:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --text: #1a2b3c;
  --text-secondary: #4a5b6e;
  --accent: #c94b4b;
  --accent-hover: #a83a3a;
  --accent-soft: #f2e8e8;
  --border: #e2e6ed;
  --border-glass: rgba(255, 255, 255, 0.28);
  --shadow: 0 2px 8px rgba(26, 43, 60, 0.06);
  --shadow-hover: 0 12px 32px rgba(26, 43, 60, 0.10);
  --shadow-lg: 0 16px 48px rgba(26, 43, 60, 0.14);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --gradient-banner: linear-gradient(135deg, #1a2b3c 0%, #2d4a5e 42%, #6b3a4a 72%, #c94b4b 100%);
  --gradient-accent: linear-gradient(135deg, #c94b4b 0%, #e07a5f 100%);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s 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%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: var(--accent);
  color: #fff;
}

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

/* ============ 导航吸顶 · 毛玻璃 ============ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface-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-smooth), background-color var(--transition-smooth);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(26, 43, 60, 0.10);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  white-space: nowrap;
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.85;
  color: var(--text);
}

.logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  transition: transform var(--transition-bounce);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.08);
}

.logo span {
  color: var(--accent);
}

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

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

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

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

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

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

/* 搜索框 · 毛玻璃 */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-smooth);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(201, 75, 75, 0.12);
}

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

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

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

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

/* 暗黑模式切换 · 毛玻璃圆钮 */
.dark-toggle {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-smooth);
  flex-shrink: 0;
}

.dark-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(20deg) scale(1.08);
  box-shadow: 0 0 0 4px rgba(201, 75, 75, 0.10);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

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

/* ============ 暗黑模式 ============ */
body.dark {
  --bg: #121a24;
  --surface: #1a2634;
  --surface-glass: rgba(18, 26, 36, 0.78);
  --text: #e8edf3;
  --text-secondary: #9aacbf;
  --border: #2a3a4a;
  --border-glass: rgba(255, 255, 255, 0.08);
  --accent-soft: #2a1a1a;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
}

body.dark .navbar {
  background: var(--surface-glass);
}

body.dark .search-box {
  background: #121a24;
}

body.dark .dark-toggle {
  background: #121a24;
}

body.dark .search-box:focus-within {
  box-shadow: 0 0 0 3px rgba(201, 75, 75, 0.25);
}

/* ============ Banner 轮播 · 渐变 + 毛玻璃 ============ */
.banner {
  position: relative;
  overflow: hidden;
  background: var(--gradient-banner);
  background-size: 200% 200%;
  animation: gradientShift 12s ease infinite;
  border-radius: var(--radius-lg);
  margin: 24px 0;
  min-height: 320px;
  display: flex;
  align-items: center;
  box-shadow: var(--shadow-lg);
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.08) 0%, transparent 55%),
              radial-gradient(circle at 85% 75%, rgba(201, 75, 75, 0.18) 0%, transparent 50%);
  pointer-events: none;
  z-index: 1;
}

.banner-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  padding: 40px 48px;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
  pointer-events: none;
  transform: translateX(16px);
}

.banner-slide.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

.banner-content {
  max-width: 600px;
  color: #fff;
  position: relative;
  z-index: 2;
}

.banner-content h2 {
  font-size: 2rem;
  line-height: 1.3;
  margin-bottom: 12px;
  font-weight: 700;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  letter-spacing: -0.01em;
}

.banner-content p {
  font-size: 1.05rem;
  opacity: 0.92;
  margin-bottom: 20px;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-accent);
  color: #fff;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
  font-family: var(--font);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(201, 75, 75, 0.3);
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 75, 75, 0.45);
  color: #fff;
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: translateY(0);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  margin-left: 12px;
  box-shadow: none;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: #fff;
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.banner-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 3;
}

.banner-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-smooth);
  position: relative;
}

.banner-dots span::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
}

.banner-dots span:hover {
  background: rgba(255, 255, 255, 0.7);
}

.banner-dots span.active {
  background: #fff;
  width: 28px;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 16px 0 8px;
  flex-wrap: wrap;
}

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

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

.breadcrumb svg {
  width: 14px;
  height: 14px;
  opacity: 0.5;
  flex-shrink: 0;
}

/* ============ 通用区块 ============ */
section {
  padding: 48px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
  letter-spacing: -0.01em;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  font-size: 1rem;
}

.section-header .line {
  width: 48px;
  height: 3px;
  background: var(--gradient-accent);
  margin: 16px auto 0;
  border-radius: 2px;
  transition: width var(--transition-smooth);
}

.section-header:hover .line {
  width: 72px;
}

/* ============ 卡片网格 · 圆角 + 毛玻璃 + hover ============ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border);
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

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

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

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

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent);
  transition: all var(--transition-bounce);
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(-4deg);
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(201, 75, 75, 0.3);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  font-weight: 600;
  color: var(--text);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* ============ 数字统计 ============ */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius);
  transition: all var(--transition-smooth);
}

.stat-item:hover {
  background: var(--surface);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.stat-num {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  transition: transform var(--transition-bounce);
}

.stat-item:hover .stat-num {
  transform: scale(1.06);
}

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

/* ============ 文章列表 ============ */
.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

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

.article-thumb {
  height: 160px;
  overflow: hidden;
  background: var(--accent-soft);
  position: relative;
}

.article-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(26, 43, 60, 0.08) 100%);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.article-card:hover .article-thumb::after {
  opacity: 1;
}

.article-thumb svg {
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.article-card:hover .article-thumb svg {
  transform: scale(1.06);
}

.article-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-meta span:last-child {
  color: var(--accent);
  font-weight: 500;
}

.article-body h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  transition: color var(--transition-fast);
}

.article-card:hover .article-body h3 {
  color: var(--accent);
}

.article-body p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 12px;
  flex: 1;
}

.read-more {
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast), color var(--transition-fast);
  align-self: flex-start;
}

.read-more:hover {
  gap: 8px;
}

/* ============ FAQ 手风琴 ============ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

.faq-item:hover {
  box-shadow: var(--shadow);
}

.faq-item.open {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(201, 75, 75, 0.10);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.98rem;
  gap: 12px;
  user-select: none;
  color: var(--text);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.faq-q:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.faq-q svg {
  flex-shrink: 0;
  transition: transform var(--transition-smooth);
  color: var(--accent);
}

.faq-item.open .faq-q svg {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.faq-item.open .faq-a {
  max-height: 500px;
  padding: 0 24px 20px;
}

/* ============ HowTo 步骤 ============ */
.howto-steps {
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  transition: transform var(--transition-smooth);
}

.step:hover {
  transform: translateX(6px);
}

.step:last-child {
  border-bottom: none;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  font-size: 1rem;
  transition: all var(--transition-bounce);
  box-shadow: 0 4px 12px rgba(201, 75, 75, 0.25);
}

.step:hover .step-num {
  transform: scale(1.12) rotate(-6deg);
  box-shadow: 0 6px 20px rgba(201, 75, 75, 0.4);
}

.step-content h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text);
}

.step-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ============ 案例/评价 · 毛玻璃 ============ */
.testimonial {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border);
  position: relative;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.testimonial::before {
  content: '"';
  font-size: 4rem;
  color: var(--accent);
  opacity: 0.15;
  position: absolute;
  top: 8px;
  left: 20px;
  font-family: Georgia, serif;
  line-height: 1;
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

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

.testimonial:hover::before {
  opacity: 0.28;
  transform: scale(1.1);
}

.testimonial p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: all var(--transition-bounce);
}

.testimonial:hover .avatar {
  background: var(--gradient-accent);
  color: #fff;
  transform: scale(1.08);
}

.testimonial-author strong {
  font-size: 0.9rem;
  display: block;
  color: var(--text);
}

.testimonial-author span {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ============ 联系信息 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-item {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow);
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.contact-item svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
  transition: transform var(--transition-bounce);
}

.contact-item:hover svg {
  transform: scale(1.15) rotate(-6deg);
}

.contact-item h3 {
  font-size: 1rem;
  margin-bottom: 4px;
  font-weight: 600;
  color: var(--text);
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ============ 页脚 ============ */
footer {
  background: #1a2b3c;
  color: #c5d0dc;
  padding: 48px 0 24px;
  margin-top: 48px;
  position: relative;
  overflow: hidden;
}

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

body.dark footer {
  background: #0d141c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: #9aacbf;
  font-size: 0.88rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.footer-col a:hover {
  color: #fff;
  padding-left: 4px;
}

.footer-about p {
  font-size: 0.88rem;
  color: #9aacbf;
  margin-bottom: 16px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: #7a8fa3;
}

.footer-bottom a {
  color: #7a8fa3;
  transition: color var(--transition-fast);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ============ 返回顶部 ============ */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: none;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
  box-shadow: 0 4px 16px rgba(201, 75, 75, 0.4);
}

.back-top.show {
  opacity: 1;
  visibility: visible;
}

.back-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 8px 28px rgba(201, 75, 75, 0.55);
}

.back-top:active {
  transform: translateY(-2px) scale(1);
}

/* ============ 滚动动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 内链锚点导航 ============ */
.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 32px;
}

.anchor-nav a {
  padding: 6px 16px;
  border-radius: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-smooth);
}

.anchor-nav a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(201, 75, 75, 0.15);
}

/* ============ 团队/资质 ============ */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  padding: 28px 20px;
}

.team-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--accent-soft);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.3rem;
  transition: all var(--transition-bounce);
}

.team-card:hover .team-avatar {
  background: var(--gradient-accent);
  color: #fff;
  transform: scale(1.08) rotate(-6deg);
  box-shadow: 0 8px 24px rgba(201, 75, 75, 0.35);
}

.team-card h3 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--text);
}

.team-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ============ 标签 ============ */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  padding: 4px 12px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 500;
  transition: all var(--transition-smooth);
  cursor: default;
}

.tag:hover {
  background: var(--gradient-accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(201, 75, 75, 0.25);
}

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

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--surface);
    padding: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    gap: 16px;
    z-index: 999;
    animation: slideDown 0.3s ease;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .nav-links.open a::after {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .search-box input {
    width: 100px;
  }
  .banner {
    min-height: 280px;
  }
  .banner-content h2 {
    font-size: 1.4rem;
  }
  .banner-slide {
    padding: 28px 24px;
  }
  .grid-3,
  .grid-2,
  .article-list {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .section-header h2 {
    font-size: 1.4rem;
  }
  .back-top {
    bottom: 20px;
    right: 20px;
  }
  .step {
    gap: 14px;
  }
  .step-num {
    width: 34px;
    height: 34px;
    font-size: 0.9rem;
  }
  section {
    padding: 36px 0;
  }
}

@media (max-width: 600px) {
  .team-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .stats {
    grid-template-columns: 1fr 1fr;
  }
  .stat-num {
    font-size: 1.8rem;
  }
  .btn {
    padding: 10px 20px;
    font-size: 0.88rem;
  }
  .btn-outline {
    margin-left: 8px;
  }
  .banner-content h2 {
    font-size: 1.2rem;
  }
  .banner-content p {
    font-size: 0.92rem;
  }
  .search-box input {
    width: 80px;
  }
  .card {
    padding: 22px;
  }
  .article-body {
    padding: 16px 18px 20px;
  }
  .faq-q {
    padding: 16px 18px;
    font-size: 0.92rem;
  }
  .faq-a {
    padding: 0 18px;
  }
  .faq-item.open .faq-a {
    padding: 0 18px 16px;
  }
  .container {
    padding: 0 16px;
  }
}

/* ============ 无障碍与动效偏好 ============ */
@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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============ 打印样式 ============ */
@media print {
  .navbar,
  .back-top,
  .banner-dots,
  .menu-toggle,
  .dark-toggle,
  .search-box,
  .anchor-nav {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .card,
  .article-card,
  .faq-item,
  .testimonial,
  .contact-item {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}