/* ============================================
   地震模拟器 — 电梯被困安全教育
   共享样式表 (所有页面引用)
   ============================================ */

/* ----- 自定义属性 (主题色) ----- */
:root {
  --color-bg-start: #0f172a;
  --color-bg-end: #1e293b;
  --color-surface: #1e293b;
  --color-surface-hover: #273548;
  --color-card: #1a2332;
  --color-card-border: #2a3a4e;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-primary: #f59e0b;
  --color-primary-hover: #fbbf24;
  --color-danger: #ef4444;
  --color-danger-hover: #f87171;
  --color-success: #10b981;
  --color-accent: #f97316;
  --color-accent-glow: rgba(249, 115, 22, 0.3);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-btn: 0 2px 8px rgba(0, 0, 0, 0.3);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

/* ----- 全局重置 ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: linear-gradient(160deg, var(--color-bg-start) 0%, var(--color-bg-end) 50%, #0c1929 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ----- 导航栏 (所有子页面顶部) ----- */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-card-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav .nav-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav .nav-links {
  display: flex;
  gap: 16px;
  list-style: none;
}

.site-nav .nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav .nav-links a:hover,
.site-nav .nav-links a.active {
  color: var(--color-primary);
  background: rgba(245, 158, 11, 0.1);
}

/* ----- 主容器 ----- */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

/* ----- 页面标题 ----- */
.page-title {
  text-align: center;
  margin-bottom: 40px;
}

.page-title h1 {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.page-title p {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* ----- 卡片 ----- */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.card h2,
.card h3 {
  color: var(--color-text);
  margin-bottom: 12px;
}

.card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ----- 卡片网格 ----- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-stack);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
  box-shadow: var(--shadow-btn);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #1a1a2e;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background: var(--color-danger-hover);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: rgba(245, 158, 11, 0.1);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* ----- 警示脉冲动画 ----- */
@keyframes pulse-warning {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.pulse {
  animation: pulse-warning 1.5s ease-in-out infinite;
}

/* ----- 渐入动画 ----- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.5s ease forwards;
}

.fade-in-1 { animation-delay: 0.1s; }
.fade-in-2 { animation-delay: 0.2s; }
.fade-in-3 { animation-delay: 0.3s; }
.fade-in-4 { animation-delay: 0.4s; }

/* ----- 警示横幅 ----- */
.alert {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.12);
  border-left: 4px solid var(--color-primary);
  color: var(--color-primary-hover);
}

.alert-danger {
  background: rgba(239, 68, 68, 0.12);
  border-left: 4px solid var(--color-danger);
  color: var(--color-danger-hover);
}

.alert-success {
  background: rgba(16, 185, 129, 0.12);
  border-left: 4px solid var(--color-success);
  color: var(--color-success);
}

/* ----- 首页电梯场景展示 ----- */
.hero-elevator {
  background: linear-gradient(180deg, #0d1520 0%, #162032 50%, #1a1f2e 100%);
  border: 2px solid #2a3a4e;
  border-radius: var(--radius-lg);
  padding: 32px 24px 24px;
  text-align: center;
  margin-bottom: 32px;
  box-shadow: inset 0 0 60px rgba(0,0,0,0.5), var(--shadow-card);
}

.hero-doors {
  display: flex;
  justify-content: center;
  gap: 0;
  max-width: 300px;
  margin: 0 auto 20px;
}

.hero-door {
  width: 50%;
  height: 140px;
  background: linear-gradient(180deg, #3a4a5c, #2a3a4e);
  border: 2px solid #4a5a6e;
}

.hero-door-left {
  border-radius: 8px 0 0 8px;
  border-right: 1px solid #4a5a6e;
}

.hero-door-right {
  border-radius: 0 8px 8px 0;
  border-left: 1px solid #4a5a6e;
}

.hero-people {
  display: flex;
  justify-content: center;
  gap: 16px;
  font-size: 2.2rem;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.hero-person {
  transition: transform 0.3s ease;
}

.hero-person:hover {
  transform: translateY(-4px);
}

.hero-hint {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin: 0;
}

/* ----- 页脚 ----- */
.site-footer {
  text-align: center;
  padding: 24px;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--color-card-border);
  margin-top: 40px;
}

/* ----- 响应式 ----- */
@media (max-width: 640px) {
  .container {
    padding: 20px 14px 40px;
  }

  .page-title h1 {
    font-size: 1.6rem;
  }

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

  .site-nav {
    flex-direction: column;
    gap: 10px;
    padding: 12px 16px;
  }

  .site-nav .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .btn-lg {
    padding: 14px 24px;
    font-size: 1rem;
  }
}