/* ===== 生活片社区 完整样式表 ===== */
/* 设计风格：现代毛玻璃 + 渐变 + 圆角卡片 + 响应式 + 暗色模式 */

/* ---------- CSS Reset & 变量 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #f6f8fa;
  --bg-gradient: radial-gradient(ellipse at 20% 0%, rgba(43, 79, 110, 0.08) 0%, transparent 60%), radial-gradient(ellipse at 80% 20%, rgba(224, 122, 95, 0.08) 0%, transparent 50%);
  --card: rgba(255, 255, 255, 0.85);
  --card-solid: #ffffff;
  --text: #1e2b3c;
  --text-light: #5a6b7a;
  --brand: #2b4f6e;
  --brand-light: #3a6b8f;
  --accent: #e07a5f;
  --accent-light: #f09b82;
  --border: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-bg: rgba(255, 255, 255, 0.72);
  --footer-bg: #1a2634;
  --scrollbar-thumb: #cbd5e1;
  --scrollbar-track: transparent;
}

/* ---------- 暗色模式变量 ---------- */
.dark-mode {
  --bg: #0f172a;
  --bg-gradient: radial-gradient(ellipse at 20% 0%, rgba(165, 216, 255, 0.06) 0%, transparent 60%), radial-gradient(ellipse at 80% 20%, rgba(224, 122, 95, 0.06) 0%, transparent 50%);
  --card: rgba(30, 41, 59, 0.85);
  --card-solid: #1e293b;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --brand: #a5d8ff;
  --brand-light: #7ab8e8;
  --border: #334155;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --nav-bg: rgba(15, 23, 42, 0.7);
  --footer-bg: #0b1220;
  --scrollbar-thumb: #475569;
}

/* ---------- 基础样式 ---------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  background-image: var(--bg-gradient);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: var(--transition);
  overflow-x: hidden;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 20px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--brand-light);
  background-clip: content-box;
}

/* 选中文本 */
::selection {
  background: var(--accent);
  color: #fff;
}

/* 容器 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* ---------- 导航栏 ---------- */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.05);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  gap: 16px;
}

.logo {
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--brand);
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  letter-spacing: 0.5px;
  transition: var(--transition);
  flex-shrink: 0;
}

.logo:hover {
  transform: scale(1.02);
}

.logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 4px rgba(43, 79, 110, 0.2));
  transition: var(--transition);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--card);
  border-radius: 30px;
  padding: 6px 16px;
  border: 1px solid var(--border);
  transition: var(--transition);
  backdrop-filter: blur(8px);
  flex-shrink: 1;
  max-width: 240px;
}

.search-box:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(43, 79, 110, 0.1);
}

.search-box input {
  border: none;
  outline: none;
  padding: 6px 8px;
  width: 100%;
  background: transparent;
  color: var(--text);
  font-size: 0.9rem;
}

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

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--brand);
  font-size: 1.1rem;
  transition: var(--transition);
  padding: 2px;
}

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

.menu-toggle {
  display: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text);
  background: none;
  border: none;
  transition: var(--transition);
  padding: 4px;
  line-height: 1;
}

.menu-toggle:hover {
  color: var(--accent);
}

/* ---------- Hero 首屏 ---------- */
.hero {
  background: linear-gradient(145deg, rgba(233, 240, 245, 0.9) 0%, rgba(217, 228, 238, 0.9) 100%);
  padding: 60px 0;
  border-radius: 0 0 48px 48px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.dark-mode .hero {
  background: linear-gradient(145deg, rgba(30, 41, 59, 0.9) 0%, rgba(15, 23, 42, 0.9) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(224, 122, 95, 0.12) 0%, transparent 60%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(43, 79, 110, 0.1) 0%, transparent 60%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-grid {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 1;
  min-width: 280px;
}

.hero-text h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
  color: var(--brand);
  margin-bottom: 1rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.dark-mode .hero-text h1 {
  color: var(--brand);
}

.hero-text p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 600px;
  margin-bottom: 1.8rem;
  color: var(--text-light);
  line-height: 1.7;
}

.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  padding: 13px 32px;
  border-radius: 40px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(224, 122, 95, 0.3);
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(224, 122, 95, 0.4);
}

.hero-svg {
  flex-shrink: 0;
  transition: var(--transition);
  animation: float 6s ease-in-out infinite;
}

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

/* ---------- Banner 轮播 ---------- */
.banner-carousel {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  margin: 32px 0;
  overflow: hidden;
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.carousel-track {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.carousel-track::-webkit-scrollbar {
  height: 6px;
}

.carousel-track::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 10px;
}

.carousel-item {
  min-width: 280px;
  max-width: 320px;
  scroll-snap-align: start;
  background: linear-gradient(135deg, rgba(241, 245, 249, 0.9), rgba(226, 232, 240, 0.9));
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.dark-mode .carousel-item {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(51, 65, 85, 0.9));
}

.carousel-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.carousel-item h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
}

.carousel-item p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.5;
}

/* ---------- 区块标题 ---------- */
.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--brand);
  margin: 48px 0 24px;
  border-left: 6px solid var(--accent);
  padding-left: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 16px;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 3px;
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-top: 4px solid var(--brand);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-top-width: 4px;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(43, 79, 110, 0.05) 0%, transparent 60%);
  border-radius: 50%;
  pointer-events: none;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--accent);
}

.card:hover::before {
  transform: scale(1.5);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text);
  font-weight: 600;
}

.card h4 {
  font-size: 1rem;
  margin: 16px 0 8px;
  color: var(--brand);
}

.card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.card strong {
  color: var(--text);
  font-weight: 600;
}

.card time {
  font-size: 0.85rem;
  color: var(--text-light);
  opacity: 0.8;
}

.card a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
  display: inline-block;
  margin-top: 8px;
}

.card a:hover {
  color: var(--brand);
  transform: translateX(4px);
}

/* ---------- 数字统计 ---------- */
.stats-section {
  display: flex;
  gap: 3rem;
  justify-content: center;
  margin: 48px 0;
  flex-wrap: wrap;
  padding: 32px;
  background: var(--card);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

.stat-item {
  text-align: center;
  min-width: 120px;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--accent), var(--brand));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 4px;
  font-weight: 500;
}

/* ---------- FAQ ---------- */
.faq-grid {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

details {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
  border-radius: var(--radius-sm);
}

details:last-child {
  border-bottom: none;
}

details:hover {
  background: rgba(43, 79, 110, 0.03);
}

.dark-mode details:hover {
  background: rgba(165, 216, 255, 0.03);
}

details summary {
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text);
  transition: var(--transition);
  list-style: none;
  position: relative;
  padding-right: 30px;
  font-weight: 500;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--accent);
  transition: var(--transition);
  font-weight: 300;
}

details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
  color: var(--brand);
}

details summary:hover {
  color: var(--accent);
}

details p {
  padding-top: 12px;
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- HowTo ---------- */
.howto-grid {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.howto-grid h3 {
  font-size: 1.1rem;
  color: var(--brand);
  margin: 24px 0 8px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.howto-grid h3:first-child {
  margin-top: 0;
}

.howto-grid p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.howto-grid ol {
  padding-left: 24px;
  margin: 8px 0;
}

.howto-grid ol li {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 2;
  position: relative;
}

.howto-grid ol li::marker {
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 友情链接 ---------- */
.link-section {
  margin: 48px 0;
}

.link-box {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  background: var(--card);
  padding: 24px;
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.link-box a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 8px 16px;
  border-radius: 20px;
  background: rgba(43, 79, 110, 0.05);
  transition: var(--transition);
  border: 1px solid transparent;
}

.dark-mode .link-box a {
  background: rgba(165, 216, 255, 0.05);
}

.link-box a:hover {
  color: var(--accent);
  background: rgba(224, 122, 95, 0.08);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.link-box span {
  width: 100%;
  height: 0;
}

/* ---------- 联系我们 ---------- */
.contact-card {
  background: var(--card);
  border-radius: var(--radius-md);
  padding: 28px;
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.contact-card h3 {
  font-size: 1.1rem;
  color: var(--brand);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.contact-card p {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ---------- Footer ---------- */
footer {
  background: var(--footer-bg);
  color: #cbd5e1;
  padding: 48px 0 24px;
  margin-top: 80px;
  position: relative;
  transition: var(--transition);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin-bottom: 24px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.92rem;
  transition: var(--transition);
  padding: 4px 8px;
  border-radius: 6px;
}

.footer-links a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.footer-copy {
  text-align: center;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: #94a3b8;
}

.legal {
  text-align: center;
  font-size: 0.82rem;
  color: #64748b;
  border-top: 1px solid #334155;
  padding-top: 20px;
  line-height: 1.8;
}

/* ---------- 返回顶部 ---------- */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  font-size: 1.2rem;
  border: none;
  z-index: 999;
}

.scroll-top.visible {
  opacity: 0.9;
  visibility: visible;
}

.scroll-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  opacity: 1;
}

/* ---------- 暗色模式按钮 ---------- */
.dark-mode-toggle {
  position: fixed;
  bottom: 90px;
  right: 30px;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  font-size: 1.2rem;
  border: none;
  z-index: 999;
}

.dark-mode-toggle:hover {
  transform: translateY(-4px) rotate(15deg);
  box-shadow: var(--shadow-lg);
}

/* ---------- 懒加载图片占位 ---------- */
.lazy-img {
  background: linear-gradient(135deg, var(--border), rgba(226, 232, 240, 0.5));
  border-radius: var(--radius-sm);
  min-height: 100px;
  position: relative;
  overflow: hidden;
}

.lazy-img::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  100% { left: 100%; }
}

/* ---------- 滚动动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
  .hero-grid {
    gap: 2rem;
  }
  
  .hero-text h1 {
    font-size: 2.2rem;
  }
  
  .nav-links {
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .nav-wrap {
    padding: 10px 16px;
  }
  
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--card);
    backdrop-filter: blur(20px);
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s ease;
  }
  
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .nav-links a {
    font-size: 1.05rem;
    padding: 8px 0;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .search-box {
    max-width: 140px;
  }
  
  .search-box input {
    width: 90px;
  }
  
  .hero {
    padding: 40px 0;
    border-radius: 0 0 32px 32px;
  }
  
  .hero-text h1 {
    font-size: 1.8rem;
  }
  
  .hero-text p {
    font-size: 1rem;
  }
  
  .hero-svg {
    display: none;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .carousel-item {
    min-width: 240px;
  }
  
  .stats-section {
    gap: 2rem;
    padding: 24px 16px;
  }
  
  .stat-number {
    font-size: 1.8rem;
  }
  
  .section-title {
    font-size: 1.4rem;
  }
  
  .faq-grid,
  .howto-grid {
    padding: 20px;
  }
  
  .scroll-top,
  .dark-mode-toggle {
    width: 42px;
    height: 42px;
    font-size: 1rem;
    right: 20px;
  }
  
  .dark-mode-toggle {
    bottom: 78px;
  }
  
  .footer-links {
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  .logo svg {
    width: 30px;
    height: 30px;
  }
  
  .search-box {
    display: none;
  }
  
  .hero {
    padding: 32px 0;
  }
  
  .hero-text h1 {
    font-size: 1.5rem;
  }
  
  .hero-text p {
    font-size: 0.95rem;
  }
  
  .btn {
    padding: 11px 24px;
    font-size: 0.9rem;
  }
  
  .carousel-item {
    min-width: 220px;
    padding: 18px;
  }
  
  .card {
    padding: 20px;
  }
  
  .stats-section {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }
  
  details summary {
    font-size: 0.9rem;
  }
  
  details p {
    font-size: 0.88rem;
  }
  
  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .sticky-nav,
  .scroll-top,
  .dark-mode-toggle,
  .menu-toggle,
  .search-box,
  .btn {
    display: none !important;
  }
  
  body {
    background: #fff;
    color: #000;
  }
  
  .card,
  .banner-carousel,
  .faq-grid,
  .howto-grid {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
  }
}

/* ---------- 无障碍与焦点样式 ---------- */
a:focus,
button:focus,
input:focus,
details summary:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 工具类 ---------- */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 0.5rem;
}

.mt-4 {
  margin-top: 1rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

/* 渐变文字效果 */
.gradient-text {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 毛玻璃卡片 */
.glass-card {
  background: var(--card);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-md);
}

/* 悬停上浮动画 */
.hover-lift {
  transition: var(--transition);
}

.hover-lift:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}