/* ============================================
   地震安全教育网站 — 共享样式表
   暗色科技风 · 卡通友好 · 微动效
   ============================================ */

/* ----- CSS 自定义属性 (主题色) ----- */
:root {
  --color-bg-start: #0a0e27;       /* 背景渐变起点 (深蓝) */
  --color-bg-end: #1a1040;         /* 背景渐变终点 (深紫) */
  --color-primary: #4fc3f7;        /* 主色调 (亮蓝) */
  --color-primary-glow: #29b6f6;   /* 发光蓝 */
  --color-accent: #ff8a65;         /* 强调色 (暖橙) */
  --color-success: #66bb6a;        /* 正确/安全 (绿) */
  --color-danger: #ef5350;         /* 错误/危险 (红) */
  --color-warning: #ffa726;        /* 警告 (橙) */
  --color-card-bg: rgba(255,255,255,0.06);  /* 卡片半透明底 */
  --color-card-border: rgba(255,255,255,0.10);
  --color-text: #e0e0e0;           /* 正文文字 */
  --color-text-dim: #a0a0b0;       /* 次要文字 */
  --color-text-bright: #ffffff;    /* 标题文字 */
  --radius: 16px;                  /* 圆角 */
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: linear-gradient(135deg, var(--color-bg-start) 0%, var(--color-bg-end) 100%);
  background-attachment: fixed;
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ----- 渐变标题文字 ----- */
.gradient-title {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), #ce93d8, var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
  margin-bottom: 0.5rem;
}

/* ----- 导航栏 ----- */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.5rem;
  background: rgba(10, 14, 39, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-card-border);
  position: sticky;
  top: 0;
  z-index: 100;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.navbar .logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.navbar .nav-links {
  display: flex;
  gap: 1rem;
  list-style: none;
  flex-wrap: wrap;
}

.navbar .nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 0.7rem;
  border-radius: 8px;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.navbar .nav-links a:hover,
.navbar .nav-links a.active {
  color: var(--color-primary);
  background: rgba(79, 195, 247, 0.1);
}

.navbar .score-badge {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 600;
}

/* ----- 主容器 ----- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

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

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(79, 195, 247, 0.15);
}

.card h2, .card h3 {
  color: var(--color-text-bright);
  margin-bottom: 0.6rem;
}

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

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
  font-family: inherit;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-glow));
  color: #0a0e27;
}

.btn-primary:hover {
  box-shadow: 0 4px 20px rgba(79, 195, 247, 0.4);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #ff7043);
  color: #fff;
}

.btn-accent:hover {
  box-shadow: 0 4px 20px rgba(255, 138, 101, 0.4);
}

.btn-success {
  background: linear-gradient(135deg, var(--color-success), #43a047);
  color: #fff;
}

.btn-danger {
  background: linear-gradient(135deg, var(--color-danger), #e53935);
  color: #fff;
}

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

.btn-outline:hover {
  background: rgba(79, 195, 247, 0.1);
}

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

/* ----- 网格布局 ----- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

/* ----- 勋章 ----- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.7rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(255, 138, 101, 0.15);
  color: var(--color-accent);
  border: 1px solid rgba(255, 138, 101, 0.3);
}

.badge.gold {
  background: rgba(255, 215, 0, 0.15);
  color: #ffd700;
  border-color: rgba(255, 215, 0, 0.3);
}

/* ----- 进度条 ----- */
.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* ----- 提示框 ----- */
.toast {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.8rem 1.2rem;
  border-radius: 10px;
  font-weight: 600;
  z-index: 200;
  animation: slideIn 0.3s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.toast.success { background: var(--color-success); color: #fff; }
.toast.error { background: var(--color-danger); color: #fff; }
.toast.info { background: var(--color-primary); color: #0a0e27; }

@keyframes slideIn {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ----- 模态弹层 ----- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 150;
  animation: fadeIn 0.2s ease;
}

.modal-box {
  background: #1a1f3a;
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 480px;
  width: 90%;
  text-align: center;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.modal-box h2 {
  color: var(--color-text-bright);
  margin-bottom: 1rem;
}

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

/* ----- 页脚 ----- */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-card-border);
  margin-top: 2rem;
}

/* ----- 响应式 ----- */
@media (max-width: 768px) {
  .gradient-title { font-size: 1.6rem; }
  .navbar { padding: 0.6rem 1rem; }
  .navbar .nav-links { gap: 0.4rem; }
  .navbar .nav-links a { font-size: 0.8rem; padding: 0.3rem 0.5rem; }
  .container { padding: 1.2rem 1rem; }
  .card { padding: 1.2rem; }
}

@media (max-width: 480px) {
  .navbar { flex-direction: column; align-items: flex-start; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}