/* ===== 全局重置 & 基础 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a3a5c;
  --primary-light: #2a5a7c;
  --primary-lighter: #3a6a8c;
  --accent: #f0b429;
  --accent2: #e67e22;
  --bg: #f9fafb;
  --bg-card: #ffffff;
  --bg-section: #ffffff;
  --bg-alt: #eef2f7;
  --text: #1f2937;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

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

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 标题 ===== */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5em;
}
h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: -0.02em;
}
h2 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin-top: 2rem;
  position: relative;
  display: inline-block;
  padding-bottom: 0.4rem;
}
h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px;
}
h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  margin-top: 1.5rem;
}
p {
  margin-bottom: 1rem;
  color: var(--text-light);
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: 14px 36px;
  border-radius: 50px;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  box-shadow: 0 4px 15px rgba(26,58,92,0.3);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(26,58,92,0.4);
  text-decoration: none;
  color: #fff;
}
.btn-primary:hover::before {
  left: 100%;
}

/* ===== Header & 导航 ===== */
.site-header {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.sticky {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
}
.logo {
  flex-shrink: 0;
  transition: transform var(--transition);
}
.logo:hover {
  transform: scale(1.05);
}
.nav-list {
  list-style: none;
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-list li a {
  padding: 10px 18px;
  border-radius: 50px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text);
  transition: all var(--transition);
  position: relative;
}
.nav-list li a::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-list li a:hover {
  background: var(--bg-alt);
  color: var(--primary);
  text-decoration: none;
}
.nav-list li a:hover::after {
  width: 60%;
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text);
  padding: 8px;
  border-radius: 8px;
  transition: background var(--transition);
}
.menu-toggle:hover {
  background: var(--bg-alt);
}

/* ===== Hero / Banner ===== */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
}
.hero-slider {
  position: relative;
  width: 100%;
  height: 100%;
}
.slide {
  display: none;
  padding: 100px 24px;
  text-align: center;
  color: #fff;
  min-height: 520px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: linear-gradient(135deg, var(--primary), var(--primary-lighter));
  position: relative;
}
.slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.slide.active {
  display: flex;
  animation: fadeSlide 0.6s ease;
}
@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 2;
}
.hero-content h1 {
  margin-bottom: 0.6rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.15);
}
.hero-content p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 1.8rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.slider-controls {
  position: absolute;
  bottom: 30px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  z-index: 5;
}
.slider-prev, .slider-next {
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  font-size: 1.8rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.slider-prev:hover, .slider-next:hover {
  background: rgba(255,255,255,0.4);
  transform: scale(1.1);
}
.slider-dots {
  display: flex;
  gap: 10px;
}
.dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.dot.active {
  background: #fff;
  border-color: rgba(255,255,255,0.5);
  transform: scale(1.2);
}
.dot:hover {
  background: rgba(255,255,255,0.6);
}

/* ===== 通用区块 ===== */
section {
  padding: 80px 0;
  opacity: 0;
  transform: translateY(30px);
  animation: sectionIn 0.8s ease forwards;
}
@keyframes sectionIn {
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Brand ===== */
.brand {
  background: var(--bg-section);
}
.brand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  margin-top: 40px;
}
.brand-item {
  background: var(--bg-card);
  padding: 32px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 5px solid var(--primary);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.brand-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(26,58,92,0.02), transparent);
  pointer-events: none;
}
.brand-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-left-color: var(--accent);
}
.brand-item h3 {
  margin-top: 0;
  color: var(--primary);
}

/* ===== Products ===== */
.products {
  background: var(--bg);
}
.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}
.product-card {
  background: var(--bg-card);
  padding: 32px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}
.product-card:hover::after {
  transform: scaleX(1);
}
.product-icon {
  margin-bottom: 18px;
  display: inline-block;
  transition: transform var(--transition);
}
.product-card:hover .product-icon {
  transform: scale(1.15) rotate(-5deg);
}
.product-advantages {
  margin-top: 50px;
  background: var(--bg-alt);
  padding: 36px 32px;
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}
.product-advantages ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.product-advantages li {
  padding: 12px 16px;
  background: rgba(255,255,255,0.6);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
  font-weight: 500;
}

/* ===== Solutions ===== */
.solutions {
  background: var(--bg-section);
}
.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  margin-top: 40px;
}
.solution-item {
  background: var(--bg-card);
  padding: 32px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-top: 5px solid var(--primary-light);
  transition: all var(--transition);
}
.solution-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-top-color: var(--accent);
}
.solution-item h3 {
  margin-top: 0;
  color: var(--primary-light);
}

/* ===== Cases ===== */
.cases {
  background: var(--bg);
}
.case-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  margin-top: 40px;
}
.case-card {
  background: var(--bg-card);
  padding: 30px 26px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.case-card h3 {
  margin-top: 0;
  color: var(--primary);
}
.testimonials {
  margin-top: 50px;
  background: var(--bg-alt);
  padding: 36px 32px;
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}
.testimonials blockquote {
  font-style: italic;
  margin-bottom: 18px;
  padding: 16px 20px;
  border-left: 4px solid var(--primary);
  background: rgba(255,255,255,0.5);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  font-size: 1.05rem;
}

/* ===== News ===== */
.news {
  background: var(--bg-section);
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.news-item {
  background: var(--bg-card);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.news-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}
.news-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.news-item:hover::before {
  opacity: 1;
}
.news-item time {
  display: block;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 8px;
}
.read-more {
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}
.read-more:hover {
  gap: 8px;
  text-decoration: none;
}

/* ===== HowTo ===== */
.howto {
  background: var(--bg);
}
.howto-steps {
  list-style: none;
  padding: 0;
  counter-reset: step;
}
.howto-steps li {
  counter-increment: step;
  padding: 18px 20px 18px 60px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  position: relative;
  transition: all var(--transition);
}
.howto-steps li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}
.howto-steps li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-hover);
}
.howto-extra {
  margin-top: 36px;
  background: var(--bg-alt);
  padding: 32px;
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}
.howto-extra h3 {
  color: var(--primary);
  margin-top: 1.5rem;
}
.howto-extra h3:first-child {
  margin-top: 0;
}

/* ===== FAQ ===== */
.faq {
  background: var(--bg-section);
}
.faq-list {
  margin-top: 30px;
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-item {
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  transition: background var(--transition);
}
.faq-item:first-child {
  border-top-left-radius: var(--radius);
  border-top-right-radius: var(--radius);
}
.faq-item:last-child {
  border-bottom: none;
  border-bottom-left-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
}
.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition);
}
.faq-question::after {
  content: '+';
  font-size: 1.6rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 12px;
}
.faq-question[aria-expanded="true"]::after {
  content: '−';
  transform: rotate(180deg);
}
.faq-question:hover {
  background: var(--bg-alt);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  background: var(--bg-alt);
}
.faq-answer p {
  margin-bottom: 0;
  padding: 0 0 18px;
  color: var(--text-light);
}
.faq-item:hover .faq-question {
  color: var(--primary);
}

/* ===== Contact ===== */
.contact {
  background: var(--bg);
}
.contact-info {
  background: var(--bg-card);
  padding: 36px 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: grid;
  gap: 12px;
}
.contact-info p {
  margin-bottom: 0;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
}
.contact-info p:last-child {
  border-bottom: none;
}
.contact-info strong {
  min-width: 120px;
  color: var(--primary);
}

/* ===== Site Map ===== */
.site-map {
  background: var(--bg-section);
}
.sitemap-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 0;
  margin-top: 24px;
}
.sitemap-list li a {
  padding: 10px 20px;
  background: var(--bg-alt);
  border-radius: 50px;
  font-weight: 500;
  transition: all var(--transition);
  display: inline-block;
}
.sitemap-list li a:hover {
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
}

/* ===== Extras ===== */
.extras {
  background: var(--bg);
}
.friend-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 0;
  margin-bottom: 40px;
}
.friend-links li a {
  padding: 8px 18px;
  background: var(--bg-alt);
  border-radius: 50px;
  font-weight: 500;
  transition: all var(--transition);
}
.friend-links li a:hover {
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
}
.legal {
  background: var(--bg-card);
  padding: 36px 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.legal h3 {
  color: var(--primary);
  margin-top: 2rem;
}
.legal h3:first-child {
  margin-top: 0;
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(135deg, var(--primary), #0f2a44);
  color: rgba(255,255,255,0.85);
  padding: 40px 0;
  text-align: center;
}
.site-footer a {
  color: rgba(255,255,255,0.7);
  transition: color var(--transition);
}
.site-footer a:hover {
  color: #fff;
  text-decoration: none;
}
.site-footer p {
  margin-bottom: 8px;
  color: rgba(255,255,255,0.75);
}
.site-footer p:last-child {
  margin-bottom: 0;
}

/* ===== 固定按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.6rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s ease;
  z-index: 999;
  box-shadow: 0 4px 15px rgba(26,58,92,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 25px rgba(26,58,92,0.4);
}
.dark-mode-toggle {
  position: fixed;
  bottom: 92px;
  right: 30px;
  width: 52px;
  height: 52px;
  background: var(--text);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 999;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.dark-mode-toggle:hover {
  transform: scale(1.1);
}

/* ===== 暗黑模式 ===== */
body.dark-mode {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-section: #1e293b;
  --bg-alt: #334155;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --border: #334155;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.4);
}
body.dark-mode .site-header {
  background: rgba(15,23,42,0.85);
  border-bottom-color: rgba(255,255,255,0.05);
}
body.dark-mode .nav-list li a {
  color: var(--text);
}
body.dark-mode .nav-list li a:hover {
  background: var(--bg-alt);
}
body.dark-mode .faq-question {
  color: var(--text);
}
body.dark-mode .faq-answer {
  background: var(--bg);
}
body.dark-mode .product-advantages li {
  background: rgba(255,255,255,0.08);
}
body.dark-mode .testimonials blockquote {
  background: rgba(255,255,255,0.05);
}
body.dark-mode .howto-steps li {
  background: var(--bg-card);
}
body.dark-mode .howto-extra {
  background: var(--bg-alt);
}
body.dark-mode .legal {
  background: var(--bg-card);
}
body.dark-mode .sitemap-list li a,
body.dark-mode .friend-links li a {
  background: var(--bg-alt);
  color: var(--text);
}
body.dark-mode .sitemap-list li a:hover,
body.dark-mode .friend-links li a:hover {
  background: var(--primary);
  color: #fff;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  section {
    padding: 60px 0;
  }
  .hero {
    min-height: 420px;
  }
  .slide {
    min-height: 420px;
    padding: 70px 20px;
  }
}

@media (max-width: 768px) {
  .nav-list {
    display: none;
    flex-direction: column;
    background: var(--bg-card);
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    padding: 12px 0;
    border-radius: 0 0 var(--radius) var(--radius);
    backdrop-filter: blur(20px);
  }
  .nav-list.open {
    display: flex;
  }
  .nav-list li a {
    padding: 14px 24px;
    border-radius: 0;
    font-size: 1rem;
  }
  .nav-list li a::after {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero {
    min-height: 360px;
  }
  .slide {
    min-height: 360px;
    padding: 60px 16px;
  }
  .hero-content h1 {
    font-size: 1.8rem;
  }
  .hero-content p {
    font-size: 1rem;
  }
  h2 {
    font-size: 1.5rem;
  }
  .brand-grid,
  .product-list,
  .solution-grid,
  .case-list,
  .news-grid {
    grid-template-columns: 1fr;
  }
  .product-advantages ul {
    grid-template-columns: 1fr;
  }
  .contact-info p {
    flex-direction: column;
  }
  .contact-info strong {
    min-width: auto;
  }
  .back-to-top {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    bottom: 20px;
    right: 20px;
  }
  .dark-mode-toggle {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    bottom: 74px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  section {
    padding: 40px 0;
  }
  .hero {
    min-height: 300px;
  }
  .slide {
    min-height: 300px;
    padding: 40px 12px;
  }
  .hero-content h1 {
    font-size: 1.5rem;
  }
  .btn-primary {
    padding: 12px 28px;
    font-size: 0.95rem;
  }
  .brand-item,
  .product-card,
  .solution-item,
  .case-card,
  .news-item {
    padding: 20px;
  }
  .howto-steps li {
    padding: 14px 14px 14px 50px;
  }
  .howto-steps li::before {
    width: 28px;
    height: 28px;
    font-size: 0.85rem;
    left: 12px;
  }
  .faq-question {
    padding: 16px 18px;
    font-size: 0.95rem;
  }
  .faq-answer {
    padding: 0 18px;
  }
}

/* ===== 滚动动画增强 ===== */
@media (prefers-reduced-motion: no-preference) {
  .brand-item,
  .product-card,
  .solution-item,
  .case-card,
  .news-item {
    opacity: 0;
    transform: translateY(30px);
    animation: cardIn 0.7s ease forwards;
  }
  .brand-item:nth-child(1) { animation-delay: 0.1s; }
  .brand-item:nth-child(2) { animation-delay: 0.2s; }
  .brand-item:nth-child(3) { animation-delay: 0.3s; }
  .brand-item:nth-child(4) { animation-delay: 0.4s; }
  .product-card:nth-child(1) { animation-delay: 0.1s; }
  .product-card:nth-child(2) { animation-delay: 0.2s; }
  .product-card:nth-child(3) { animation-delay: 0.3s; }
  .solution-item:nth-child(1) { animation-delay: 0.1s; }
  .solution-item:nth-child(2) { animation-delay: 0.2s; }
  .solution-item:nth-child(3) { animation-delay: 0.3s; }
  .solution-item:nth-child(4) { animation-delay: 0.4s; }
  .case-card:nth-child(1) { animation-delay: 0.1s; }
  .case-card:nth-child(2) { animation-delay: 0.2s; }
  .case-card:nth-child(3) { animation-delay: 0.3s; }
  .news-item:nth-child(1) { animation-delay: 0.05s; }
  .news-item:nth-child(2) { animation-delay: 0.1s; }
  .news-item:nth-child(3) { animation-delay: 0.15s; }
  .news-item:nth-child(4) { animation-delay: 0.2s; }
  .news-item:nth-child(5) { animation-delay: 0.25s; }
  .news-item:nth-child(6) { animation-delay: 0.3s; }
  .news-item:nth-child(7) { animation-delay: 0.35s; }
  .news-item:nth-child(8) { animation-delay: 0.4s; }
  .news-item:nth-child(9) { animation-delay: 0.45s; }
  .news-item:nth-child(10) { animation-delay: 0.5s; }
}
@keyframes cardIn {
  to { opacity: 1; transform: translateY(0); }
}