/* ========== 全局重置 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a1a1a;
  --primary-dark: #0d0d0d;
  --primary-light: #333333;
  --accent: #ff6b35;
  --accent-light: #ff8c5a;
  --accent-dark: #e55a25;
  --text: #222222;
  --text-light: #666666;
  --bg: #ffffff;
  --bg-gray: #f2f2f2;
  --bg-dark: #111111;
  --border: #e0e0e0;
  --shadow: 0 4px 20px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.18);
  --radius: 4px;
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
}

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

ul, ol {
  list-style: none;
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 顶部导航 ========== */
.header {
  background: rgba(0,0,0,0.95);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.header.scrolled {
  background: rgba(0,0,0,0.98);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--accent);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -1px;
}

.logo-text h1 {
  font-size: 22px;
  color: #ffffff;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 1px;
}

.logo-text p {
  font-size: 10px;
  color: rgba(255,255,255,0.5);
  letter-spacing: 2px;
  text-transform: uppercase;
}

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

.nav a {
  padding: 10px 20px;
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  font-weight: 600;
  position: relative;
  letter-spacing: 0.5px;
}

.nav a:hover,
.nav a.active {
  color: #ffffff;
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

.header-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #ffffff;
  font-weight: 700;
  font-size: 16px;
}

.header-phone svg {
  width: 20px;
  height: 20px;
  fill: var(--accent);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 28px;
  height: 3px;
  background: #ffffff;
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Banner区域 - 全屏大图冲击 ========== */
.banner {
  margin-top: 80px;
  background: var(--primary-dark);
  color: #fff;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.5) 50%, rgba(0,0,0,0.7) 100%);
  z-index: 1;
}

.banner::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 80%, rgba(255,107,53,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(255,107,53,0.08) 0%, transparent 50%);
  z-index: 1;
}

.banner .container {
  position: relative;
  z-index: 2;
}

.banner-content {
  max-width: 800px;
}

.banner-content h2 {
  font-size: 68px;
  font-weight: 900;
  margin-bottom: 24px;
  line-height: 1.1;
  letter-spacing: -2px;
  text-transform: uppercase;
}

.banner-content h2 span {
  color: var(--accent);
  display: block;
}

.banner-content p {
  font-size: 20px;
  opacity: 0.8;
  margin-bottom: 48px;
  line-height: 1.8;
  max-width: 600px;
  font-weight: 300;
}

.banner-btns {
  display: flex;
  gap: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 40px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255,107,53,0.5);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 3px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
  transform: translateY(-3px);
}

.banner-decoration {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 40%;
  z-index: 1;
  opacity: 0.1;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 40px,
    rgba(255,107,53,0.3) 40px,
    rgba(255,107,53,0.3) 42px
  );
}

/* ========== 通用标题区 ========== */
.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 42px;
  color: var(--primary);
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -1px;
  text-transform: uppercase;
}

.section-title p {
  font-size: 18px;
  color: var(--text-light);
  font-weight: 300;
}

.section-title .line {
  display: inline-block;
  width: 80px;
  height: 5px;
  background: var(--accent);
  border-radius: 0;
  margin-top: 20px;
}

/* ========== 通用区域 ========== */
.section {
  padding: 100px 0;
}

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

/* ========== 服务区域 ========== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 48px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: none;
  border-bottom: 4px solid transparent;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0;
  background: var(--primary);
  transition: var(--transition);
  z-index: 0;
}

.service-card:hover {
  transform: scale(1.06);
  box-shadow: var(--shadow-lg);
  border-bottom-color: var(--accent);
}

.service-card:hover::before {
  height: 100%;
}

.service-card:hover h3,
.service-card:hover p,
.service-card:hover .more {
  color: #fff;
  position: relative;
  z-index: 1;
}

.service-card:hover .service-icon {
  background: var(--accent);
  position: relative;
  z-index: 1;
}

.service-icon {
  width: 80px;
  height: 80px;
  background: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  transition: var(--transition);
}

.service-icon svg {
  width: 40px;
  height: 40px;
  fill: #fff;
}

.service-card h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 14px;
  font-weight: 800;
  position: relative;
  z-index: 1;
  transition: var(--transition);
}

.service-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
  position: relative;
  z-index: 1;
  transition: var(--transition);
}

.service-card .more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  position: relative;
  z-index: 1;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ========== 数据统计区 ========== */
.stats {
  background: var(--primary);
  color: #fff;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.stats::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(135deg, rgba(255,107,53,0.1) 0%, transparent 50%),
    repeating-linear-gradient(90deg, transparent, transparent 100px, rgba(255,255,255,0.02) 100px, rgba(255,255,255,0.02) 101px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.stat-item {
  position: relative;
}

.stat-item::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(255,255,255,0.15);
}

.stat-item:last-child::after {
  display: none;
}

.stat-item h3 {
  font-size: 60px;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 8px;
  line-height: 1;
  letter-spacing: -2px;
}

.stat-item h3 span {
  font-size: 24px;
  font-weight: 400;
}

.stat-item p {
  font-size: 16px;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
  font-size: 14px;
}

/* ========== 关于简介区 ========== */
.about-brief {
  display: flex;
  gap: 80px;
  align-items: center;
}

.about-img {
  flex: 1;
  min-width: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--primary);
  min-height: 450px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: 14px;
  position: relative;
}

.about-img::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--accent);
}

.about-info {
  flex: 1;
  min-width: 0;
}

.about-info h2 {
  font-size: 38px;
  color: var(--primary);
  margin-bottom: 24px;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.2;
}

.about-info p {
  font-size: 16px;
  color: var(--text-light);
  line-height: 2;
  margin-bottom: 16px;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.about-tags span {
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* ========== 案例展示 ========== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  background: var(--bg);
  position: relative;
}

.case-card:hover {
  transform: scale(1.04);
  box-shadow: var(--shadow-lg);
}

.case-img {
  height: 240px;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-size: 14px;
  overflow: hidden;
  position: relative;
}

.case-img::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.6) 100%);
}

.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.case-card:hover .case-img img {
  transform: scale(1.1);
}

.case-info {
  padding: 24px;
}

.case-info h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 10px;
  font-weight: 800;
}

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

.case-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 700;
  margin-top: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ========== 案例筛选 ========== */
.case-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.case-filter button {
  padding: 12px 32px;
  border: 3px solid var(--primary);
  background: transparent;
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.case-filter button:hover,
.case-filter button.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ========== 新闻列表 ========== */
.news-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.news-card {
  background: var(--bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-bottom: 4px solid transparent;
}

.news-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-bottom-color: var(--accent);
}

.news-card .news-img {
  height: 200px;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: rgba(255,255,255,0.4);
  overflow: hidden;
}

.news-card .news-body {
  padding: 24px;
}

.news-card .news-date {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.news-card h3 {
  font-size: 18px;
  color: var(--text);
  margin-bottom: 10px;
  font-weight: 800;
  line-height: 1.5;
}

.news-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========== 新闻详情卡片 ========== */
.news-detail-card {
  display: flex;
  gap: 0;
  background: var(--bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  margin-bottom: 28px;
  border-left: 6px solid transparent;
}

.news-detail-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateX(8px);
  border-left-color: var(--accent);
}

.news-detail-card .news-thumb {
  width: 320px;
  min-height: 220px;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  color: rgba(255,255,255,0.4);
}

.news-detail-card .news-content {
  padding: 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-detail-card .news-date {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 10px;
  font-weight: 700;
  letter-spacing: 1px;
}

.news-detail-card h3 {
  font-size: 20px;
  color: var(--text);
  margin-bottom: 12px;
  font-weight: 800;
  line-height: 1.5;
}

.news-detail-card p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.8;
}

.news-detail-card .read-more,
.read-more {
  margin-top: 16px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  display: inline-block;
}

/* ========== 联系区域 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

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

.contact-item .icon {
  width: 56px;
  height: 56px;
  background: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item .icon svg {
  width: 24px;
  height: 24px;
  fill: var(--accent);
}

.contact-item h4 {
  font-size: 17px;
  color: var(--primary);
  margin-bottom: 4px;
  font-weight: 800;
}

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

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 16px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
  background: var(--bg);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(255,107,53,0.1);
}

.contact-form textarea {
  height: 140px;
  resize: vertical;
}

.contact-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

/* 地图占位 */
.map-placeholder {
  width: 100%;
  height: 400px;
  background: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-size: 14px;
  margin-top: 80px;
}

/* ========== 页面Banner（子页面） ========== */
.page-banner {
  margin-top: 80px;
  background: var(--primary);
  color: #fff;
  padding: 100px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(135deg, rgba(255,107,53,0.15) 0%, transparent 50%),
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 60px,
      rgba(255,255,255,0.02) 60px,
      rgba(255,255,255,0.02) 62px
    );
}

.page-banner h2 {
  font-size: 52px;
  font-weight: 900;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
  letter-spacing: -1px;
  text-transform: uppercase;
}

.page-banner .breadcrumb {
  font-size: 14px;
  opacity: 0.6;
  position: relative;
  z-index: 2;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
}

.page-banner .breadcrumb a {
  color: rgba(255,255,255,0.6);
}

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

/* ========== 服务详情 ========== */
.service-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
  padding-bottom: 80px;
  border-bottom: 4px solid var(--bg-gray);
}

.service-detail:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.service-detail:nth-child(even) {
  direction: rtl;
}

.service-detail:nth-child(even) > * {
  direction: ltr;
}

.service-detail-img {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--primary);
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-size: 14px;
  position: relative;
}

.service-detail-img::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--accent);
}

.service-detail-info h3 {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 20px;
  font-weight: 900;
  letter-spacing: -1px;
}

.service-detail-info p {
  font-size: 16px;
  color: var(--text-light);
  line-height: 2;
  margin-bottom: 16px;
}

.service-detail-info ul {
  margin-top: 20px;
}

.service-detail-info ul li {
  padding: 8px 0;
  font-size: 15px;
  color: var(--text);
  padding-left: 24px;
  position: relative;
  font-weight: 500;
}

.service-detail-info ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 0;
}

/* ========== 优势区域 ========== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  text-align: center;
  padding: 48px 28px;
  background: var(--bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-bottom: 4px solid transparent;
  position: relative;
  overflow: hidden;
}

.advantage-card:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
  border-bottom-color: var(--accent);
}

.advantage-card .num {
  font-size: 72px;
  font-weight: 900;
  color: rgba(26,26,26,0.06);
  margin-bottom: -20px;
  line-height: 1;
}

.advantage-card h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 800;
}

.advantage-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

/* ========== 团队/资质 ========== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.cert-item {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-bottom: 4px solid transparent;
}

.cert-item:hover {
  transform: scale(1.05);
  border-bottom-color: var(--accent);
}

.cert-item .cert-img {
  height: 160px;
  background: var(--primary);
  border-radius: var(--radius);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

.cert-item p {
  font-size: 15px;
  color: var(--text);
  font-weight: 700;
}

/* ========== 时间线 ========== */
.timeline {
  position: relative;
  padding-left: 50px;
  max-width: 750px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--primary);
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -40px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 0;
  background: var(--accent);
  border: 4px solid var(--bg);
  box-shadow: 0 0 0 3px var(--accent);
}

.timeline-item h4 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 8px;
  font-weight: 800;
}

.timeline-item .year {
  font-size: 14px;
  color: var(--accent);
  font-weight: 800;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.timeline-item p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.8;
}

/* ========== 底部 ========== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.8);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
}

.footer-brand h3 {
  font-size: 22px;
  color: #fff;
  margin-bottom: 16px;
  font-weight: 900;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  opacity: 0.5;
}

.footer h4 {
  font-size: 16px;
  color: #fff;
  margin-bottom: 20px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  opacity: 0.5;
  transition: var(--transition);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--accent);
  transform: translateX(4px);
}

.footer-contact p {
  font-size: 14px;
  padding: 4px 0;
  opacity: 0.5;
}

.footer-contact .phone {
  font-size: 22px;
  color: var(--accent);
  font-weight: 900;
  opacity: 1;
}

.footer-bottom {
  margin-top: 48px;
  padding: 24px 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  font-size: 13px;
  opacity: 0.4;
}

/* ========== 回到顶部 ========== */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 52px;
  height: 52px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.back-top.show {
  opacity: 1;
  visibility: visible;
}

.back-top:hover {
  background: var(--accent);
  transform: translateY(-4px);
}

/* ========== 咨询浮窗 ========== */
.float-consult {
  position: fixed;
  right: 28px;
  bottom: 92px;
  z-index: 999;
}

.float-consult a {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  color: #fff;
  padding: 14px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 6px 24px rgba(255,107,53,0.5);
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.float-consult a:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255,107,53,0.6);
  background: var(--accent-light);
}

/* ========== 滚动入场动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
  .stat-item::after {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .cases-grid,
  .news-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .banner-content h2 {
    font-size: 52px;
  }
  .section-title h2 {
    font-size: 34px;
  }
}

@media (max-width: 768px) {
  .header .container {
    height: 64px;
  }

  .nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.98);
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.4);
    gap: 4px;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 14px 16px;
    width: 100%;
    text-align: center;
    color: rgba(255,255,255,0.8);
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .menu-toggle {
    display: flex;
  }

  .header-phone {
    display: none;
  }

  .banner {
    min-height: 80vh;
    margin-top: 64px;
  }

  .banner-content h2 {
    font-size: 36px;
    letter-spacing: -1px;
  }

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

  .banner-decoration {
    display: none;
  }

  .page-banner {
    margin-top: 64px;
    padding: 60px 0 50px;
  }

  .page-banner h2 {
    font-size: 34px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title h2 {
    font-size: 28px;
  }

  .section-title .line {
    width: 60px;
    height: 4px;
  }

  .services-grid,
  .cases-grid,
  .news-list,
  .advantages-grid {
    grid-template-columns: 1fr;
  }

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

  .stat-item h3 {
    font-size: 42px;
  }

  .about-brief {
    flex-direction: column;
    gap: 40px;
  }

  .about-info h2 {
    font-size: 28px;
  }

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

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

  .service-detail {
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 50px;
    padding-bottom: 50px;
  }

  .service-detail:nth-child(even) {
    direction: ltr;
  }

  .service-detail-info h3 {
    font-size: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .banner-btns {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
    padding: 16px 32px;
  }

  .news-detail-card {
    flex-direction: column;
  }

  .news-detail-card .news-thumb {
    width: 100%;
    min-height: 200px;
  }

  .map-placeholder {
    margin-top: 50px;
    height: 300px;
  }
}

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

  .logo-text h1 {
    font-size: 18px;
  }

  .banner-content h2 {
    font-size: 28px;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .stat-item h3 {
    font-size: 36px;
  }

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

  .page-banner h2 {
    font-size: 28px;
  }
}