/* ===========================
   全局基础样式
   =========================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #00d4ff;
  --secondary: #ff6b35;
  --accent: #7c3aed;
  --dark: #0a0a1a;
  --dark2: #0f0f2e;
  --dark3: #1a1a3e;
  --text: #e0e6ff;
  --text-dim: #8892b0;
  --success: #00ff88;
  --danger: #ff4466;
  --gold: #ffd700;
}

body {
  background: var(--dark);
  color: var(--text);
  font-family: 'Segoe UI', 'Arial', sans-serif;
  overflow: hidden;
  user-select: none;
}

/* ===========================
   星空背景动画
   =========================== */
.stars-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  overflow: hidden;
}

.stars-bg::before,
.stars-bg::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 200%;
  background-image:
    radial-gradient(1px 1px at 10% 20%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 50%, #adf 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 50% 10%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 80%, #fff 0%, transparent 100%),
    radial-gradient(2px 2px at 90% 30%, #adf 0%, transparent 100%),
    radial-gradient(1px 1px at 15% 70%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 40%, #fff 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 80% 60%, #adf 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 90%, #fff 0%, transparent 100%),
    radial-gradient(2px 2px at 65% 15%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 40% 75%, #adf 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 45%, #fff 0%, transparent 100%);
  background-size: 300px 300px;
  animation: starsScroll 20s linear infinite;
}

.stars-bg::after {
  background-size: 500px 500px;
  animation-duration: 35s;
  opacity: 0.5;
}

@keyframes starsScroll {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50%); }
}

/* ===========================
   页面容器
   =========================== */
.page {
  position: relative;
  z-index: 1;
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* ===========================
   通用标题
   =========================== */
.game-title {
  font-size: clamp(2rem, 8vw, 5rem);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, var(--primary), var(--accent), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 30px rgba(0,212,255,0.5));
  animation: titlePulse 3s ease-in-out infinite;
}

@keyframes titlePulse {
  0%, 100% { filter: drop-shadow(0 0 30px rgba(0,212,255,0.5)); }
  50% { filter: drop-shadow(0 0 60px rgba(0,212,255,0.9)) drop-shadow(0 0 100px rgba(124,58,237,0.4)); }
}

.game-subtitle {
  font-size: clamp(0.8rem, 2vw, 1.1rem);
  color: var(--text-dim);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

/* ===========================
   按钮系统
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.4s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 0 20px rgba(0,212,255,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0,212,255,0.6);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  box-shadow: 0 0 10px rgba(0,212,255,0.2), inset 0 0 10px rgba(0,212,255,0.05);
}

.btn-secondary:hover {
  background: rgba(0,212,255,0.1);
  box-shadow: 0 0 20px rgba(0,212,255,0.4);
  transform: translateY(-2px);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger), #ff8c00);
  color: #fff;
  box-shadow: 0 0 20px rgba(255,68,102,0.4);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(255,68,102,0.6);
}

.btn-lg {
  padding: 1rem 3rem;
  font-size: 1.2rem;
}

.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
}

/* ===========================
   面板/卡片
   =========================== */
.panel {
  background: rgba(15, 15, 46, 0.85);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 12px;
  padding: 2rem;
  backdrop-filter: blur(10px);
  box-shadow: 0 0 40px rgba(0,0,0,0.5), inset 0 0 40px rgba(0,212,255,0.02);
}

/* ===========================
   HUD 状态栏
   =========================== */
.hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: rgba(10,10,26,0.8);
  border-bottom: 1px solid rgba(0,212,255,0.2);
  backdrop-filter: blur(8px);
  gap: 1rem;
}

.hud-score {
  color: var(--gold);
  font-size: 1.2rem;
  font-weight: 700;
}

.hud-life {
  color: var(--danger);
  font-size: 1.1rem;
}

.hud-level {
  color: var(--primary);
  font-size: 1rem;
  margin-left: auto;
}

/* 生命值心形 */
.heart {
  display: inline-block;
  color: var(--danger);
  font-size: 1.2rem;
  transition: transform 0.2s;
}

.heart.empty { color: #333; }

/* ===========================
   进度条
   =========================== */
.progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s ease;
}

/* ===========================
   导航返回
   =========================== */
.back-btn {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 200;
  color: var(--text-dim);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.back-btn:hover { color: var(--primary); }

/* ===========================
   排行榜
   =========================== */
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}

.leaderboard-table th {
  color: var(--text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  padding: 0.5rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(0,212,255,0.1);
}

.leaderboard-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 0.95rem;
}

.leaderboard-table tr:first-child td { color: var(--gold); }
.leaderboard-table tr:nth-child(2) td { color: #c0c0c0; }
.leaderboard-table tr:nth-child(3) td { color: #cd7f32; }

.rank-medal { font-size: 1.2rem; }

/* ===========================
   设置页
   =========================== */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.setting-label {
  font-size: 1rem;
  color: var(--text);
}

.setting-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

/* 开关 Toggle */
.toggle {
  position: relative;
  width: 52px;
  height: 28px;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: #333;
  border-radius: 28px;
  transition: 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 22px; height: 22px;
  left: 3px; top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: 0.3s;
}

.toggle input:checked + .toggle-slider { background: var(--primary); }
.toggle input:checked + .toggle-slider::before { transform: translateX(24px); }

/* 滑块 */
.range-slider {
  -webkit-appearance: none;
  width: 160px;
  height: 4px;
  border-radius: 2px;
  background: #333;
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(0,212,255,0.6);
}

/* ===========================
   关卡选择
   =========================== */
.level-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  max-width: 600px;
}

.level-card {
  aspect-ratio: 1;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,212,255,0.15);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  color: var(--text);
}

.level-card:hover:not(.locked) {
  background: rgba(0,212,255,0.1);
  border-color: var(--primary);
  transform: scale(1.05);
}

.level-card.locked {
  opacity: 0.4;
  cursor: not-allowed;
}

.level-card.completed {
  border-color: var(--success);
  background: rgba(0,255,136,0.08);
}

.level-num {
  font-size: 1.4rem;
  font-weight: 700;
}

.level-stars {
  font-size: 0.7rem;
  color: var(--gold);
  margin-top: 0.2rem;
}

/* ===========================
   动画
   =========================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 10px rgba(0,212,255,0.3); }
  50% { box-shadow: 0 0 30px rgba(0,212,255,0.7); }
}

.fade-in { animation: fadeIn 0.6s ease forwards; }
.slide-in { animation: slideInLeft 0.5s ease forwards; }

/* ===========================
   游戏画布区域
   =========================== */
#game-canvas-container {
  position: fixed;
  top: 50px; left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

#game-canvas-container canvas {
  display: block;
}

/* ===========================
   游戏 Overlay
   =========================== */
.game-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10,10,26,0.85);
  backdrop-filter: blur(6px);
}

.overlay-panel {
  text-align: center;
  padding: 3rem;
  background: rgba(15,15,46,0.95);
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 16px;
  min-width: 320px;
  animation: fadeIn 0.3s ease;
}

.overlay-title {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.overlay-score {
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 2rem;
}

.overlay-score span {
  color: var(--gold);
  font-size: 2rem;
  font-weight: 700;
}

/* ===========================
   响应式
   =========================== */
@media (max-width: 480px) {
  .level-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .panel {
    padding: 1.5rem;
    margin: 0 1rem;
  }
}