/* ===== 每日热榜与吃瓜导航 - 主样式表 ===== */
/* 暗色高级感 · 卡片化布局 · 移动端优先 */

:root {
  --color-primary: #ff4d4f;
  --color-primary-dark: #d9363e;
  --color-secondary: #faad14;
  --color-accent: #1890ff;
  --color-bg: #0f0f13;
  --color-bg-secondary: #1a1a24;
  --color-card: #1e1e2e;
  --color-card-hover: #262638;
  --color-text: #e8e8ed;
  --color-text-secondary: #a0a0b0;
  --color-text-muted: #6b6b7b;
  --color-border: #2a2a3a;
  --color-success: #52c41a;
  --color-warning: #faad14;
  --color-danger: #ff4d4f;
  --color-rise: #ff4d4f;
  --color-fall: #52c41a;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --transition: 0.25s ease;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", monospace;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --max-width: 1200px;
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-2xl) 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 15, 19, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.site-logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

/* ===== Navigation ===== */
.nav-desktop {
  display: none;
}

.nav-desktop ul {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-desktop a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-primary);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 15, 19, 0.98);
  z-index: 9999;
  padding: var(--spacing-2xl);
  flex-direction: column;
  gap: var(--spacing-lg);
}

.mobile-nav.active {
  display: flex;
}

.mobile-nav-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 1.5rem;
  color: var(--color-text);
  padding: var(--spacing-sm);
}

.mobile-nav a {
  display: block;
  font-size: 1.2rem;
  color: var(--color-text);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

/* ===== Search Bar ===== */
.search-bar {
  position: relative;
  max-width: 400px;
  width: 100%;
}

.search-bar input {
  width: 100%;
  padding: 10px 40px 10px 16px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-bar input:focus {
  border-color: var(--color-primary);
}

.search-bar button {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  font-size: 1rem;
}

.search-suggestions {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 100;
  max-height: 300px;
  overflow-y: auto;
}

.search-suggestions.active {
  display: block;
}

.search-suggestions a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.85rem;
}

.search-suggestions a:hover {
  background: var(--color-card-hover);
}

/* ===== Hero Section ===== */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

/* ===== Cards ===== */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: var(--color-card-hover);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

/* ===== Hot List / Rank ===== */
.hot-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.hot-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background var(--transition);
}

.hot-item:hover {
  background: var(--color-card-hover);
}

.hot-rank {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
}

.hot-rank.top-1 { background: var(--color-primary); color: #fff; }
.hot-rank.top-2 { background: var(--color-secondary); color: #000; }
.hot-rank.top-3 { background: var(--color-accent); color: #fff; }

.hot-content {
  flex: 1;
  min-width: 0;
}

.hot-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hot-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.hot-heat {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  flex-shrink: 0;
}

.trend-up { color: var(--color-rise); }
.trend-down { color: var(--color-fall); }

/* ===== Tag Cloud ===== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.tag-cloud a {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.tag-cloud a:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.tag-cloud a.hot {
  background: rgba(255, 77, 79, 0.15);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
}

.tab-btn {
  padding: 8px 18px;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  white-space: nowrap;
  transition: all var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ===== FAQ ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--color-card-hover);
}

.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--color-text-muted);
  transition: transform var(--transition);
}

.faq-item.active .faq-question::after {
  content: '−';
}

.faq-answer {
  display: none;
  padding: 0 var(--spacing-lg) var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb span {
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.footer-col a {
  display: block;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-bottom a {
  color: var(--color-text-secondary);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 10px 22px;
  border-radius: var(--radius-xl);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

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

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

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
  z-index: 999;
  transition: opacity var(--transition), transform var(--transition);
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  transform: scale(1.1);
  color: #fff;
}

/* ===== PWA Install Banner ===== */
.pwa-banner {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  z-index: 998;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-lg);
}

.pwa-banner.visible {
  display: flex;
}

.pwa-banner-text {
  font-size: 0.85rem;
  color: var(--color-text);
}

.pwa-banner-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.pwa-dismiss {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  padding: 6px 12px;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--color-success);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 10000;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Form ===== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ===== Compliance Notice ===== */
.compliance-notice {
  background: rgba(255, 77, 79, 0.08);
  border: 1px solid rgba(255, 77, 79, 0.2);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-lg);
}

.compliance-notice a {
  color: var(--color-primary);
}

/* ===== Page Content ===== */
.page-content {
  padding: var(--spacing-lg) 0;
}

.page-content h2 {
  font-size: 1.3rem;
  margin: var(--spacing-xl) 0 var(--spacing-md);
  color: var(--color-text);
}

.page-content h3 {
  font-size: 1.1rem;
  margin: var(--spacing-lg) 0 var(--spacing-md);
  color: var(--color-text);
}

.page-content p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.page-content ul,
.page-content ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.page-content li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
  list-style: disc;
}

/* ===== 404 Page ===== */
.error-page {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.error-code {
  font-size: 6rem;
  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;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-top: var(--spacing-lg);
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
  .hero h1 {
    font-size: 2.8rem;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-toggle {
    display: none;
  }

  .nav-desktop {
    display: block;
  }

  .search-bar {
    display: block;
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero h1 {
    font-size: 3.2rem;
  }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }