:root {
  --primary: #f5b041;
  --primary-dark: #d68910;
  --primary-light: #fdebd0;
  --primary-glow: rgba(245, 176, 65, 0.35);
  --text-dark: #1e1e1e;
  --text-mid: #3e3e3e;
  --text-light: #6b6b6b;
  --bg: #ffffff;
  --bg-soft: #fef9f0;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --border: #e8e0d5;
  --border-glass: rgba(255, 255, 255, 0.5);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 32px rgba(245, 176, 65, 0.18);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --max-width: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --gradient-hero: linear-gradient(135deg, #f5b041 0%, #f7dc6f 40%, #fdebd0 100%);
  --gradient-warm: linear-gradient(135deg, #f5b041 0%, #e67e22 100%);
  --gradient-soft: linear-gradient(160deg, #fef9f0 0%, #fdebd0 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(254,249,240,0.95) 100%);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-dark);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  transition: background var(--transition-smooth), color var(--transition-smooth);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ========== 吸顶导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition-fast), background var(--transition-smooth);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-dark);
  text-decoration: none;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
}

.logo svg {
  width: 38px;
  height: 38px;
  filter: drop-shadow(0 2px 6px var(--primary-glow));
  transition: transform var(--transition-bounce);
}

.logo:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-mid);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  white-space: nowrap;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--gradient-warm);
  border-radius: 2px;
  transition: width var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--primary-dark);
}

.nav-links a:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 4px 12px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-smooth);
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  padding: 6px 4px;
  font-size: 0.9rem;
  width: 140px;
  font-family: var(--font);
  color: var(--text-dark);
}

.search-box input::placeholder {
  color: var(--text-light);
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  color: var(--text-light);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
  color: var(--primary-dark);
  transform: scale(1.1);
}

/* 主题切换 */
.theme-toggle {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: background var(--transition-fast), transform var(--transition-bounce), box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--primary-light);
  transform: rotate(20deg) scale(1.08);
  box-shadow: 0 4px 12px var(--primary-glow);
}

/* 移动菜单按钮 */
.mobile-menu-btn {
  display: none;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 10px;
  color: var(--text-dark);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--primary-light);
}

/* 移动导航 */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  padding: 12px 20px 20px;
  gap: 4px;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.mobile-nav a {
  text-decoration: none;
  color: var(--text-mid);
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav a:hover {
  color: var(--primary-dark);
  padding-left: 8px;
}

/* ========== 暗黑模式 ========== */
body.dark {
  --bg: #121212;
  --bg-soft: #1e1e1e;
  --bg-glass: rgba(18, 18, 18, 0.78);
  --text-dark: #eaeaea;
  --text-mid: #cccccc;
  --text-light: #999999;
  --border: #2e2e2e;
  --border-glass: rgba(255, 255, 255, 0.08);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 32px rgba(245, 176, 65, 0.12);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.5);
  --primary-light: #3a2e1a;
  --gradient-hero: linear-gradient(135deg, #3a2e1a 0%, #5a4520 40%, #2a2015 100%);
  --gradient-soft: linear-gradient(160deg, #1e1e1e 0%, #2a2015 100%);
  --gradient-card: linear-gradient(145deg, rgba(30,30,30,0.9) 0%, rgba(42,32,21,0.95) 100%);
}

body.dark .site-header {
  background: var(--bg-glass);
}

body.dark .search-box {
  background: var(--bg-soft);
}

body.dark .theme-toggle {
  background: var(--bg-soft);
}

body.dark .mobile-menu-btn {
  background: var(--bg-soft);
}

/* ========== 面包屑 ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-light);
  margin: 16px 0 8px;
  list-style: none;
}

.breadcrumb li + li::before {
  content: '›';
  margin-right: 6px;
  color: var(--text-light);
}

.breadcrumb a {
  color: var(--text-mid);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ========== Banner轮播 ========== */
.banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 24px 0 32px;
  background: var(--gradient-hero);
  min-height: 320px;
  box-shadow: var(--shadow-glass);
}

.slides {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.slide {
  min-width: 100%;
  padding: 56px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  position: relative;
}

.slide::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.25) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.slide h2 {
  font-size: 2.2rem;
  margin-bottom: 12px;
  color: var(--text-dark);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.slide p {
  font-size: 1.05rem;
  color: var(--text-mid);
  max-width: 600px;
  margin-bottom: 24px;
}

.slide .btn {
  display: inline-block;
  background: var(--gradient-warm);
  color: #ffffff;
  padding: 12px 32px;
  border-radius: 28px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform var(--transition-bounce), box-shadow var(--transition-fast);
  box-shadow: 0 4px 16px rgba(245, 176, 65, 0.4);
  position: relative;
  z-index: 1;
}

.slide .btn:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 8px 24px rgba(245, 176, 65, 0.55);
}

.slide .btn:active {
  transform: translateY(-1px) scale(1.01);
}

.banner-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}

.banner-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), width var(--transition-smooth);
}

.banner-dots button.active {
  background: var(--primary-dark);
  width: 28px;
  border-radius: 6px;
}

.banner-dots button:hover {
  transform: scale(1.2);
}

/* ========== 数字统计 ========== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.stat-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 16px;
  text-align: center;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-warm);
  transform: scaleX(0);
  transition: transform var(--transition-smooth);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  background: var(--gradient-warm);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 6px;
  font-weight: 500;
}

/* ========== 通用板块 ========== */
section {
  margin-bottom: 56px;
}

.section-title {
  font-size: 1.7rem;
  margin-bottom: 8px;
  color: var(--text-dark);
  position: relative;
  padding-left: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  background: var(--gradient-warm);
  border-radius: 3px;
}

.section-sub {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 28px;
  padding-left: 18px;
}

/* ========== 卡片网格 ========== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at top right, var(--primary-glow) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-smooth);
  pointer-events: none;
}

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

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

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--text-dark);
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.card p {
  color: var(--text-mid);
  font-size: 0.95rem;
  position: relative;
  z-index: 1;
}

.card .meta {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  position: relative;
  z-index: 1;
}

.card a {
  color: var(--primary-dark);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.card a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ========== FAQ ========== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px var(--primary-glow);
}

.faq-item.open {
  border-color: var(--primary);
  box-shadow: 0 4px 20px var(--primary-glow);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font);
  transition: background var(--transition-fast);
  gap: 16px;
}

.faq-question:hover {
  background: var(--bg-soft);
}

.faq-question .icon {
  font-size: 1.4rem;
  transition: transform var(--transition-smooth), color var(--transition-fast);
  color: var(--primary-dark);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--primary-light);
}

.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #ffffff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), padding 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  padding: 0 24px;
  color: var(--text-mid);
  font-size: 0.95rem;
  border-top: 0 solid var(--border);
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 18px 24px 24px;
  border-top: 1px solid var(--border);
}

/* ========== 文章列表 ========== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.article-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--gradient-card);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-warm);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-smooth);
}

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

.article-card:hover::after {
  transform: scaleX(1);
}

.article-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  font-weight: 700;
  transition: color var(--transition-fast);
}

.article-card:hover h3 {
  color: var(--primary-dark);
}

.article-card .date {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-card .date::before {
  content: '📅';
  font-size: 0.75rem;
}

.article-card .excerpt {
  font-size: 0.9rem;
  color: var(--text-mid);
  flex: 1;
  line-height: 1.7;
}

.article-card .read-more {
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--primary-dark);
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.article-card .read-more:hover {
  gap: 8px;
  color: var(--primary);
}

/* ========== HowTo ========== */
.howto-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  counter-reset: step;
}

.howto-step {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: var(--gradient-soft);
  border-radius: var(--radius);
  padding: 22px 24px;
  border: 1px solid var(--border);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.howto-step .step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-warm);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
  font-size: 0.95rem;
  box-shadow: 0 4px 12px var(--primary-glow);
  transition: transform var(--transition-bounce);
}

.howto-step:hover .step-num {
  transform: scale(1.15) rotate(-8deg);
}

.howto-step h4 {
  margin-bottom: 6px;
  font-size: 1rem;
  font-weight: 700;
}

.howto-step p {
  font-size: 0.92rem;
  color: var(--text-mid);
  line-height: 1.7;
}

/* ========== 页脚 ========== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 28px;
  margin-top: 56px;
  background: var(--gradient-soft);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-warm);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 36px;
  margin-bottom: 36px;
}

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-dark);
  font-weight: 700;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--gradient-warm);
  border-radius: 1px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-mid);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.footer-col a:hover {
  color: var(--primary-dark);
  padding-left: 6px;
}

.footer-col p {
  font-size: 0.9rem;
  color: var(--text-mid);
  margin-bottom: 8px;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-light);
}

.footer-bottom a {
  color: var(--text-light);
  text-decoration: none;
  margin-left: 16px;
  transition: color var(--transition-fast);
}

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

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-warm);
  color: #ffffff;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(245, 176, 65, 0.45);
  z-index: 900;
  transition: opacity var(--transition-smooth), transform var(--transition-bounce), box-shadow var(--transition-fast);
}

.back-to-top.visible {
  display: flex;
  animation: popIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.5);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 10px 28px rgba(245, 176, 65, 0.6);
}

.back-to-top:active {
  transform: translateY(-2px) scale(1.02);
}

/* ========== 滚动动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.7s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 通用工具 ========== */
.tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--primary-dark);
  border-radius: 20px;
  padding: 4px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  border: 1px solid rgba(245, 176, 65, 0.3);
  position: relative;
  z-index: 1;
}

body.dark .tag {
  background: rgba(58, 46, 26, 0.8);
  color: var(--primary);
}

.text-center {
  text-align: center;
}

.mt-16 {
  margin-top: 16px;
}

.mb-16 {
  margin-bottom: 16px;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .nav-links {
    gap: 16px;
  }
  .nav-links a {
    font-size: 0.88rem;
  }
  .search-box input {
    width: 110px;
  }
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .search-box input {
    width: 100px;
  }
  .slide h2 {
    font-size: 1.6rem;
  }
  .slide {
    padding: 40px 28px;
  }
  .slide p {
    font-size: 1rem;
  }
  .banner {
    min-height: 280px;
  }
  .stat-number {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 600px) {
  .search-box {
    display: none;
  }
  .header-actions {
    gap: 8px;
  }
  .banner {
    min-height: 240px;
    border-radius: var(--radius);
  }
  .slide {
    padding: 32px 20px;
  }
  .slide h2 {
    font-size: 1.3rem;
  }
  .slide p {
    font-size: 0.92rem;
    margin-bottom: 18px;
  }
  .slide .btn {
    padding: 10px 24px;
    font-size: 0.9rem;
  }
  .stat-number {
    font-size: 1.7rem;
  }
  .stat-card {
    padding: 20px 12px;
  }
  .card {
    padding: 20px;
  }
  .section-title {
    font-size: 1.35rem;
  }
  .section-sub {
    font-size: 0.88rem;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
  .faq-question {
    padding: 16px 18px;
    font-size: 0.95rem;
  }
  .faq-answer {
    padding: 0 18px;
  }
  .faq-item.open .faq-answer {
    padding: 14px 18px 18px;
  }
  .howto-step {
    padding: 18px;
    gap: 14px;
  }
  .howto-step .step-num {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }
  .article-card {
    padding: 20px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .footer-bottom a {
    margin-left: 8px;
  }
}

@media (max-width: 380px) {
  .slide h2 {
    font-size: 1.15rem;
  }
  .stat-number {
    font-size: 1.5rem;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .article-list {
    grid-template-columns: 1fr;
  }
}

/* ========== 减少动画偏好 ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ========== 打印样式 ========== */
@media print {
  .site-header,
  .back-to-top,
  .banner,
  .mobile-nav,
  .theme-toggle,
  .search-box,
  .mobile-menu-btn {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .card,
  .article-card,
  .faq-item {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* ========== 选中文本样式 ========== */
::selection {
  background: var(--primary);
  color: #1e1e1e;
}

::-moz-selection {
  background: var(--primary);
  color: #1e1e1e;
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-soft);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
  border: 2px solid var(--bg-soft);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* ========== 焦点可见性 ========== */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}