/* ===== 全局重置与基础变量 ===== */
:root {
  --primary: #0F4C81;
  --primary-light: #4978A8;
  --dark: #333333;
  --dark-title: #222222;
  --text-body: #555555;
  --light-bg: #F5F7FA;
  --white: #FFFFFF;
  --border: #E0E4EA;
  --radius: 6px;
  --shadow: 0 2px 12px rgba(15, 76, 129, 0.08);
  --shadow-hover: 0 6px 24px rgba(15, 76, 129, 0.15);
  --transition: all 0.3s ease;
  --max-width: 1200px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-body);
  background: var(--white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ===== 通用板块 ===== */
.section {
  padding: 80px 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--dark-title);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--primary);
  margin: 12px auto 0;
  border-radius: 2px;
}

.section-title p {
  font-size: 16px;
  color: var(--text-body);
  margin-top: 8px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  text-align: center;
  line-height: 1.5;
}

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

.btn-primary:hover {
  background: #0d3f6d;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--white);
}

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

.btn-outline-dark {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

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

/* ===== 顶部导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--white);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  transition: var(--transition);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  padding: 8px 18px;
  font-size: 15px;
  color: var(--dark);
  border-radius: var(--radius);
  font-weight: 500;
  position: relative;
}

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

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--dark);
  border-radius: 1px;
  transition: var(--transition);
}

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

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

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

/* ===== Banner ===== */
.banner {
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, #0a3560 0%, var(--primary) 50%, var(--primary-light) 100%);
  overflow: hidden;
  margin-top: 72px;
}

.banner-bg {
  position: absolute;
  inset: 0;
  opacity: 0.08;
}

.banner-bg svg {
  width: 100%;
  height: 100%;
}

.banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  padding: 40px 24px;
}

.banner-content h1 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.banner-content .subtitle {
  font-size: 20px;
  opacity: 0.9;
  margin-bottom: 12px;
  font-weight: 400;
}

.banner-content .desc {
  font-size: 16px;
  opacity: 0.75;
  margin-bottom: 36px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

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

/* 内页 Banner */
.page-banner {
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a3560 0%, var(--primary) 100%);
  margin-top: 72px;
  position: relative;
  overflow: hidden;
}

.page-banner .banner-bg {
  position: absolute;
  inset: 0;
  opacity: 0.06;
}

.page-banner .banner-bg svg {
  width: 100%;
  height: 100%;
}

.page-banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  padding: 40px 24px;
}

.page-banner-content h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-banner-content p {
  font-size: 16px;
  opacity: 0.8;
}

/* ===== 企业简介板块 ===== */
.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-preview-text h3 {
  font-size: 24px;
  color: var(--dark-title);
  margin-bottom: 16px;
}

.about-preview-text p {
  margin-bottom: 16px;
  line-height: 1.9;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.stat-item {
  padding: 20px;
  background: var(--light-bg);
  border-radius: var(--radius);
  text-align: center;
  border-left: 3px solid var(--primary);
}

.stat-item .num {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.stat-item .label {
  font-size: 13px;
  color: var(--text-body);
  margin-top: 4px;
}

.about-preview-img {
  background: var(--light-bg);
  border-radius: var(--radius);
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about-preview-img .placeholder-icon {
  font-size: 80px;
  color: var(--primary-light);
  opacity: 0.3;
}

/* ===== 核心业务卡片 ===== */
.business-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.business-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 3px solid transparent;
  text-align: center;
}

.business-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-top-color: var(--primary);
}

.business-card .icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: var(--light-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary);
}

.business-card h4 {
  font-size: 17px;
  color: var(--dark-title);
  margin-bottom: 10px;
  font-weight: 600;
}

.business-card p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.7;
}

/* ===== 解决方案板块 ===== */
.solution-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.solution-item {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.solution-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.solution-item .img-box {
  height: 180px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 40px;
  opacity: 0.7;
}

.solution-item .info {
  padding: 24px;
}

.solution-item h4 {
  font-size: 18px;
  color: var(--dark-title);
  margin-bottom: 8px;
  font-weight: 600;
}

.solution-item p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 16px;
}

.solution-item .link {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
}

.solution-item .link:hover {
  color: #0d3f6d;
}

/* ===== 产品预览 ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-item {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.product-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.product-item .img-box {
  height: 160px;
  background: var(--light-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: var(--primary-light);
  opacity: 0.5;
}

.product-item .info {
  padding: 16px 20px;
}

.product-item h4 {
  font-size: 15px;
  color: var(--dark-title);
  margin-bottom: 4px;
  font-weight: 600;
}

.product-item p {
  font-size: 13px;
  color: var(--text-body);
}

/* ===== 案例展示 ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-item {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.case-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.case-item .img-box {
  height: 200px;
  background: linear-gradient(135deg, #e8eef5, var(--light-bg));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--primary-light);
  opacity: 0.4;
}

.case-item .info {
  padding: 20px 24px;
}

.case-item .tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--light-bg);
  color: var(--primary);
  font-size: 12px;
  border-radius: 3px;
  margin-bottom: 8px;
}

.case-item h4 {
  font-size: 16px;
  color: var(--dark-title);
  margin-bottom: 6px;
  font-weight: 600;
}

.case-item p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ===== 核心优势 ===== */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.advantage-item {
  text-align: center;
  padding: 32px 20px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.advantage-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.advantage-item .icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  background: var(--light-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--primary);
}

.advantage-item h4 {
  font-size: 16px;
  color: var(--dark-title);
  margin-bottom: 8px;
  font-weight: 600;
}

.advantage-item p {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ===== 新闻资讯 ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-item {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.news-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.news-item .img-box {
  height: 160px;
  background: var(--light-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--primary-light);
  opacity: 0.4;
}

.news-item .info {
  padding: 20px;
}

.news-item .date {
  font-size: 13px;
  color: var(--primary-light);
  margin-bottom: 6px;
}

.news-item h4 {
  font-size: 16px;
  color: var(--dark-title);
  margin-bottom: 8px;
  font-weight: 600;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-item p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== 联系区位 ===== */
.contact-section {
  background: var(--light-bg);
}

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

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contact-info-item .icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: var(--light-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--primary);
}

.contact-info-item h4 {
  font-size: 15px;
  color: var(--dark-title);
  margin-bottom: 4px;
  font-weight: 600;
}

.contact-info-item p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col h4 {
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 8px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--white);
  padding-left: 4px;
}

.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* ===== 关于我们 - 发展历程 ===== */
.timeline {
  position: relative;
  padding: 20px 0;
}

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

.timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 40px;
  position: relative;
}

.timeline-item:nth-child(odd) {
  flex-direction: row;
  padding-right: calc(50% + 30px);
  text-align: right;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
  padding-left: calc(50% + 30px);
  text-align: left;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border: 3px solid var(--white);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-item .year {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.timeline-item .content {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.7;
}

/* ===== 内页通用 ===== */
.page-content {
  padding: 60px 0;
}

.content-section {
  margin-bottom: 60px;
}

.content-section h3 {
  font-size: 22px;
  color: var(--dark-title);
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 3px solid var(--primary);
}

.content-section p {
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 12px;
}

/* 算法子项 */
.algo-sub {
  margin-top: 28px;
  padding: 28px;
  background: #f7f9fc;
  border: 1px solid #e3eaf3;
  border-left: 3px solid var(--primary);
  border-radius: var(--radius);
}

.algo-sub h4 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 14px;
}

/* 解决方案详情 */
.solution-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.solution-detail-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border-top: 3px solid var(--primary);
}

.solution-detail-card .icon {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 16px;
}

.solution-detail-card h4 {
  font-size: 18px;
  color: var(--dark-title);
  margin-bottom: 12px;
  font-weight: 600;
}

.solution-detail-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

.solution-detail-card ul {
  margin-top: 12px;
}

.solution-detail-card ul li {
  font-size: 14px;
  color: var(--text-body);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.solution-detail-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--primary-light);
  border-radius: 50%;
}

/* 产品详情 */
.product-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-detail-item {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.product-detail-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.product-detail-item .img-box {
  height: 200px;
  background: var(--light-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: var(--primary-light);
  opacity: 0.4;
}

.product-detail-item .info {
  padding: 20px;
}

.product-detail-item h4 {
  font-size: 16px;
  color: var(--dark-title);
  margin-bottom: 6px;
  font-weight: 600;
}

.product-detail-item .desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 8px;
}

.product-detail-item .features {
  font-size: 13px;
  color: var(--primary-light);
}

/* 联系表单 */
.contact-form {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  color: var(--dark-title);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--dark);
  background: var(--white);
  transition: var(--transition);
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.1);
}

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

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

/* 地图占位 */
.map-placeholder {
  width: 100%;
  height: 300px;
  background: var(--light-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-light);
  font-size: 16px;
}

/* 新闻详情列表 */
.news-list-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.news-list-item:hover {
  background: var(--light-bg);
  padding-left: 8px;
}

.news-list-item .date-box {
  min-width: 70px;
  text-align: center;
  background: var(--light-bg);
  border-radius: var(--radius);
  padding: 12px 8px;
}

.news-list-item .date-box .day {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.news-list-item .date-box .month {
  font-size: 13px;
  color: var(--text-body);
}

.news-list-item .info h4 {
  font-size: 16px;
  color: var(--dark-title);
  margin-bottom: 6px;
  font-weight: 600;
}

.news-list-item .info p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 企业实力 */
.strength-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.strength-item {
  padding: 28px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-top: 3px solid var(--primary);
}

.strength-item .icon {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 12px;
}

.strength-item h4 {
  font-size: 16px;
  color: var(--dark-title);
  margin-bottom: 8px;
  font-weight: 600;
}

.strength-item p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.7;
}

/* Header 滚动效果 */
.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
  position: fixed;
}

.header.scrolled .nav-menu a {
  color: var(--dark);
}

.header.scrolled .logo {
  color: var(--primary);
}

/* ===== 产品特性布局 ===== */
.product-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.feature-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--light-bg);
  border-radius: var(--radius);
  transition: var(--transition);
}

.feature-item:hover {
  background: var(--white);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.feature-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: var(--white);
  border-radius: var(--radius);
  font-size: 18px;
}

.feature-text h5 {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark-title);
  margin-bottom: 4px;
}

.feature-text p {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ===== 案例卡片 ===== */
.case-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.case-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.case-header {
  padding: 24px 28px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.case-tag {
  display: inline-block;
  padding: 3px 12px;
  background: var(--primary);
  color: var(--white);
  border-radius: 3px;
  font-size: 12px;
  font-weight: 500;
}

.case-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--dark-title);
  flex: 1;
}

.case-body {
  padding: 24px 28px;
}

.case-info p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 16px;
}

.case-meta {
  display: flex;
  gap: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.case-meta span {
  font-size: 13px;
  color: var(--text-body);
}

.case-meta strong {
  color: var(--primary);
  font-weight: 600;
}

/* ===== 新闻列表(列表式) ===== */
.news-list {
  display: flex;
  flex-direction: column;
}

.news-list .news-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
  align-items: flex-start;
}

.news-list .news-item:hover {
  padding-left: 8px;
  background: var(--light-bg);
  border-radius: var(--radius);
}

.news-date {
  flex-shrink: 0;
  min-width: 72px;
  text-align: center;
  background: var(--light-bg);
  border-radius: var(--radius);
  padding: 12px 8px;
}

.news-date .day {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.news-date .month {
  display: block;
  font-size: 13px;
  color: var(--text-body);
  margin-top: 2px;
}

.news-body {
  flex: 1;
}

.news-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--dark-title);
  margin-bottom: 8px;
  line-height: 1.5;
}

.news-body p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
}

.news-tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--light-bg);
  color: var(--primary);
  border-radius: 3px;
  font-size: 12px;
  font-weight: 500;
}

/* ===== 联系页面布局 ===== */
.page-content .contact-grid {
  grid-template-columns: 1fr;
  max-width: 720px;
  margin: 0 auto;
}

.contact-info h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark-title);
  margin-bottom: 24px;
}

.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.contact-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--light-bg);
  border-radius: var(--radius);
  font-size: 16px;
  color: var(--primary);
}

.contact-item h5 {
  font-size: 14px;
  font-weight: 600;
  color: var(--dark-title);
  margin-bottom: 2px;
}

.contact-item p {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.6;
}

.contact-extra {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.contact-extra h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark-title);
  margin-bottom: 8px;
}

.contact-extra p {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.7;
}

.contact-form-wrap {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px;
}

.contact-form-wrap h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark-title);
  margin-bottom: 8px;
}

.form-desc {
  font-size: 14px;
  color: var(--text-body);
  margin-bottom: 24px;
  line-height: 1.6;
}

.required {
  color: #E74C3C;
  margin-left: 2px;
}

/* ===== 滚动渐入动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .business-cards,
  .advantage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .solution-detail-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .page-content .contact-grid {
    max-width: 100%;
  }

  .case-meta {
    gap: 16px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: 16px 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    gap: 0;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .hamburger {
    display: flex;
  }

  .banner {
    min-height: 480px;
  }

  .banner-content h1 {
    font-size: 26px;
  }

  .banner-content .subtitle {
    font-size: 16px;
  }

  .page-banner {
    min-height: 240px;
  }

  .page-banner-content h1 {
    font-size: 26px;
  }

  .about-preview {
    grid-template-columns: 1fr;
  }

  .business-cards {
    grid-template-columns: 1fr;
  }

  .solution-list {
    grid-template-columns: 1fr;
  }

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

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

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

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .section {
    padding: 48px 0;
  }

  .section-title h2 {
    font-size: 24px;
  }

  .solution-detail-grid {
    grid-template-columns: 1fr;
  }

  .product-detail-grid {
    grid-template-columns: 1fr;
  }

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

  .product-features {
    grid-template-columns: 1fr;
  }

  .page-content .contact-grid {
    max-width: 100%;
  }

  .contact-form-wrap {
    padding: 24px;
  }

  .news-list .news-item {
    flex-direction: column;
    gap: 12px;
  }

  .news-date {
    min-width: auto;
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 6px 12px;
  }

  .news-date .day {
    font-size: 18px;
  }

  .case-header {
    padding: 20px;
  }

  .case-body {
    padding: 20px;
  }

  .case-meta {
    flex-direction: column;
    gap: 8px;
  }

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

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

  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    flex-direction: row;
    padding-left: 52px;
    padding-right: 0;
    text-align: left;
  }

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

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

@media (max-width: 480px) {
  .banner-content h1 {
    font-size: 22px;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 16px;
  }

  .feature-item {
    flex-direction: column;
    gap: 10px;
  }

  .contact-form-wrap {
    padding: 16px;
  }

  .case-header h3 {
    font-size: 16px;
  }
}