/* =========================================================
   北京雅努斯轨道交通设备有限公司 - 首页样式 (v2)
   品牌色：Logo 蓝 #004CE8 / 深蓝 #002EEC / 藏青 #0A1A4F
   强调色：高级金 #E0A93B
   ========================================================= */

:root {
  --color-primary: #004CE8;
  --color-primary-dark: #002EEC;
  --color-primary-deep: #0A1A4F;
  --color-primary-light: #EAF1FD;
  --color-accent: #E0A93B;
  --color-accent-dark: #C8922B;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-border: #E6ECF5;
  --color-bg: #F4F7FC;
  --color-bg-tint: #EEF4FF;
  --color-white: #FFFFFF;
  --color-black: #0B1220;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px 0 rgba(10, 26, 79, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(10, 26, 79, 0.1), 0 2px 4px -2px rgba(10, 26, 79, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(10, 26, 79, 0.12), 0 4px 6px -4px rgba(10, 26, 79, 0.1);
  --shadow-xl: 0 24px 40px -12px rgba(10, 26, 79, 0.22);
  --transition: all 0.3s ease;
  --container-max: 1200px;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, textarea {
  font-family: inherit;
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部栏 */
.top-bar {
  background: var(--color-primary-deep);
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.85rem;
  padding: 9px 0;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.top-bar-right {
  display: flex;
  gap: 24px;
}

.top-bar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 头部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 78, 232, 0.08);
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  border-bottom-color: rgba(0, 78, 232, 0.12);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 84px;
}

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

.logo img {
  height: 50px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text strong {
  font-size: 1.15rem;
  color: var(--color-primary-deep);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-text span {
  font-size: 0.7rem;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: 34px;
  align-items: center;
}

.main-nav a {
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 8px 0;
  transition: var(--transition);
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: none;
  background: transparent;
  padding: 8px;
  z-index: 1001;
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}

.mobile-menu-btn.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.open span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  box-shadow: 0 8px 22px rgba(0, 78, 232, 0.32);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 78, 232, 0.42);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.55);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn-block {
  width: 100%;
}

/* Hero 区域 */
.hero {
  position: relative;
  min-height: 94vh;
  display: flex;
  align-items: center;
  color: var(--color-white);
  overflow: hidden;
  background:
    radial-gradient(circle at 78% 30%, rgba(0, 78, 232, 0.55) 0%, transparent 55%),
    linear-gradient(135deg, #08153B 0%, #0A1A4F 45%, #002EEC 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(8, 21, 59, 0.92) 0%, rgba(10, 26, 79, 0.7) 45%, rgba(0, 46, 236, 0.45) 100%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 85%);
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 60px;
  padding-top: 70px;
  padding-bottom: 70px;
}

.hero-text {
  max-width: 660px;
}

.hero-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
  padding: 8px 16px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50px;
  margin-bottom: 26px;
}

.hero-text h1 {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.14;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
}

.hero-text p {
  font-size: 1.15rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 38px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex-shrink: 0;
}

.stat-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
  padding: 24px 34px;
  min-width: 190px;
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-4px);
}

.stat-card strong {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
  text-shadow: 0 2px 10px rgba(224, 169, 59, 0.3);
}

.stat-card span {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
}

/* 数据条 */
.trust-bar {
  background: var(--color-primary-deep);
  padding: 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}

.trust-item {
  text-align: center;
  padding: 30px 16px;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.trust-item:last-child {
  border-right: none;
}

.trust-item strong {
  display: block;
  color: var(--color-white);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.trust-item span {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

/* 通用区块 */
.section {
  padding: 104px 0;
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 64px;
}

.section-label {
  display: inline-block;
  color: var(--color-primary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 14px;
  position: relative;
}

.section-label::after {
  content: '';
  display: block;
  width: 44px;
  height: 3px;
  background: var(--color-primary);
  margin: 10px auto 0;
  border-radius: 2px;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--color-text-light);
}

.section-footer {
  text-align: center;
  margin-top: 48px;
}

/* 打磨机系列 */
.section-grinders {
  background: var(--color-white);
}

.grinders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.grinder-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.grinder-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.grinder-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #EDF2F9;
}

.grinder-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.grinder-card:hover .grinder-image img {
  transform: scale(1.06);
}

.grinder-info {
  padding: 30px 28px 32px;
}

.grinder-tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.grinder-info h3 {
  font-size: 1.28rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-black);
}

.grinder-info p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 20px;
}

.grinder-link {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
}

.grinder-link:hover {
  color: var(--color-primary-dark);
  padding-left: 5px;
}

.grinders-footer {
  text-align: center;
  margin-top: 52px;
}

.grinders-footer p {
  color: var(--color-text-light);
  margin-bottom: 22px;
  font-size: 1rem;
}

/* 产品分类 */
.section-categories {
  background: var(--color-bg-tint);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.category-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 42px 34px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

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

.category-icon {
  width: 74px;
  height: 74px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  transition: var(--transition);
}

.category-card:hover .category-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.category-icon svg {
  width: 32px;
  height: 32px;
}

.category-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-black);
}

.category-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.category-link {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
}

.category-card:hover .category-link {
  color: var(--color-primary-dark);
}

/* 产品展示 */
.section-products {
  background: var(--color-white);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--color-border);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.product-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #EDF2F9;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.08);
}

.product-info {
  padding: 24px;
}

.product-info h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-black);
}

.product-info p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.product-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 50px;
}

/* 关于我们 */
.section-about {
  background: var(--color-bg-tint);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: center;
}

.about-image-inner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about-image-inner img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.about-experience {
  position: absolute;
  bottom: -24px;
  right: -24px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: 28px 32px;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-lg);
  min-width: 160px;
}

.about-experience strong {
  display: block;
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 6px;
}

.about-experience span {
  font-size: 0.9rem;
  opacity: 0.95;
  line-height: 1.4;
}

.about-content h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-black);
  margin: 16px 0 24px;
  line-height: 1.3;
}

.about-content p {
  color: var(--color-text-light);
  margin-bottom: 18px;
  line-height: 1.8;
}

.about-features {
  display: flex;
  gap: 24px;
  margin: 28px 0 32px;
}

.about-feature {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--color-text);
}

.about-feature svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
}

/* 核心优势 */
.section-why {
  background: var(--color-white);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 38px 28px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

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

.why-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: var(--transition);
}

.why-card:hover .why-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.why-icon svg {
  width: 28px;
  height: 28px;
}

.why-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-black);
}

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

/* CTA 联系 */
.section-cta {
  background:
    radial-gradient(circle at 80% 20%, rgba(0, 78, 232, 0.5) 0%, transparent 50%),
    linear-gradient(135deg, #08153B 0%, #0A1A4F 55%, #002EEC 100%);
  color: var(--color-white);
  padding: 92px 0;
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.cta-content h2 {
  font-size: 2.4rem;
  font-weight: 700;
  margin: 16px 0 20px;
}

.cta-content p {
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.8;
  margin-bottom: 32px;
}

.cta-content .section-label {
  color: rgba(255, 255, 255, 0.9);
}

.cta-content .section-label::after {
  background: var(--color-accent);
  margin-left: 0;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-item svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--color-accent);
}

.contact-item div {
  display: flex;
  flex-direction: column;
}

.contact-item strong {
  font-size: 0.85rem;
  opacity: 0.75;
  font-weight: 500;
}

.contact-item span {
  font-size: 1.05rem;
  font-weight: 600;
}

.cta-form {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 42px;
  box-shadow: var(--shadow-xl);
}

.cta-form form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.cta-form input,
.cta-form textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--color-text);
  transition: var(--transition);
  background: #FAFBFE;
}

.cta-form input:focus,
.cta-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 4px rgba(0, 78, 232, 0.12);
}

.cta-form textarea {
  resize: vertical;
  min-height: 120px;
}

.captcha-row { display: flex; align-items: center; gap: 10px; margin: 4px 0 6px; }
.captcha-box { display: flex; align-items: center; gap: 6px; flex: 0 0 auto; }
.captcha-box canvas { border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: #f3f6fc; cursor: pointer; }
.captcha-refresh { width: 34px; height: 40px; border: 1px solid var(--color-border); background: #FAFBFE; border-radius: var(--radius-sm); cursor: pointer; font-size: 1.1rem; color: var(--color-primary); }
.captcha-refresh:hover { background: #E9F0FB; }
.captcha-row input { flex: 1 1 auto; }

/* 页脚 */
.site-footer {
  background: var(--color-black);
  color: rgba(255, 255, 255, 0.7);
  padding: 72px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 50px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo img {
  height: 56px;
  background: var(--color-white);
  padding: 8px 14px;
  border-radius: 12px;
}

.footer-brand .logo-text strong {
  color: var(--color-white);
}

.footer-brand .logo-text span {
  color: var(--color-primary);
}

.footer-brand p {
  margin-top: 22px;
  line-height: 1.8;
  font-size: 0.95rem;
}

.footer-links h4,
.footer-contact h4 {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.footer-contact p {
  padding: 6px 0;
  font-size: 0.95rem;
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.footer-bottom p { margin: 0; }

.footer-beian {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.footer-beian a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.55);
  transition: var(--transition);
}

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

.beian-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-4px);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

/* 滚动动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* 响应式 */
@media (max-width: 1024px) {
  .hero-text h1 {
    font-size: 2.8rem;
  }

  .trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .trust-item:nth-child(3) {
    border-right: none;
  }

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

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

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

@media (max-width: 768px) {
  .top-bar-inner {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  .top-bar-right {
    flex-direction: column;
    gap: 4px;
  }

  .header-inner {
    height: 72px;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 32px 40px;
    gap: 0;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .main-nav.open {
    transform: translateX(0);
  }

  .main-nav a {
    display: block;
    width: 100%;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.1rem;
  }

  .main-nav a::after {
    display: none;
  }

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

  .hero-content {
    flex-direction: column;
    text-align: center;
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .hero-text h1 {
    font-size: 2.1rem;
  }

  .hero-text p {
    font-size: 1rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    flex-direction: row;
    gap: 12px;
    width: 100%;
  }

  .stat-card {
    padding: 16px 20px;
    min-width: auto;
    flex: 1;
  }

  .stat-card strong {
    font-size: 1.6rem;
  }

  .stat-card span {
    font-size: 0.78rem;
  }

  .section {
    padding: 72px 0;
  }

  .section-header h2 {
    font-size: 1.9rem;
  }

  .categories-grid,
  .products-grid,
  .why-grid,
  .about-grid,
  .cta-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .about-image {
    order: -1;
  }

  .about-experience {
    bottom: 20px;
    right: 20px;
    padding: 18px 22px;
  }

  .about-experience strong {
    font-size: 1.8rem;
  }

  .about-features {
    flex-direction: column;
    gap: 12px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    flex-direction: column;
  }

  .stat-card {
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* =========================================================
   内页（产品中心 / 新闻 / 关于 / 联系）通用样式
   ========================================================= */

/* 内页头部横幅 */
.page-hero {
  position: relative;
  background:
    radial-gradient(circle at 80% 20%, rgba(0, 78, 232, 0.5) 0%, transparent 55%),
    linear-gradient(135deg, #08153B 0%, #0A1A4F 55%, #002EEC 100%);
  color: var(--color-white);
  padding: 78px 0 64px;
  text-align: center;
  overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 0%, black, transparent 70%);
  -webkit-mask-image: radial-gradient(circle at 50% 0%, black, transparent 70%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 {
  font-size: 2.6rem; font-weight: 800; margin-bottom: 14px; letter-spacing: -0.01em;
}
.page-hero p { color: rgba(255,255,255,0.82); font-size: 1.05rem; }

.breadcrumb {
  display: inline-flex; gap: 8px; align-items: center;
  font-size: 0.85rem; color: rgba(255,255,255,0.7);
  margin-bottom: 16px; padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.22); border-radius: 50px;
}
.breadcrumb a { color: rgba(255,255,255,0.85); }
.breadcrumb a:hover { color: #fff; }

/* 内页区块 */
.inner-section { padding: 80px 0; }
.inner-section.alt { background: var(--color-bg-tint); }
.inner-section.white { background: var(--color-white); }

/* 筛选栏 */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: center;
  margin-bottom: 48px;
}
.filter-pills { display: flex; flex-wrap: wrap; gap: 10px; }
.filter-pill {
  padding: 9px 20px; border-radius: 50px; font-size: 0.92rem; font-weight: 600;
  border: 1px solid var(--color-border); background: var(--color-white); color: var(--color-text);
  cursor: pointer; transition: var(--transition);
}
.filter-pill:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-pill.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.filter-search {
  display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--color-border); border-radius: 50px; padding: 6px 8px 6px 16px; background: #fff;
}
.filter-search input { border: none; outline: none; font-size: 0.92rem; width: 200px; background: transparent; }
.filter-search button {
  border: none; background: var(--color-primary); color: #fff; border-radius: 50px;
  padding: 7px 16px; font-weight: 600; cursor: pointer; transition: var(--transition);
}
.filter-search button:hover { background: var(--color-primary-dark); }

/* 产品卡片 hover 跳详情 */
.product-card a.card-link { color: inherit; display: block; }
.product-card .product-info h3 a { color: var(--color-black); }

/* 产品详情 */
.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.product-gallery .main-image {
  border-radius: var(--radius-lg); overflow: hidden; background: #EDF2F9; aspect-ratio: 4/3;
  box-shadow: var(--shadow-md);
}
.product-gallery .main-image img { width: 100%; height: 100%; object-fit: cover; }
.product-thumbs { display: flex; gap: 12px; margin-top: 14px; flex-wrap: wrap; }
.product-thumbs img {
  width: 84px; height: 84px; object-fit: cover; border-radius: var(--radius-sm);
  border: 2px solid transparent; cursor: pointer; background: #EDF2F9;
}
.product-thumbs img.active { border-color: var(--color-primary); }
.product-info-detail .tag {
  display: inline-block; background: var(--color-primary-light); color: var(--color-primary-dark);
  font-size: 0.78rem; font-weight: 700; padding: 6px 14px; border-radius: 50px; margin-bottom: 16px;
}
.product-info-detail h1 { font-size: 2.1rem; font-weight: 800; color: var(--color-black); margin-bottom: 10px; }
.product-info-detail .model { color: var(--color-primary); font-weight: 600; margin-bottom: 22px; }
.product-info-detail .summary { font-size: 1.05rem; color: var(--color-text-light); line-height: 1.8; margin-bottom: 22px; }
.product-info-detail .detail-body { color: var(--color-text); line-height: 1.9; margin-bottom: 28px; }
.product-info-detail .detail-body p { margin-bottom: 14px; }
.product-info-detail .detail-body img { max-width: 100%; height: auto; border-radius: 8px; margin: 10px 0; }
.product-info-detail .detail-body table { border-collapse: collapse; width: 100%; margin: 14px 0; }
.product-info-detail .detail-body table td,
.product-info-detail .detail-body table th { border: 1px solid #cdd6e4; padding: 8px 10px; }
.product-info-detail .detail-body h1,
.product-info-detail .detail-body h2,
.product-info-detail .detail-body h3 { margin: 18px 0 10px; color: var(--color-black); }
.product-meta { border-top: 1px solid var(--color-border); padding-top: 20px; margin-top: 8px; }
.product-meta div { display: flex; gap: 10px; padding: 7px 0; color: var(--color-text-light); }
.product-meta strong { color: var(--color-text); min-width: 72px; }

/* 新闻列表 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.news-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm); transition: var(--transition);
}
.news-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); border-color: var(--color-primary); }
.news-card .news-image { aspect-ratio: 16/9; overflow: hidden; background: #EDF2F9; }
.news-card .news-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.news-card:hover .news-image img { transform: scale(1.06); }
.news-card .news-body { padding: 24px; }
.news-card .news-date { color: var(--color-primary); font-size: 0.82rem; font-weight: 600; }
.news-card h3 { font-size: 1.12rem; font-weight: 700; margin: 10px 0 10px; color: var(--color-black); line-height: 1.4; }
.news-card p { font-size: 0.9rem; color: var(--color-text-light); line-height: 1.6; }

/* 新闻详情 */
.news-detail { max-width: 820px; margin: 0 auto; }
.news-detail .news-cover { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 30px; box-shadow: var(--shadow-md); }
.news-detail .news-cover img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.news-detail h1 { font-size: 2.2rem; font-weight: 800; color: var(--color-black); margin-bottom: 14px; line-height: 1.3; }
.news-detail .news-meta { color: var(--color-text-light); margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--color-border); }
.news-detail .news-content { font-size: 1.05rem; line-height: 1.95; color: var(--color-text); }
.news-detail .news-content p { margin-bottom: 18px; }
.news-detail .news-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 12px 0; }
.news-detail .news-content table { border-collapse: collapse; width: 100%; margin: 16px 0; }
.news-detail .news-content table td,
.news-detail .news-content table th { border: 1px solid #cdd6e4; padding: 8px 10px; }
.news-detail .news-content h1,
.news-detail .news-content h2,
.news-detail .news-content h3 { margin: 20px 0 12px; color: var(--color-black); }

/* 分页 */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 48px; }
.pagination button {
  min-width: 42px; height: 42px; border-radius: var(--radius-sm); border: 1px solid var(--color-border);
  background: #fff; color: var(--color-text); font-weight: 600; cursor: pointer; transition: var(--transition);
}
.pagination button:hover:not(:disabled) { border-color: var(--color-primary); color: var(--color-primary); }
.pagination button.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.pagination button:disabled { opacity: 0.4; cursor: not-allowed; }

/* 空状态 / 加载 */
.empty {
  text-align: center; padding: 60px 20px; color: var(--color-text-light); font-size: 1.05rem;
}
.loading {
  text-align: center; padding: 50px 20px; color: var(--color-text-light);
}
.spinner {
  width: 34px; height: 34px; border: 3px solid var(--color-border); border-top-color: var(--color-primary);
  border-radius: 50%; margin: 0 auto 14px; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* CTA 段落（内页复用首页联系区） */
.section-cta.inner { background:
  radial-gradient(circle at 80% 20%, rgba(0,78,232,0.5) 0%, transparent 50%),
  linear-gradient(135deg, #08153B 0%, #0A1A4F 55%, #002EEC 100%);
  color: #fff; padding: 80px 0;
}

@media (max-width: 900px) {
  .product-detail { grid-template-columns: 1fr; gap: 32px; }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .news-grid { grid-template-columns: 1fr; }
  .page-hero h1 { font-size: 1.9rem; }
  .filter-search input { width: 130px; }
}