/* 钰联新材 - 全局样式 */
:root {
  --primary: #0e4a6e;
  --primary-dark: #08324c;
  --accent: #17a2b8;
  --accent-light: #1bc4d4;
  --text: #333;
  --text-light: #666;
  --text-white: #fff;
  --bg-light: #f7f9fb;
  --bg-gray: #eef2f5;
  --border: #e0e6eb;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --radius: 6px;
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: #fff;
}

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

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

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

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.5);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
}

.banner .btn-outline {
  background: transparent;
  color: #d6eff5;
  border: 2px solid rgba(214,239,245,0.7);
}

.banner .btn-outline:hover {
  background: #d6eff5;
  color: var(--primary);
}

.btn-dark {
  background: var(--primary);
  color: #fff;
}

.btn-dark:hover {
  background: var(--primary-dark);
}

/* 头部导航 */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
}

.logo-img {
  height: 44px;
  width: auto;
  display: block;
}

.nav {
  display: flex;
  gap: 40px;
}

.nav a {
  font-size: 15px;
  color: var(--text);
  position: relative;
  padding: 5px 0;
  transition: color 0.3s;
}

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

.nav a.active::after,
.nav a:hover::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
}

.header-btn {
  display: inline-block;
  padding: 10px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 14px;
  transition: background 0.3s;
}

.header-btn:hover {
  background: var(--accent-light);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--primary);
  cursor: pointer;
}

/* 横幅通用 */
.banner {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.banner-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8,50,76,0.92) 0%, rgba(14,90,125,0.85) 100%);
}

.banner .container {
  position: relative;
  z-index: 1;
}

.banner-title {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 16px;
}

.banner-subtitle {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 32px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.banner-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* 首页横幅特色 */
.home-banner {
  min-height: 620px;
}

.home-banner .banner-title {
  font-size: 48px;
}

/* 统计数据条 */
.stats-bar {
  background: var(--primary-dark);
  color: #fff;
  padding: 50px 0;
}

.stats-bar .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item .stat-num {
  font-size: 42px;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 8px;
}

.stat-item .stat-label {
  font-size: 15px;
  opacity: 0.85;
}

/* 区块标题 */
.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* 通用区块 */
.section {
  padding: 80px 0;
}

.section-light {
  background: #fff;
}

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

.section-dark {
  background: var(--primary-dark);
  color: #fff;
}

.section-dark .section-title {
  color: #fff;
}

.section-dark .section-desc {
  color: rgba(255,255,255,0.75);
}

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

.product-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  cursor: pointer;
  border: 1px solid var(--border);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}

.product-card .icon {
  width: 72px;
  height: 72px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  overflow: hidden;
  padding: 4px;
}

.product-card .icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
  transition: transform 0.3s;
}

.product-card:hover .icon img {
  transform: scale(1.05);
}

.product-card h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 10px;
}

.product-card h3 span {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 400;
  margin-left: 6px;
}

.product-card p {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.7;
}

.product-card .features {
  list-style: none;
}

.product-card .features li {
  font-size: 13px;
  color: var(--text-light);
  padding-left: 18px;
  position: relative;
  margin-bottom: 6px;
}

.product-card .features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.product-card .product-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 20px;
  background: var(--bg-light);
}

/* 应用领域 */
.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.app-card {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.1);
  transition: background 0.3s;
}

.app-card:hover {
  background: rgba(255,255,255,0.1);
}

.app-card .icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
}

.app-card h4 {
  font-size: 18px;
  margin-bottom: 8px;
}

.app-card p {
  font-size: 13px;
  opacity: 0.8;
}

/* 为什么选择我们 */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.why-card {
  padding: 28px;
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

.why-card:hover {
  box-shadow: var(--shadow);
}

.why-card .num {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}

.why-card h4 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 10px;
}

.why-card p {
  font-size: 14px;
  color: var(--text-light);
}

/* CTA 区域 */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #fff;
  text-align: center;
  padding: 70px 0;
}

.cta-section h3 {
  font-size: 28px;
  margin-bottom: 12px;
}

.cta-section p {
  opacity: 0.85;
  margin-bottom: 24px;
}

/* 页脚 */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.85);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 50px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand .logo img {
  background: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  max-width: 160px;
  height: auto;
  display: block;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  opacity: 0.8;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 20px;
}

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

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

.footer-col a {
  font-size: 14px;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.footer-col a:hover {
  opacity: 1;
  color: var(--accent-light);
}

.footer-col .contact-line {
  font-size: 14px;
  margin-bottom: 10px;
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  opacity: 0.6;
}

.footer-bottom a {
  color: inherit;
  text-decoration: underline;
}

.footer-bottom a:hover {
  opacity: 1;
}

/* 产品中心页面 */
.product-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

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

.product-row:nth-child(even) {
  direction: rtl;
}

.product-row:nth-child(even) > * {
  direction: ltr;
}

.product-row .image-col img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.product-row .text-col h3 {
  font-size: 26px;
  color: var(--primary);
  margin-bottom: 12px;
}

.product-row .text-col h3 span {
  font-size: 16px;
  color: var(--accent);
  font-weight: 400;
  margin-left: 8px;
}

.product-row .text-col p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.detail-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-weight: 500;
  transition: gap 0.3s;
}

.detail-link:hover {
  gap: 10px;
}

/* 产品子菜单（如正极辅材下的分散剂 / 增柔剂） */
.sub-menu {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.sub-menu-label {
  font-size: 14px;
  color: var(--text-light);
}
.sub-menu a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  background: rgba(23,162,184,0.1);
  border: 1px solid rgba(23,162,184,0.28);
  border-radius: 8px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s;
}
.sub-menu a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.sub-menu a i {
  font-size: 12px;
}

/* 产品中心型号标签（可点击跳转说明书） */
.model-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}
.model-chips-label {
  font-size: 14px;
  color: var(--text-light);
}
.model-chips a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  background: #f1f7f9;
  border: 1px solid rgba(23,162,184,0.25);
  border-radius: 20px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.25s;
}
.model-chips a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* 技术优势 */
.tech-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.tech-hero .text h2 {
  font-size: 34px;
  color: #fff;
  margin-bottom: 20px;
}

.tech-hero .text h2 strong {
  color: var(--accent-light);
}

.tech-hero .text p {
  opacity: 0.85;
  margin-bottom: 24px;
  line-height: 1.8;
}

.tech-hero .image img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.tech-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 60px;
}

.tech-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.tech-card .icon {
  width: 48px;
  height: 48px;
  background: rgba(23,162,184,0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 22px;
  margin-bottom: 16px;
}

.tech-card h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 12px;
}

.tech-card p {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.tech-card .sub-list {
  list-style: none;
}

.tech-card .sub-list li {
  font-size: 13px;
  color: var(--text-light);
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}

.tech-card .sub-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* 设备表格 */
.equipment-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.equipment-table th,
.equipment-table td {
  padding: 16px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.equipment-table th {
  background: var(--primary);
  color: #fff;
  font-weight: 500;
}

.equipment-table tr:last-child td {
  border-bottom: none;
}

.equipment-table td {
  color: var(--text-light);
}

/* 关于我们 */
.about-intro {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: start;
  margin-bottom: 80px;
}

.about-intro .text h2 {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 20px;
}

.about-intro .text p {
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.about-stats .about-stat {
  background: #fff;
  border-radius: 12px;
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow);
}

.about-stats .about-stat .num {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}

.about-stats .about-stat .label {
  font-size: 14px;
  color: var(--text-light);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 20px 40px;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-item::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  top: 26px;
}

.timeline-item:nth-child(odd)::before {
  right: -7px;
}

.timeline-item:nth-child(even)::before {
  left: -7px;
}

.timeline-item .year {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}

.timeline-item .event {
  font-size: 14px;
  color: var(--text-light);
}

/* 联系我们 */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
  margin-bottom: 60px;
}

.contact-info h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-item .icon {
  width: 44px;
  height: 44px;
  background: rgba(23,162,184,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 18px;
  flex-shrink: 0;
}

.contact-item .info h4 {
  font-size: 15px;
  color: var(--primary);
  margin-bottom: 4px;
}

.contact-item .info p {
  font-size: 14px;
  color: var(--text-light);
}

.contact-form {
  background: #fff;
  border-radius: 12px;
  padding: 36px;
  box-shadow: var(--shadow);
}

.contact-form h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 24px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 6px;
}

.form-group label .required {
  color: #e74c3c;
  margin-left: 2px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  transition: border-color 0.3s;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.contact-form .btn {
  width: 100%;
}

/* FAQ */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  background: #fff;
}

.faq-question {
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 16px;
  font-weight: 500;
  color: var(--primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

/* 产品详情页 */
.detail-hero {
  background: var(--bg-light);
  padding: 60px 0;
}

.detail-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: center;
}

.detail-layout img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.detail-layout h1 {
  font-size: 34px;
  color: var(--primary);
  margin-bottom: 8px;
}

.detail-layout .en-name {
  color: var(--accent);
  font-size: 16px;
  margin-bottom: 20px;
}

.detail-layout p {
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 24px;
}

.detail-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.detail-meta .meta-item {
  background: #fff;
  padding: 16px;
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.detail-meta .meta-item h4 {
  font-size: 14px;
  color: var(--primary);
  margin-bottom: 4px;
}

.detail-meta .meta-item p {
  font-size: 13px;
  color: var(--text-light);
  margin: 0;
}

.detail-section {
  padding: 60px 0;
}

.detail-section h2 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 24px;
}

.detail-section ul {
  list-style: none;
}

.detail-section li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-light);
  padding-left: 24px;
  position: relative;
}

.detail-section li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* 响应式 */
@media (max-width: 992px) {
  .nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    gap: 16px;
  }

  .nav.open {
    display: flex;
  }

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

  .header-btn {
    display: none;
  }

  .products-grid,
  .why-grid,
  .app-grid,
  .tech-cards,
  .stats-bar .container {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-row,
  .tech-hero,
  .about-intro,
  .contact-layout,
  .detail-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    left: 0 !important;
    padding-left: 50px;
    text-align: left !important;
  }

  .timeline-item::before {
    left: 14px !important;
    right: auto !important;
  }
}

/* 产品说明书 */
.manual-hero {
  background: var(--bg-light);
  padding: 60px 0;
}

.manual-hero .container {
  max-width: 900px;
}

.manual-hero h1 {
  font-size: 34px;
  color: var(--primary);
  margin-bottom: 8px;
}

.manual-hero .subtitle {
  color: var(--accent);
  font-size: 18px;
  margin-bottom: 24px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}

.spec-table th,
.spec-table td {
  padding: 14px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}

.spec-table th {
  background: var(--primary);
  color: #fff;
  font-weight: 500;
}

.spec-table td {
  color: var(--text-light);
}

.spec-table tbody tr:last-child td,
.spec-table tbody tr:last-child th {
  border-bottom: none;
}

.manual-section {
  padding: 40px 0;
}

.manual-section .container {
  max-width: 900px;
}

.manual-section h2 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.manual-section p {
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 16px;
}

.manual-section ul {
  list-style: none;
  margin-bottom: 20px;
}

.manual-section li {
  padding: 8px 0;
  color: var(--text-light);
  padding-left: 22px;
  position: relative;
}

.manual-section li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.variant-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.variant-card {
  background: #fff;
  border-radius: 12px;
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform 0.3s, box-shadow 0.3s;
}

.variant-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}

.variant-card .model {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.variant-card h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 12px;
}

.variant-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.variant-card .btn {
  width: 100%;
  text-align: center;
}

@media (max-width: 576px) {
  .products-grid,
  .why-grid,
  .app-grid,
  .tech-cards,
  .stats-bar .container,
  .footer-grid,
  .about-stats,
  .form-row,
  .detail-meta,
  .variant-grid {
    grid-template-columns: 1fr;
  }

  .banner-title {
    font-size: 30px !important;
  }

  .section-title {
    font-size: 24px;
  }

  .product-row:nth-child(even) {
    direction: ltr;
  }
}

/* 产品详情页新版式 */
.manual-breadcrumb {
  background: #f8fafc;
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  font-size: 13px;
  color: var(--text-light);
}

.manual-breadcrumb a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.3s;
}

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

.manual-breadcrumb .sep {
  margin: 0 10px;
  font-size: 11px;
  color: #cbd5e1;
}

.manual-breadcrumb .current {
  color: var(--primary);
  font-weight: 500;
}

.manual-hero-v2 {
  background: linear-gradient(135deg, var(--primary) 0%, #1565a8 100%);
  color: #fff;
  padding: 70px 0 90px;
  position: relative;
  overflow: hidden;
}

.manual-hero-v2::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.manual-hero-v2 .hero-v2-inner {
  position: relative;
  z-index: 1;
}

.manual-hero-v2 .hero-tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 2px;
  opacity: 0.8;
  margin-bottom: 12px;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 4px 12px;
  border-radius: 20px;
}

.manual-hero-v2 h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}

.manual-hero-v2 .hero-subtitle {
  font-size: 22px;
  opacity: 0.9;
}

.product-sheet {
  background: var(--bg-light);
  padding: 60px 0 80px;
  margin-top: -40px;
}

.sheet-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 40px;
  align-items: start;
}

.product-visual {
  position: sticky;
  top: 90px;
}

.visual-card {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.visual-card img {
  width: 100%;
  border-radius: 12px;
  display: block;
}

.visual-info {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.series-label {
  font-size: 14px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.3s;
}

.back-link:hover {
  color: var(--accent);
}

.product-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.content-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.content-card h2 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-card h2 i {
  color: var(--accent);
  font-size: 22px;
}

.content-card p {
  color: var(--text-light);
  line-height: 1.9;
}

.lead-text {
  font-size: 16px;
  color: var(--text);
  font-weight: 500;
}

.spec-table.compact th,
.spec-table.compact td {
  padding: 12px 18px;
  font-size: 14px;
}

.recipe-table th,
.recipe-table td {
  text-align: left;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  background: var(--bg-light);
  border-radius: 10px;
  color: var(--text-light);
  font-size: 14px;
  line-height: 1.7;
}

.feature-item i {
  color: var(--accent);
  margin-top: 3px;
  flex-shrink: 0;
}

.check-list {
  list-style: none;
}

.check-list li {
  padding: 10px 0 10px 28px;
  color: var(--text-light);
  line-height: 1.8;
  position: relative;
  border-bottom: 1px dashed var(--border);
}

.check-list li:last-child {
  border-bottom: none;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 17px;
  width: 5px;
  height: 9px;
  border: solid var(--accent);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.content-card.caution {
  background: #fffbf0;
  border-color: #f5d98e;
}

.content-card.caution p {
  color: #7a5c1c;
}

.content-card.action {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: center;
}

.content-card.action .btn {
  min-width: 180px;
  text-align: center;
}

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

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

@media (max-width: 992px) {
  .sheet-layout {
    grid-template-columns: 1fr;
  }

  .product-visual {
    position: static;
    max-width: 400px;
    margin: 0 auto 20px;
  }

  .manual-hero-v2 h1 {
    font-size: 36px;
  }
}

@media (max-width: 576px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .content-card {
    padding: 24px;
  }

  .manual-hero-v2 {
    padding: 50px 0 70px;
  }

  .manual-hero-v2 h1 {
    font-size: 30px;
  }

  .manual-hero-v2 .hero-subtitle {
    font-size: 18px;
  }
}

/* QR codes in homepage footer (right side) */
.footer.has-qr .footer-grid {
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr 1.3fr;
}

.footer-qr .qr-wrap {
  display: flex;
  gap: 14px;
}

.footer-qr .qr-item {
  text-align: center;
}

.footer-qr .qr-item img {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 8px;
  display: block;
  margin: 0 auto 8px;
  border: 4px solid rgba(255, 255, 255, 0.85);
}

.footer-qr .qr-item span {
  display: block;
  font-size: 13px;
  color: #fff;
  opacity: 0.85;
  line-height: 1.2;
}

@media (max-width: 992px) {
  .footer.has-qr .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-qr {
    grid-column: 1 / -1;
  }

  .footer-qr .qr-wrap {
    justify-content: flex-start;
  }
}