/* ========================================
   华研电力检修有限公司 - 极简白色风格
   主色: #2d3436 深灰
   中灰: #636e72
   点缀蓝: #0984e3
   ======================================== */

/* ========== 基础重置 ========== */
*, *::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;
  font-weight: 300;
  line-height: 1.8;
  color: #2d3436;
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

a:hover {
  color: #0984e3;
}

ul, ol {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  line-height: 1.4;
}

input, textarea, button, select {
  font-family: inherit;
  font-weight: 300;
}

/* ========== 通用容器 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 区块 ========== */
.section {
  padding: 100px 0;
}

.section-gray {
  background-color: #f9fafb;
}

.section-title {
  text-align: center;
  margin-bottom: 64px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 400;
  color: #2d3436;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.section-title p {
  font-size: 15px;
  color: #636e72;
  font-weight: 300;
  letter-spacing: 1px;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: #0984e3;
  margin: 20px auto 0;
}

/* ========== 头部导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all 0.4s ease;
  border-bottom: 1px solid transparent;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.03);
}

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

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

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #0984e3, #74b9ff);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 400;
  font-size: 16px;
}

.logo-text {
  font-size: 18px;
  font-weight: 400;
  color: #2d3436;
  letter-spacing: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav a {
  font-size: 14px;
  font-weight: 300;
  color: #636e72;
  letter-spacing: 1px;
  position: relative;
  padding: 4px 0;
  transition: color 0.3s ease;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: #0984e3;
  transition: width 0.3s ease;
}

.nav a:hover,
.nav a.active {
  color: #2d3436;
}

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

.header-phone {
  font-size: 14px;
  color: #636e72;
  font-weight: 300;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-phone::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='1.5'%3E%3Cpath d='M22 16.92v3a2 2 0 01-2.18 2 19.79 19.79 0 01-8.63-3.07 19.5 19.5 0 01-6-6 19.79 19.79 0 01-3.07-8.67A2 2 0 014.11 2h3a2 2 0 012 1.72c.127.96.361 1.903.7 2.81a2 2 0 01-.45 2.11L8.09 9.91a16 16 0 006 6l1.27-1.27a2 2 0 012.11-.45c.907.339 1.85.573 2.81.7A2 2 0 0122 16.92z'/%3E%3C/svg%3E") no-repeat center / contain;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: #2d3436;
  transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}

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

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

/* ========== Banner ========== */
.banner {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #f5f6fa 0%, #ffffff 50%, #f0f3f8 100%);
  overflow: hidden;
}

.banner-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
}

.banner-content h1 {
  font-size: 48px;
  font-weight: 300;
  color: #2d3436;
  line-height: 1.3;
  letter-spacing: 3px;
  margin-bottom: 24px;
}

.banner-content h1 strong {
  font-weight: 400;
  color: #0984e3;
}

.banner-content p {
  font-size: 16px;
  color: #636e72;
  line-height: 2;
  margin-bottom: 40px;
  font-weight: 300;
  letter-spacing: 0.5px;
}

.banner-btns {
  display: flex;
  gap: 16px;
}

.banner-decoration {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  opacity: 0.06;
  z-index: 1;
}

.banner-decoration::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border: 1px solid #0984e3;
  border-radius: 50%;
  animation: pulse-ring 4s ease-in-out infinite;
}

.banner-decoration::after {
  content: '';
  position: absolute;
  width: 70%;
  height: 70%;
  top: 15%;
  left: 15%;
  border: 1px solid #2d3436;
  border-radius: 50%;
  animation: pulse-ring 4s ease-in-out 1s infinite;
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.5; }
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  font-size: 14px;
  font-weight: 300;
  letter-spacing: 2px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.4s ease;
  text-transform: uppercase;
}

.btn-primary {
  background: #2d3436;
  color: #ffffff;
}

.btn-primary:hover {
  background: #0984e3;
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(9, 132, 227, 0.15);
}

.btn-outline {
  background: transparent;
  color: #2d3436;
  border: 1px solid rgba(45, 52, 54, 0.2);
}

.btn-outline:hover {
  border-color: #0984e3;
  color: #0984e3;
  transform: translateY(-2px);
}

/* ========== 服务卡片 ========== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.service-card {
  background: #ffffff;
  padding: 48px 32px;
  border-radius: 8px;
  text-align: center;
  transition: all 0.4s ease;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.service-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  background: #f5f6fa;
  transition: all 0.4s ease;
}

.service-card:hover .service-icon {
  background: rgba(9, 132, 227, 0.08);
}

.service-icon svg {
  width: 28px;
  height: 28px;
  stroke: #636e72;
  stroke-width: 1.5;
  fill: none;
  transition: stroke 0.4s ease;
}

.service-card:hover .service-icon svg {
  stroke: #0984e3;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 400;
  color: #2d3436;
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.service-card p {
  font-size: 14px;
  color: #636e72;
  line-height: 1.8;
  font-weight: 300;
}

.service-card .btn {
  margin-top: 24px;
  padding: 10px 24px;
  font-size: 12px;
}

/* ========== 数据统计 ========== */
.stats {
  padding: 80px 0;
  background: #2d3436;
}

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

.stat-item {
  padding: 20px;
}

.stat-number {
  font-size: 48px;
  font-weight: 300;
  color: #ffffff;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.stat-item p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 300;
  letter-spacing: 2px;
}

/* ========== 公司简介 ========== */
.about-brief {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-img {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: #f5f6fa;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 14px;
  letter-spacing: 1px;
}

.about-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-info h3 {
  font-size: 28px;
  font-weight: 300;
  color: #2d3436;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.about-info p {
  font-size: 15px;
  color: #636e72;
  line-height: 2;
  margin-bottom: 24px;
  font-weight: 300;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.about-tags span {
  display: inline-block;
  padding: 8px 20px;
  background: #f5f6fa;
  border-radius: 4px;
  font-size: 13px;
  color: #636e72;
  font-weight: 300;
  letter-spacing: 1px;
  transition: all 0.3s ease;
}

.about-tags span:hover {
  background: rgba(9, 132, 227, 0.06);
  color: #0984e3;
}

/* ========== 案例展示 ========== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.case-card {
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.4s ease;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.case-img {
  position: relative;
  aspect-ratio: 16/10;
  background: #f5f6fa;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 13px;
}

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

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

.case-info {
  padding: 28px;
}

.case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: #f5f6fa;
  border-radius: 3px;
  font-size: 12px;
  color: #636e72;
  font-weight: 300;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.case-info h3 {
  font-size: 16px;
  font-weight: 400;
  color: #2d3436;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.case-info p {
  font-size: 13px;
  color: #b2bec3;
  font-weight: 300;
  line-height: 1.8;
}

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

.case-filter .filter-btn {
  padding: 10px 28px;
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 1px;
  color: #636e72;
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.case-filter .filter-btn:hover,
.case-filter .filter-btn.active {
  color: #0984e3;
  border-color: #0984e3;
  background: rgba(9, 132, 227, 0.04);
}

/* ========== 优势 ========== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.advantage-card {
  padding: 48px 36px;
  text-align: center;
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: 8px;
  transition: all 0.4s ease;
}

.advantage-card:hover {
  border-color: rgba(9, 132, 227, 0.15);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
}

.advantage-card .icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.advantage-card .icon svg {
  width: 32px;
  height: 32px;
  stroke: #0984e3;
  stroke-width: 1.2;
  fill: none;
}

.advantage-card h3 {
  font-size: 17px;
  font-weight: 400;
  color: #2d3436;
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.advantage-card p {
  font-size: 14px;
  color: #636e72;
  line-height: 1.8;
  font-weight: 300;
}

/* ========== 新闻列表 ========== */
.news-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.news-card {
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.4s ease;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.news-img {
  aspect-ratio: 16/9;
  background: #f5f6fa;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 13px;
}

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

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

.news-body {
  padding: 28px;
}

.news-date {
  font-size: 12px;
  color: #b2bec3;
  font-weight: 300;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.news-body h3 {
  font-size: 16px;
  font-weight: 400;
  color: #2d3436;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
  line-height: 1.6;
}

.news-body p {
  font-size: 13px;
  color: #b2bec3;
  font-weight: 300;
  line-height: 1.8;
}

/* 新闻详情卡片样式 */
.news-detail-card {
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
  transition: all 0.4s ease;
  display: flex;
  gap: 0;
  margin-bottom: 30px;
}

.news-detail-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.news-thumb {
  width: 280px;
  min-height: 200px;
  flex-shrink: 0;
  background: #f5f6fa;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 13px;
  overflow: hidden;
}

.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-content {
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-content .news-date {
  margin-bottom: 12px;
}

.news-content h3 {
  font-size: 20px;
  font-weight: 400;
  color: #2d3436;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
  line-height: 1.5;
}

.news-content p {
  font-size: 14px;
  color: #636e72;
  line-height: 1.9;
  font-weight: 300;
  margin-bottom: 20px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #0984e3;
  font-weight: 300;
  letter-spacing: 1px;
  transition: gap 0.3s ease;
}

.read-more:hover {
  gap: 14px;
  color: #0984e3;
}

.read-more::after {
  content: '\2192';
}

/* ========== 页面Banner ========== */
.page-banner {
  padding: 160px 0 80px;
  background: #f9fafb;
  text-align: center;
}

.page-banner h1 {
  font-size: 36px;
  font-weight: 300;
  color: #2d3436;
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.page-banner p {
  font-size: 15px;
  color: #636e72;
  font-weight: 300;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
  font-size: 13px;
  color: #b2bec3;
  font-weight: 300;
}

.breadcrumb a {
  color: #b2bec3;
  transition: color 0.3s ease;
}

.breadcrumb a:hover {
  color: #0984e3;
}

.breadcrumb span {
  color: #636e72;
}

/* ========== 服务详情 ========== */
.service-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

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

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

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

.service-detail-img {
  aspect-ratio: 4/3;
  background: #f5f6fa;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 14px;
}

.service-detail-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.service-detail-info h3 {
  font-size: 24px;
  font-weight: 400;
  color: #2d3436;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.service-detail-info p {
  font-size: 15px;
  color: #636e72;
  line-height: 2;
  font-weight: 300;
  margin-bottom: 16px;
}

.service-detail-info ul {
  margin-bottom: 24px;
}

.service-detail-info ul li {
  font-size: 14px;
  color: #636e72;
  font-weight: 300;
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.service-detail-info ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #0984e3;
  opacity: 0.5;
}

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

.cert-item {
  text-align: center;
  padding: 24px;
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: 8px;
  transition: all 0.3s ease;
}

.cert-item:hover {
  border-color: rgba(9, 132, 227, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.cert-img {
  aspect-ratio: 3/4;
  background: #f5f6fa;
  border-radius: 4px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 12px;
  overflow: hidden;
}

.cert-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cert-item p {
  font-size: 13px;
  color: #636e72;
  font-weight: 300;
}

/* ========== 发展历程 ========== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(0, 0, 0, 0.06);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  padding: 20px 0;
  display: flex;
  align-items: flex-start;
}

.timeline-item:nth-child(odd) {
  justify-content: flex-start;
  padding-right: calc(50% + 40px);
  text-align: right;
}

.timeline-item:nth-child(even) {
  justify-content: flex-end;
  padding-left: calc(50% + 40px);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 28px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid #0984e3;
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-item h4 {
  font-size: 18px;
  font-weight: 400;
  color: #0984e3;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.timeline-item p {
  font-size: 14px;
  color: #636e72;
  font-weight: 300;
  line-height: 1.8;
}

/* ========== 联系 ========== */
.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: 16px;
  align-items: flex-start;
}

.contact-item .icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f5f6fa;
  border-radius: 10px;
}

.contact-item .icon svg {
  width: 20px;
  height: 20px;
  stroke: #0984e3;
  stroke-width: 1.5;
  fill: none;
}

.contact-item h4 {
  font-size: 14px;
  font-weight: 400;
  color: #2d3436;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 14px;
  color: #636e72;
  font-weight: 300;
  line-height: 1.6;
}

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

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 20px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 4px;
  font-size: 14px;
  font-weight: 300;
  color: #2d3436;
  transition: all 0.3s ease;
  background: #ffffff;
  outline: none;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: #b2bec3;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: #0984e3;
  box-shadow: 0 0 0 3px rgba(9, 132, 227, 0.06);
}

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

.contact-form .btn {
  align-self: flex-start;
}

/* 地图占位 */
.map-placeholder {
  width: 100%;
  height: 300px;
  background: #f5f6fa;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2bec3;
  font-size: 14px;
  font-weight: 300;
  letter-spacing: 1px;
  margin-top: 60px;
}

/* ========== 底部 ========== */
.footer {
  background: #2d3436;
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 50px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-brand .logo {
  margin-bottom: 20px;
}

.footer-brand .logo-icon {
  background: rgba(9, 132, 227, 0.3);
}

.footer-brand .logo-text {
  color: #ffffff;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 300;
  line-height: 1.9;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 14px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.footer-links ul li {
  margin-bottom: 12px;
}

.footer-links ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.35);
  font-weight: 300;
  transition: color 0.3s ease;
}

.footer-links ul li a:hover {
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.35);
  font-weight: 300;
  margin-bottom: 10px;
  line-height: 1.6;
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.2);
  font-weight: 300;
  letter-spacing: 0.5px;
}

/* ========== 回到顶部 ========== */
.back-top {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 44px;
  height: 44px;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s ease;
  z-index: 999;
}

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

.back-top:hover {
  background: #2d3436;
  border-color: #2d3436;
}

.back-top svg {
  width: 18px;
  height: 18px;
  stroke: #636e72;
  stroke-width: 1.5;
  fill: none;
  transition: stroke 0.3s ease;
}

.back-top:hover svg {
  stroke: #ffffff;
}

/* ========== 悬浮咨询 ========== */
.float-consult {
  position: fixed;
  right: 30px;
  bottom: 90px;
  z-index: 999;
}

.float-consult a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: #0984e3;
  border-radius: 50%;
  box-shadow: 0 4px 15px rgba(9, 132, 227, 0.25);
  transition: all 0.3s ease;
}

.float-consult a:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(9, 132, 227, 0.35);
}

.float-consult svg {
  width: 20px;
  height: 20px;
  stroke: #ffffff;
  stroke-width: 1.5;
  fill: none;
}

/* ========== 入场动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  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);
  }

  .about-brief {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

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

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

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

  .news-thumb {
    width: 100%;
    min-height: 180px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 70px 0;
  }

  .section-title {
    margin-bottom: 44px;
  }

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

  .header .container {
    height: 64px;
  }

  .nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  }

  .nav.open {
    display: flex;
  }

  .header-phone {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .banner {
    min-height: 500px;
    height: auto;
    padding: 120px 0 80px;
  }

  .banner-content h1 {
    font-size: 30px;
  }

  .banner-content p {
    font-size: 14px;
  }

  .banner-btns {
    flex-direction: column;
    gap: 12px;
  }

  .banner-decoration {
    display: none;
  }

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

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

  .stat-number {
    font-size: 36px;
  }

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

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

  .page-banner {
    padding: 120px 0 60px;
  }

  .page-banner h1 {
    font-size: 28px;
  }

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

  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    padding-left: 56px;
    padding-right: 0;
    text-align: left;
    justify-content: flex-start;
  }

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

  .case-filter {
    gap: 8px;
  }

  .case-filter .filter-btn {
    padding: 8px 18px;
    font-size: 12px;
  }

  .logo-text {
    font-size: 15px;
  }
}

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

  .section {
    padding: 56px 0;
  }

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

  .stat-number {
    font-size: 30px;
  }

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

  .btn {
    padding: 12px 28px;
    font-size: 13px;
  }
}