/* ==========================================
   地震逃生模拟器 — 共享样式
   暗色紧张氛围 · 现代卡片UI · 移动端响应式
   ========================================== */

/* —— CSS 自定义属性 (主题色) —— */
:root {
  --color-bg: #0f1923;
  --color-bg-card: #1a2733;
  --color-bg-card-hover: #1f2e3c;
  --color-primary: #e63946;
  --color-primary-glow: #ff6b6b;
  --color-accent: #f4a261;
  --color-safe: #2a9d8f;
  --color-text: #e0e0e0;
  --color-text-dim: #8899aa;
  --color-text-bright: #ffffff;
  --color-border: #2a3a4a;
  --color-overlay: rgba(0, 0, 0, 0.75);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(230, 57, 70, 0.3);
  --transition: 0.25s 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);
  background: var(--color-bg);
  background-image:
    radial-gradient(ellipse at 50% 0%, rgba(230, 57, 70, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(244, 162, 97, 0.05) 0%, transparent 50%);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* —— 语义化布局 —— */
header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem 3rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

/* —— 导航 —— */
nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.5rem 1rem;
}

nav a {
  color: var(--color-text-dim);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  font-size: 0.9rem;
}

nav a:hover,
nav a.active {
  color: var(--color-text-bright);
  background: rgba(255, 255, 255, 0.06);
}

/* —— 标题渐变文字 —— */
.gradient-title {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-glow), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  margin-bottom: 0.3rem;
}

.subtitle {
  color: var(--color-text-dim);
  font-size: 1rem;
  font-weight: 400;
}

/* —— 卡片 —— */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

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

.card:active {
  transform: translateY(-1px);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

/* —— 按钮 —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.6rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-stack);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
  color: var(--color-text-bright);
  user-select: none;
}

.btn-primary {
  background: var(--color-primary);
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.35);
}

.btn-primary:hover {
  background: #d62839;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(230, 57, 70, 0.3);
}

.btn-secondary {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-text-dim);
}

.btn-safe {
  background: var(--color-safe);
  box-shadow: 0 4px 14px rgba(42, 157, 143, 0.3);
}

.btn-safe:hover {
  background: #238b7d;
  transform: translateY(-2px);
}

.btn-large {
  padding: 1rem 2.5rem;
  font-size: 1.2rem;
  border-radius: var(--radius);
}

/* —— 表单元素 —— */
label {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-dim);
  margin-bottom: 0.3rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--color-primary);
}

select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-stack);
  font-size: 0.95rem;
  cursor: pointer;
}

/* —— 提示 / 标签 —— */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-danger {
  background: rgba(230, 57, 70, 0.2);
  color: var(--color-primary-glow);
}

.badge-safe {
  background: rgba(42, 157, 143, 0.2);
  color: var(--color-safe);
}

/* —— 震动动画 (JS 触发) —— */
@keyframes shake {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-4px, 3px); }
  20% { transform: translate(5px, -2px); }
  30% { transform: translate(-6px, -4px); }
  40% { transform: translate(3px, 5px); }
  50% { transform: translate(-2px, -3px); }
  60% { transform: translate(6px, 1px); }
  70% { transform: translate(-5px, 4px); }
  80% { transform: translate(2px, -5px); }
  90% { transform: translate(-3px, 2px); }
}

.shaking {
  animation: shake 0.5s ease-in-out infinite;
}

/* —— 淡入动画 —— */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

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

/* —— 脉冲警示 —— */
@keyframes pulse-warn {
  0%, 100% { box-shadow: 0 0 0 0 rgba(230, 57, 70, 0.5); }
  50% { box-shadow: 0 0 0 12px rgba(230, 57, 70, 0); }
}

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

/* —— 黑白滤镜 (慢镜头回放) —— */
.grayscale-overlay {
  filter: grayscale(100%) brightness(0.7);
  transition: filter 0.8s ease;
}

/* —— Canvas 容器 —— */
.canvas-container {
  position: relative;
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.canvas-container canvas {
  display: block;
  width: 100%;
  height: auto;
}

/* —— 双人面板 —— */
.split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 700px) {
  .split-panel {
    grid-template-columns: 1fr;
  }
}

/* —— 工具类 —— */
.text-center { text-align: center; }
.text-dim { color: var(--color-text-dim); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: 0.5rem; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-col { display: flex; flex-direction: column; }

/* —— 响应式 —— */
@media (max-width: 600px) {
  .gradient-title { font-size: 1.6rem; }
  .card { padding: 1rem; }
  .btn-large { padding: 0.8rem 1.8rem; font-size: 1rem; }
  main { padding: 0.75rem 1rem 2rem; }
}