/* ============================================
   应急与安全小游戏 — 共享样式表
   暗色科幻风 · 霓虹警示色 · 移动端优先
   ============================================ */

/* --- 自定义属性（主题色） --- */
:root {
  --color-bg: #0b0d1a;
  --color-bg-card: #13162b;
  --color-bg-card-hover: #1a1e3a;
  --color-primary: #ff6b35;
  --color-primary-hover: #ff8555;
  --color-accent: #00d4ff;
  --color-accent-hover: #33ddff;
  --color-danger: #ff2d55;
  --color-success: #34c759;
  --color-warning: #ffcc00;
  --color-text: #e8e8f0;
  --color-text-dim: #9898b0;
  --color-border: #2a2d4a;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(255, 107, 53, 0.15);
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 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: linear-gradient(145deg, #0b0d1a 0%, #11142b 50%, #0d0f22 100%);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  padding: 0 16px 40px;
}

/* --- 渐变标题 --- */
.gradient-title {
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

/* --- 导航栏 --- */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  max-width: 960px;
  margin: 0 auto 24px;
  border-bottom: 1px solid var(--color-border);
}

.nav-bar .logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
}

.nav-bar .nav-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.nav-bar .nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-bar .nav-links a:hover {
  color: var(--color-accent);
  background: rgba(0, 212, 255, 0.08);
}

/* --- 卡片 --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--color-primary);
}

.card:hover::before {
  opacity: 1;
}

.card:active {
  transform: translateY(-1px) scale(0.98);
}

.card-icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 6px;
  color: var(--color-text);
}

.card p {
  font-size: 0.88rem;
  color: var(--color-text-dim);
  line-height: 1.5;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-stack);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
}

.btn-primary:active {
  transform: translateY(0) scale(0.97);
}

.btn-accent {
  background: var(--color-accent);
  color: #0b0d1a;
}

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* --- 返回链接 --- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.88rem;
  margin-bottom: 16px;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--color-accent);
}

/* --- 游戏容器 --- */
.game-container {
  max-width: 720px;
  margin: 0 auto;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  min-height: 320px;
}

.game-container h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

/* --- 选项按钮（选择题用） --- */
.option-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 14px 18px;
  margin-bottom: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-stack);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}

.option-btn:hover {
  background: rgba(0, 212, 255, 0.06);
  border-color: var(--color-accent);
}

.option-btn.correct {
  background: rgba(52, 199, 89, 0.15);
  border-color: var(--color-success);
  color: var(--color-success);
}

.option-btn.wrong {
  background: rgba(255, 45, 85, 0.15);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.option-btn:disabled {
  cursor: default;
  opacity: 0.7;
}

/* --- 反馈文字 --- */
.feedback {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  display: none;
}

.feedback.show {
  display: block;
}

.feedback.good {
  background: rgba(52, 199, 89, 0.1);
  border-left: 3px solid var(--color-success);
  color: var(--color-success);
}

.feedback.bad {
  background: rgba(255, 45, 85, 0.1);
  border-left: 3px solid var(--color-danger);
  color: var(--color-danger);
}

.feedback.info {
  background: rgba(0, 212, 255, 0.08);
  border-left: 3px solid var(--color-accent);
  color: var(--color-accent);
}

/* --- 分数/进度条 --- */
.score-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.score-bar .score {
  color: var(--color-accent);
  font-weight: 700;
}

.progress-track {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  margin-bottom: 20px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* --- 页脚 --- */
footer {
  text-align: center;
  padding: 32px 0 16px;
  color: var(--color-text-dim);
  font-size: 0.8rem;
  max-width: 960px;
  margin: 0 auto;
}

/* --- 响应式 --- */
@media (max-width: 600px) {
  body {
    padding: 0 12px 32px;
  }

  .nav-bar {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }

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

  .game-container {
    padding: 20px 16px;
  }

  .option-btn {
    padding: 12px 14px;
    font-size: 0.9rem;
  }
}