:root {
  --brand-primary: #e94560;
  --brand-secondary: #533483;
  --brand-accent: #f59e0b;
  --brand-dark: #1a1a2e;
  --brand-light: #f5f5f7;
  --brand-gray: #6b7280;
  --brand-border: #e5e7eb;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --bg-body: #ffffff;
  --bg-card: #ffffff;
  --bg-section-alt: #fafafa;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.35);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 40px -12px rgba(83, 52, 131, 0.22);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-brand: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #533483 55%, #e94560 130%);
}

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

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-body);
  padding-top: 72px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.dark-mode {
  --text-primary: #f3f4f6;
  --text-secondary: #cbd5e1;
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --bg-section-alt: #111827;
  --brand-border: #334155;
  --brand-gray: #9ca3af;
  --bg-glass: rgba(30, 41, 59, 0.72);
  --glass-border: rgba(148, 163, 184, 0.18);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 40px -12px rgba(0, 0, 0, 0.6);
}

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

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

a:hover {
  color: var(--brand-secondary);
}

ul,
ol {
  list-style: none;
}

::selection {
  background: rgba(233, 69, 96, 0.22);
  color: var(--text-primary);
}

:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===================== 头部导航 ===================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 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(--glass-border);
  transition: box-shadow var(--transition), background var(--transition), border-color var(--transition);
  height: 72px;
}

body.dark-mode .site-header {
  background: rgba(15, 23, 42, 0.82);
  border-bottom-color: rgba(148, 163, 184, 0.12);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

.logo svg {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.05);
  box-shadow: 0 6px 18px rgba(233, 69, 96, 0.35);
}

.logo-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.01em;
}

.nav-main {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}

.nav-main a {
  position: relative;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

.nav-main a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-main a:hover,
.nav-main a.active {
  background: rgba(233, 69, 96, 0.08);
  color: var(--brand-primary);
}

.nav-main a:hover::after,
.nav-main a.active::after {
  width: 40%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--brand-border);
  background: var(--bg-card);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 1.1rem;
  padding: 0;
}

.btn-icon:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.25);
  transform: translateY(-2px);
}

.btn-icon:active {
  transform: translateY(0) scale(0.95);
}

.mobile-menu-btn {
  display: none;
}

/* ===================== 移动导航 ===================== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--brand-border);
  padding: 12px 20px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-lg);
  animation: slideDown 0.3s ease;
}

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

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

.mobile-nav a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition), padding-left var(--transition);
}

.mobile-nav a:hover {
  background: rgba(233, 69, 96, 0.08);
  color: var(--brand-primary);
  padding-left: 22px;
}

/* ===================== 搜索栏 ===================== */
.search-bar-wrapper {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--brand-border);
  padding: 12px 20px;
  z-index: 998;
  box-shadow: var(--shadow-lg);
}

.search-bar-wrapper.open {
  display: block;
  animation: slideDown 0.3s ease;
}

.search-form {
  display: flex;
  gap: 8px;
  max-width: 600px;
  margin: 0 auto;
}

.search-form input {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--bg-body);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.search-form input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.12);
}

.search-form button {
  padding: 10px 24px;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  font-family: inherit;
}

.search-form button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(233, 69, 96, 0.35);
  filter: brightness(1.05);
}

/* ===================== 面包屑 ===================== */
.breadcrumb {
  padding: 16px 0 8px;
  font-size: 0.85rem;
  color: var(--brand-gray);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 4px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--brand-border);
  margin-right: 4px;
}

.breadcrumb a {
  color: var(--brand-gray);
}

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

/* ===================== Banner 轮播 ===================== */
.hero-slider {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  margin: 16px 0 32px;
  background: var(--gradient-hero);
  min-height: 260px;
  box-shadow: var(--shadow-xl);
}

.hero-slider::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.35), transparent 70%);
  pointer-events: none;
  animation: floatOrb 8s ease-in-out infinite;
}

.hero-slider::after {
  content: "";
  position: absolute;
  bottom: -50%;
  left: -8%;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(83, 52, 131, 0.4), transparent 70%);
  pointer-events: none;
  animation: floatOrb 10s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-16px, 16px) scale(1.08); }
}

.slide {
  display: none;
  padding: 48px 40px;
  color: #fff;
  position: relative;
  z-index: 1;
}

.slide.active {
  display: block;
  animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

.slide p {
  font-size: 1rem;
  opacity: 0.92;
  max-width: 600px;
  line-height: 1.75;
}

.slider-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.slider-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), width var(--transition);
  padding: 0;
}

.slider-dots button.active {
  background: #fff;
  width: 26px;
  border-radius: 6px;
  transform: scale(1.05);
}

/* ===================== 区块通用 ===================== */
.section {
  padding: 56px 0;
}

.section-alt {
  background: var(--bg-section-alt);
}

.section-header {
  margin-bottom: 36px;
}

.section-header h1,
.section-header h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.section-header h1 {
  font-size: 2rem;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.section-header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 760px;
  line-height: 1.75;
}

/* ===================== 卡片网格 ===================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
}

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

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(233, 69, 96, 0.4);
}

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

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
}

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

.card .card-meta {
  font-size: 0.78rem;
  color: var(--brand-gray);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

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

.card .read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
  transition: gap var(--transition), color var(--transition);
}

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

/* ===================== 统计数字 ===================== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
  text-align: center;
}

.stat-item {
  padding: 24px 12px;
  background: var(--bg-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.35);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

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

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

.faq-item:hover {
  border-color: rgba(233, 69, 96, 0.35);
}

.faq-item.open {
  border-color: rgba(233, 69, 96, 0.5);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: 18px 20px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: background var(--transition), color var(--transition);
  font-family: inherit;
  line-height: 1.5;
}

.faq-question:hover {
  background: rgba(233, 69, 96, 0.05);
  color: var(--brand-primary);
}

.faq-question .faq-icon {
  flex-shrink: 0;
  transition: transform var(--transition), color var(--transition);
  font-size: 0.8rem;
  color: var(--brand-primary);
}

.faq-item.open .faq-question .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 20px;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 20px 20px;
}

.faq-answer p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===================== HowTo 步骤 ===================== */
.howto-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step;
}

.howto-step {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--brand-border);
  position: relative;
  transition: padding-left var(--transition);
}

.howto-step:hover {
  padding-left: 6px;
}

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

.howto-step-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 6px 16px rgba(233, 69, 96, 0.28);
  transition: transform var(--transition);
}

.howto-step:hover .howto-step-number {
  transform: scale(1.08) rotate(-4deg);
}

.howto-step-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.howto-step-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===================== 团队/作者 ===================== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(233, 69, 96, 0.4);
}

.team-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-brand);
  box-shadow: 0 8px 20px rgba(83, 52, 131, 0.3);
  transition: transform var(--transition);
}

.team-card:hover .team-avatar {
  transform: scale(1.08) rotate(6deg);
}

.team-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.team-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===================== 联系信息 ===================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.contact-item {
  background: var(--bg-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.35);
}

.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(233, 69, 96, 0.1);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}

.contact-item:hover .contact-icon {
  background: rgba(233, 69, 96, 0.18);
  transform: scale(1.06);
}

.contact-item h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.contact-item p,
.contact-item a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  word-break: break-all;
}

.contact-item a:hover {
  color: var(--brand-primary);
}

/* ===================== 页脚 ===================== */
.site-footer {
  position: relative;
  background: var(--brand-dark);
  color: #cbd5e1;
  padding: 48px 0 24px;
  margin-top: 0;
  overflow: hidden;
}

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

body.dark-mode .site-footer {
  background: #0b1121;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 36px;
}

.footer-col h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 14px;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col a {
  font-size: 0.85rem;
  color: #94a3b8;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-col a:hover {
  color: var(--brand-primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: #64748b;
}

.footer-bottom a {
  color: #94a3b8;
}

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

/* ===================== 返回顶部 ===================== */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(233, 69, 96, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
  z-index: 900;
  font-size: 1.2rem;
  padding: 0;
}

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

.back-to-top:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 16px 32px rgba(233, 69, 96, 0.5);
}

.back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

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

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

/* ===================== 图标尺寸 ===================== */
.icon-sm {
  width: 18px;
  height: 18px;
}

.icon-md {
  width: 22px;
  height: 22px;
}

/* ===================== 响应式 ===================== */
@media (max-width: 900px) {
  .nav-main {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .slide {
    padding: 36px 24px;
  }

  .slide h2 {
    font-size: 1.4rem;
  }

  .section {
    padding: 40px 0;
  }

  .section-header h1 {
    font-size: 1.55rem;
  }

  .section-header h2 {
    font-size: 1.4rem;
  }

  .hero-slider {
    min-height: 220px;
    border-radius: var(--radius-lg);
  }

  .footer-grid {
    gap: 24px;
  }
}

@media (max-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }

  .team-grid,
  .contact-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

@media (max-width: 480px) {
  body {
    padding-top: 64px;
    font-size: 15px;
  }

  .site-header {
    height: 64px;
  }

  .header-inner {
    height: 64px;
    gap: 10px;
  }

  .mobile-nav {
    top: 64px;
  }

  .search-bar-wrapper {
    top: 64px;
  }

  .logo svg {
    width: 32px;
    height: 32px;
  }

  .logo-text {
    font-size: 1rem;
  }

  .slide {
    padding: 28px 20px;
  }

  .slide h2 {
    font-size: 1.2rem;
  }

  .slide p {
    font-size: 0.88rem;
  }

  .section {
    padding: 32px 0;
  }

  .section-header {
    margin-bottom: 24px;
  }

  .section-header h1 {
    font-size: 1.3rem;
  }

  .section-header h2 {
    font-size: 1.2rem;
  }

  .card-grid,
  .team-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .search-form {
    flex-direction: column;
  }

  .search-form button {
    width: 100%;
  }

  .howto-step {
    gap: 14px;
  }

  .howto-step-number {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  .back-to-top {
    bottom: 18px;
    right: 18px;
    width: 42px;
    height: 42px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@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;
  }
}

@media print {
  .site-header,
  .mobile-nav,
  .search-bar-wrapper,
  .back-to-top,
  .slider-dots {
    display: none !important;
  }

  body {
    padding-top: 0;
    color: #000;
    background: #fff;
  }

  .card,
  .faq-item {
    break-inside: avoid;
    box-shadow: none;
  }
}