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

:root {
  --primary: #ff6b6b;
  --primary-dark: #e05555;
  --primary-light: #ff8e8e;
  --secondary: #4ecdc4;
  --secondary-dark: #38b2a8;
  --accent: #ffd93d;
  --dark: #2d3436;
  --gray: #636e72;
  --light-gray: #f8f9fa;
  --white: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.1);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 36px rgba(0, 0, 0, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-primary: linear-gradient(135deg, #ff6b6b 0%, #ff8e8e 50%, #ffa07a 100%);
  --gradient-secondary: linear-gradient(135deg, #4ecdc4 0%, #44a08d 100%);
  --gradient-mixed: linear-gradient(135deg, #ff6b6b 0%, #4ecdc4 100%);
  --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-cool: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

::selection {
  background: var(--primary);
  color: var(--white);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: 4px;
}

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

/* ========== 导航栏 ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  background: rgba(255, 255, 255, 0.88);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--dark);
  flex-shrink: 0;
  transition: var(--transition);
}

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

.nav-logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 6px rgba(255, 107, 107, 0.3));
  transition: var(--transition);
}

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

.nav-logo span {
  background: var(--gradient-mixed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

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

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2.5px;
  background: var(--gradient-mixed);
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 2px;
}

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

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

.search-box {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 24px;
  padding: 6px 14px;
  gap: 6px;
  transition: var(--transition);
}

.search-box:focus-within {
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.15);
  border-color: var(--primary-light);
  background: var(--white);
}

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

.search-box input::placeholder {
  color: #b2bec3;
}

.search-box svg {
  width: 18px;
  height: 18px;
  fill: var(--gray);
  flex-shrink: 0;
  cursor: pointer;
  transition: var(--transition);
}

.search-box svg:hover {
  fill: var(--primary);
  transform: scale(1.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 22px;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: inherit;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(255, 107, 107, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 107, 0.45);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.82rem;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: var(--transition);
}

.menu-toggle:hover {
  background: rgba(255, 107, 107, 0.08);
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 主内容 ========== */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

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

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

.breadcrumb span {
  margin: 0 6px;
  color: #b2bec3;
}

/* ========== Banner轮播 ========== */
.banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 40px;
  background: var(--gradient-mixed);
  min-height: 340px;
  box-shadow: 0 16px 48px rgba(255, 107, 107, 0.2);
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: bannerFloat 8s ease-in-out infinite;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(78, 205, 196, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: bannerFloat 10s ease-in-out infinite reverse;
}

@keyframes bannerFloat {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-20px, 20px) scale(1.08);
  }
}

.banner-slide {
  display: none;
  padding: 64px 48px;
  min-height: 340px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.banner-slide.active {
  display: flex;
  animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.banner-content {
  max-width: 600px;
}

.banner-content h2 {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 14px;
  line-height: 1.3;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
  letter-spacing: -0.02em;
}

.banner-content p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 28px;
  line-height: 1.8;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
}

.banner-content .btn {
  background: var(--white);
  color: var(--primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
  font-weight: 700;
}

.banner-content .btn:hover {
  background: var(--light-gray);
  color: var(--primary-dark);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.banner-dots {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.banner-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  padding: 0;
}

.banner-dot:hover {
  background: rgba(255, 255, 255, 0.75);
  transform: scale(1.2);
}

.banner-dot.active {
  background: var(--white);
  transform: scale(1.35);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

/* ========== 数字统计 ========== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.stat-item {
  text-align: center;
  padding: 30px 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-mixed);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.stat-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(255, 107, 107, 0.2);
}

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

.stat-number {
  font-size: 2.1rem;
  font-weight: 800;
  background: var(--gradient-mixed);
  -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(--gray);
  margin-top: 8px;
  font-weight: 500;
}

/* ========== 章节通用 ========== */
.section {
  margin-bottom: 64px;
}

.section-header {
  margin-bottom: 32px;
}

.section-header h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
  position: relative;
  padding-left: 18px;
  letter-spacing: -0.01em;
}

.section-header h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--gradient-mixed);
  border-radius: 4px;
  transition: var(--transition);
}

.section-header:hover h2::before {
  width: 6px;
  box-shadow: 0 0 12px rgba(255, 107, 107, 0.4);
}

.section-header p {
  color: var(--gray);
  font-size: 0.95rem;
  padding-left: 18px;
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: rgba(255, 107, 107, 0.15);
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.card h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
}

.card p {
  color: var(--gray);
  font-size: 0.95rem;
  margin-bottom: 10px;
  line-height: 1.8;
}

.card p:last-child {
  margin-bottom: 0;
}

/* ========== 品牌介绍 ========== */
.brand-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.brand-intro-text h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--dark);
  letter-spacing: -0.01em;
}

.brand-intro-text p {
  color: var(--gray);
  font-size: 0.95rem;
  margin-bottom: 14px;
  line-height: 1.9;
}

.brand-intro-text h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  margin-top: 20px;
  color: var(--dark);
}

.brand-intro-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.brand-intro-visual:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-hover);
}

.brand-intro-visual svg {
  width: 100%;
  max-width: 340px;
  height: auto;
}

/* ========== 产品优势网格 ========== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-mixed);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
  background: var(--white);
  border-color: rgba(255, 107, 107, 0.18);
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient-mixed);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  transition: var(--transition);
  box-shadow: 0 6px 18px rgba(255, 107, 107, 0.25);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 8px 24px rgba(255, 107, 107, 0.35);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--white);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--dark);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.8;
}

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

.article-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 26px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-mixed);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.article-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: rgba(255, 107, 107, 0.15);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: #b2bec3;
  margin-bottom: 12px;
}

.article-tag {
  display: inline-block;
  padding: 3px 12px;
  background: rgba(255, 107, 107, 0.1);
  color: var(--primary);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  transition: var(--transition);
}

.article-card:hover .article-tag {
  background: var(--gradient-primary);
  color: var(--white);
}

.article-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--dark);
  line-height: 1.5;
}

.article-card h3 a {
  color: var(--dark);
  transition: var(--transition);
}

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

.article-card p {
  font-size: 0.88rem;
  color: var(--gray);
  line-height: 1.8;
  margin-bottom: 14px;
}

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

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

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

.faq-item {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.faq-item:hover {
  border-color: rgba(255, 107, 107, 0.2);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.faq-item.open {
  border-color: rgba(255, 107, 107, 0.25);
  box-shadow: 0 8px 28px rgba(255, 107, 107, 0.1);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 26px;
  cursor: pointer;
  background: transparent;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--dark);
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  transition: var(--transition);
  gap: 16px;
}

.faq-question:hover {
  background: rgba(255, 107, 107, 0.04);
}

.faq-question .faq-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  fill: var(--primary);
}

.faq-item.open .faq-question .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease;
  padding: 0 26px;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 26px 22px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.9;
}

/* ========== HowTo ========== */
.howto-steps {
  counter-reset: step-counter;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.howto-step {
  display: flex;
  gap: 20px;
  padding: 26px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  transition: var(--transition);
  counter-increment: step-counter;
  position: relative;
  overflow: hidden;
}

.howto-step::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-mixed);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.howto-step:hover {
  background: var(--white);
  box-shadow: var(--shadow-hover);
  transform: translateX(6px);
  border-color: rgba(255, 107, 107, 0.15);
}

.howto-step:hover::before {
  transform: scaleY(1);
}

.howto-step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-mixed);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(255, 107, 107, 0.3);
  transition: var(--transition);
}

.howto-step:hover .howto-step-number {
  transform: scale(1.12) rotate(-8deg);
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.howto-step-content h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--dark);
}

.howto-step-content p {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.8;
}

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

.contact-item {
  text-align: center;
  padding: 36px 22px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.contact-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-mixed);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.contact-item:hover {
  background: var(--white);
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
  border-color: rgba(255, 107, 107, 0.15);
}

.contact-item:hover::before {
  transform: scaleX(1);
}

.contact-item svg {
  width: 38px;
  height: 38px;
  fill: var(--primary);
  margin-bottom: 16px;
  transition: var(--transition);
}

.contact-item:hover svg {
  transform: scale(1.15) translateY(-4px);
  fill: var(--primary-dark);
}

.contact-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--dark);
}

.contact-item p {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.8;
}

/* ========== 页脚 ========== */
.footer {
  background: linear-gradient(180deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: rgba(255, 255, 255, 0.7);
  padding: 56px 0 28px;
  margin-top: 72px;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.footer::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(78, 205, 196, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

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

.footer-brand h3 {
  color: var(--white);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand h3 svg {
  filter: drop-shadow(0 2px 8px rgba(255, 107, 107, 0.4));
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.9;
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--gradient-mixed);
  border-radius: 2px;
}

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

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

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.85rem;
  transition: var(--transition);
  display: inline-block;
}

.footer-col ul li a:hover {
  color: var(--primary-light);
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.55);
  transition: var(--transition);
}

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

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient-mixed);
  color: var(--white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  transform: translateY(-5px) scale(1.08);
  box-shadow: 0 10px 30px rgba(255, 107, 107, 0.5);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
  fill: var(--white);
}

/* ========== 暗黑模式 ========== */
body.dark-mode {
  --dark: #e8e8e8;
  --gray: #a0a0a0;
  --light-gray: #1e1e1e;
  --white: #121212;
  --glass-bg: rgba(30, 30, 30, 0.72);
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  background: #121212;
  color: #e8e8e8;
}

body.dark-mode .navbar {
  background: rgba(18, 18, 18, 0.88);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .navbar.scrolled {
  background: rgba(18, 18, 18, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

body.dark-mode .nav-logo {
  color: #e8e8e8;
}

body.dark-mode .menu-toggle span {
  background: #e8e8e8;
}

body.dark-mode .menu-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
}

body.dark-mode .search-box {
  background: rgba(30, 30, 30, 0.8);
  border-color: rgba(255, 255, 255, 0.08);
}

body.dark-mode .search-box:focus-within {
  background: #1e1e1e;
  border-color: var(--primary-light);
}

body.dark-mode .search-box input {
  color: #e8e8e8;
}

body.dark-mode .card {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .card:hover {
  background: #1e1e1e;
}

body.dark-mode .feature-card {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .feature-card:hover {
  background: #1e1e1e;
  border-color: rgba(255, 107, 107, 0.25);
}

body.dark-mode .article-card {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .article-card:hover {
  background: #1e1e1e;
}

body.dark-mode .article-card h3 a {
  color: #e8e8e8;
}

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

body.dark-mode .faq-question {
  background: transparent;
  color: #e8e8e8;
}

body.dark-mode .faq-question:hover {
  background: rgba(255, 255, 255, 0.04);
}

body.dark-mode .faq-item {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .faq-item.open {
  border-color: rgba(255, 107, 107, 0.3);
}

body.dark-mode .howto-step {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .howto-step:hover {
  background: #1e1e1e;
}

body.dark-mode .contact-item {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .contact-item:hover {
  background: #1e1e1e;
}

body.dark-mode .stat-item {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .stat-item:hover {
  background: #1e1e1e;
}

body.dark-mode .brand-intro-visual {
  background: rgba(30, 30, 30, 0.72);
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .brand-intro-visual svg {
  filter: brightness(0.88);
}

body.dark-mode .footer {
  background: linear-gradient(180deg, #0a0a14 0%, #0d1220 50%, #0a1a2e 100%);
}

body.dark-mode .banner {
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

body.dark-mode .section-header h2 {
  color: #e8e8e8;
}

body.dark-mode .section-header p {
  color: #a0a0a0;
}

body.dark-mode .breadcrumb {
  color: #a0a0a0;
}

body.dark-mode .breadcrumb a {
  color: #a0a0a0;
}

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

body.dark-mode .nav-links {
  background: #1e1e1e;
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .nav-links a {
  color: #a0a0a0;
}

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

body.dark-mode .card h3,
body.dark-mode .card h4 {
  color: #e8e8e8;
}

body.dark-mode .brand-intro-text h3,
body.dark-mode .brand-intro-text h4 {
  color: #e8e8e8;
}

body.dark-mode .feature-card h3 {
  color: #e8e8e8;
}

body.dark-mode .howto-step-content h3 {
  color: #e8e8e8;
}

body.dark-mode .contact-item h3 {
  color: #e8e8e8;
}

/* ========== 滚动动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.fade-in:nth-child(2) {
  transition-delay: 0.08s;
}

.fade-in:nth-child(3) {
  transition-delay: 0.16s;
}

.fade-in:nth-child(4) {
  transition-delay: 0.24s;
}

/* ========== 响应式 ========== */
@media (max-width: 992px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .brand-intro {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .brand-intro-visual {
    order: -1;
    max-width: 480px;
    margin: 0 auto;
  }

  .banner-content h2 {
    font-size: 1.8rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
    animation: menuSlide 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  body.dark-mode .nav-links {
    background: rgba(18, 18, 18, 0.96);
    border-bottom-color: rgba(255, 255, 255, 0.06);
  }

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

  .nav-links a {
    font-size: 1rem;
    padding: 8px 0;
  }

  .menu-toggle {
    display: flex;
  }

  .search-box {
    display: none;
  }

  .grid-3,
  .grid-2,
  .article-list {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .banner-content h2 {
    font-size: 1.5rem;
  }

  .banner-content p {
    font-size: 0.95rem;
  }

  .banner-slide {
    padding: 44px 28px;
    min-height: 300px;
  }

  .banner {
    min-height: 300px;
    border-radius: var(--radius);
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat-number {
    font-size: 1.6rem;
  }

  .stat-item {
    padding: 22px 12px;
  }

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

  .section {
    margin-bottom: 48px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 10px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  .howto-step {
    padding: 22px;
    gap: 16px;
  }

  .howto-step-number {
    width: 38px;
    height: 38px;
    font-size: 0.9rem;
  }

  .card {
    padding: 24px;
  }

  .feature-card {
    padding: 26px 22px;
  }

  .article-card {
    padding: 22px;
  }

  .contact-item {
    padding: 30px 20px;
  }

  .faq-question {
    padding: 18px 22px;
    font-size: 0.9rem;
  }

  .faq-answer {
    padding: 0 22px;
  }

  .faq-item.open .faq-answer {
    padding: 0 22px 18px;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 16px;
    height: 60px;
  }

  .main {
    padding: 0 16px;
  }

  .nav-logo {
    font-size: 1.15rem;
  }

  .nav-logo svg {
    width: 30px;
    height: 30px;
  }

  .nav-links {
    top: 60px;
    padding: 16px 16px;
  }

  .stats {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stat-item {
    padding: 18px 8px;
  }

  .stat-number {
    font-size: 1.3rem;
  }

  .stat-label {
    font-size: 0.78rem;
  }

  .banner-content h2 {
    font-size: 1.3rem;
  }

  .banner-content p {
    font-size: 0.88rem;
  }

  .banner-slide {
    padding: 36px 20px;
    min-height: 280px;
  }

  .banner {
    min-height: 280px;
    border-radius: var(--radius-sm);
  }

  .card {
    padding: 20px;
    border-radius: var(--radius-sm);
  }

  .feature-card {
    padding: 22px 18px;
    border-radius: var(--radius-sm);
  }

  .feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
  }

  .feature-icon svg {
    width: 20px;
    height: 20px;
  }

  .article-card {
    padding: 18px;
    border-radius: var(--radius-sm);
  }

  .howto-step {
    padding: 18px;
    gap: 14px;
    border-radius: var(--radius-sm);
  }

  .howto-step-number {
    width: 34px;
    height: 34px;
    font-size: 0.85rem;
  }

  .contact-item {
    padding: 26px 18px;
    border-radius: var(--radius-sm);
  }

  .contact-item svg {
    width: 32px;
    height: 32px;
  }

  .faq-question {
    padding: 16px 18px;
    font-size: 0.88rem;
  }

  .faq-answer {
    padding: 0 18px;
  }

  .faq-item.open .faq-answer {
    padding: 0 18px 16px;
  }

  .faq-answer p {
    font-size: 0.85rem;
  }

  .footer {
    padding: 36px 0 22px;
    margin-top: 48px;
  }

  .footer-container {
    padding: 0 16px;
  }

  .footer-brand h3 {
    font-size: 1.05rem;
  }

  .footer-col h4 {
    font-size: 0.9rem;
  }

  .section-header h2 {
    font-size: 1.25rem;
  }

  .section-header p {
    font-size: 0.88rem;
  }

  .section {
    margin-bottom: 40px;
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 38px;
    height: 38px;
  }

  .back-to-top svg {
    width: 18px;
    height: 18px;
  }

  .btn {
    padding: 7px 18px;
    font-size: 0.85rem;
  }

  .btn-sm {
    padding: 5px 14px;
    font-size: 0.78rem;
  }
}

/* ========== 打印样式 ========== */
@media print {
  .navbar,
  .back-to-top,
  .banner-dots,
  .footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .card,
  .feature-card,
  .article-card,
  .faq-item,
  .howto-step,
  .contact-item,
  .stat-item {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ========== 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;
  }

  html {
    scroll-behavior: auto;
  }
}