1px solid rgba(147,197,253,0.18);
  display: grid;
  gap: 2px;
  text-align: center;
  transition: opacity var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.ability-chip span {
  font-size: var(--text-xs);
  color: #93c5fd;
  font-weight: 700;
}

.ability-chip strong {
  font-size: var(--text-base);
}

.ability-chip em {
  font-style: normal;
  font-size: var(--text-xs);
  color: var(--c-gray-300);
}

.ability-chip.cooling {
  opacity: 0.55;
}

.ability-chip.ready {
  box-shadow: 0 0 0 1px rgba(56,189,248,0.25), 0 0 12px rgba(56,189,248,0.08);
}

.ability-chip.ready:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(56,189,248,0.4), 0 0 18px rgba(56,189,248,0.15);
}

/* === Status Text Bar === */
.status-text {
  min-width: min(100%, 560px);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-full);
  background: rgba(15,13,28,0.85);
  color: var(--c-gray-100);
  font-size: var(--text-sm);
  text-align: center;
  border: 1px solid rgba(255,255,255,0.08);
}

/* === Toast Notification System === */
#toast-container {
  position: fixed;
  top: var(--sp-5);
  left: 50%;
  transform: translateX(-50%);
  z-index: 500;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  pointer-events: none;
}

.toast {
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--r-full);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--c-white);
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.35s var(--ease-spring),
             toastOut 0.3s var(--ease-in) 1.8s forwards;
  pointer-events: none;
}

.toast--success { background: rgba(34,197,94,0.92); }
.toast--info    { background: rgba(59,130,246,0.92); }
.toast--gold    { background: rgba(234,179,8,0.92); color: var(--c-gray-900); }
.toast--warn    { background: rgba(249,115,22,0.92); }
.toast--special { background: linear-gradient(135deg, var(--c-purple), var(--c-pink)); }

/* === Shop/Bank Panel Money Display === */
#shop-money, #bank-money, #bank-balance {
  font-weight: 800;
  color: var(--c-yellow);
}

/* === Game Over Screen === */
#game-over-screen .panel {
  text-align: center;
}

#game-over-reason {
  margin-bottom: var(--sp-6);
  font-size: var(--text-base);
  color: var(--c-gray-300);
}

#restart-btn {
  min-width: 200px;
}

/* === Keyframe Animations === */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}

@keyframes bounceIn {
  0%   { transform: scale(0.5); opacity: 0; }
  60%  { transform: scale(1.04); }
  80%  { transform: scale(0.97); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes toastIn {
  from { transform: translateY(-40px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(-16px) scale(0.9); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 8px currentColor; }
  50%      { box-shadow: 0 0 20px currentColor, 0 0 40px currentColor; }
}

@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.05); opacity: 0.9; }
}

/* === Responsive === */
@media (max-width: 1024px) {
  body {
    padding: var(--sp-3);
    align-items: flex-start;
  }

  #game-container {
    width: 100%;
    height: min(82vh, 640px);
  }

  #tank-selection {
    grid-template-columns: 1fr;
  }

  .hud-right {
    width: 220px;
  }

  .ability-chip {
    min-width: 130px;
  }
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}