/* ============================================
   校园安全小卫士 — 共享样式表
   卡通 / 明亮安全 / 圆角柔和 / 微动效
   ============================================ */

/* --- CSS 自定义属性（主题色） --- */
:root {
  --color-primary: #4f8cff;
  --color-primary-hover: #3a73e0;
  --color-secondary: #ffb347;
  --color-success: #4caf50;
  --color-danger: #ff6b6b;
  --color-warning: #ffa726;
  --color-bg-start: #1a1a2e;
  --color-bg-end: #16213e;
  --color-card-bg: rgba(255, 255, 255, 0.08);
  --color-card-border: rgba(255, 255, 255, 0.12);
  --color-text: #e8e8e8;
  --color-text-dim: #a0a0b0;
  --color-text-bright: #ffffff;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.25);
  --transition-fast: 0.2s ease;
  --transition-med: 0.3s 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", "Noto Sans SC", sans-serif;
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  padding: 0;
  margin: 0;
}

/* --- 导航栏 --- */
.nav-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-card-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-bar .back-link {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.nav-bar .back-link:hover {
  background: rgba(79, 140, 255, 0.15);
}

.nav-bar .page-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-bright);
  flex: 1;
  text-align: center;
  margin-right: 40px;
}

/* --- 渐变标题 --- */
.gradient-title {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin: 20px 0 10px;
}

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

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  padding: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
  color: var(--color-text-bright);
}

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

.btn-primary {
  background: var(--color-primary);
  box-shadow: 0 4px 14px rgba(79, 140, 255, 0.35);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 6px 20px rgba(79, 140, 255, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-secondary);
  color: #1a1a2e;
  box-shadow: 0 4px 14px rgba(255, 179, 71, 0.35);
}

.btn-secondary:hover {
  box-shadow: 0 6px 20px rgba(255, 179, 71, 0.5);
  transform: translateY(-2px);
}

.btn-success {
  background: var(--color-success);
  box-shadow: 0 4px 14px rgba(76, 175, 80, 0.35);
}

.btn-success:hover {
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.5);
  transform: translateY(-2px);
}

.btn-danger {
  background: var(--color-danger);
  box-shadow: 0 4px 14px rgba(255, 107, 107, 0.35);
}

.btn-danger:hover {
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.5);
  transform: translateY(-2px);
}

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

/* --- 容器 --- */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

/* --- 内容区域 --- */
.content-section {
  margin: 24px 0;
}

.content-section h2 {
  font-size: 1.4rem;
  color: var(--color-secondary);
  margin-bottom: 12px;
  border-left: 4px solid var(--color-secondary);
  padding-left: 12px;
}

.content-section p, .content-section li {
  color: var(--color-text);
  margin-bottom: 10px;
  font-size: 1rem;
  line-height: 1.8;
}

/* --- 列表 --- */
.styled-list {
  list-style: none;
  padding: 0;
}

.styled-list li {
  padding: 10px 16px;
  margin-bottom: 8px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
  transition: background var(--transition-fast);
}

.styled-list li:hover {
  background: rgba(79, 140, 255, 0.1);
}

/* --- 提示框 --- */
.tip-box {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 16px 0;
  border-left: 5px solid;
}

.tip-box.info {
  background: rgba(79, 140, 255, 0.12);
  border-color: var(--color-primary);
}

.tip-box.success {
  background: rgba(76, 175, 80, 0.12);
  border-color: var(--color-success);
}

.tip-box.warning {
  background: rgba(255, 167, 38, 0.12);
  border-color: var(--color-warning);
}

.tip-box.danger {
  background: rgba(255, 107, 107, 0.12);
  border-color: var(--color-danger);
}

/* --- 小人动画容器 --- */
.character-stage {
  width: 100%;
  max-width: 500px;
  height: 200px;
  margin: 16px auto;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

/* --- 响应式 --- */
@media (max-width: 600px) {
  .gradient-title {
    font-size: 1.5rem;
  }
  .card-grid {
    grid-template-columns: 1fr;
    padding: 12px;
  }
  .container {
    padding: 12px;
  }
  .nav-bar .page-title {
    font-size: 0.95rem;
    margin-right: 0;
  }
}

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

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

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

/* --- 入口卡片（首页用） --- */
.entry-card {
  text-align: center;
  padding: 32px 20px;
  cursor: pointer;
}

.entry-card .icon {
  font-size: 3rem;
  margin-bottom: 12px;
  display: block;
}

.entry-card h3 {
  font-size: 1.2rem;
  color: var(--color-text-bright);
  margin-bottom: 8px;
}

.entry-card p {
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

/* --- 页脚 --- */
.footer {
  text-align: center;
  padding: 30px 20px;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-card-border);
  margin-top: 40px;
}