/* =====================================================
   众声官网全局样式
   技术栈：HTML5 + CSS3 + ES6+
   设计方向：深绿/青绿，呼应水、生命、声波
   ===================================================== */

/* ---------------- 设计令牌 ---------------- */
:root {
  --primary-dark: #0A2540;
  --primary: #2563EB;
  --primary-light: #60A5FA;
  --accent: #D4A843;
  --bg: #F7F9F8;
  --text: #0F1C1B;
  --text-secondary: #4A5A58;
  --text-muted: #7E8E8C;
  --white: #FFFFFF;
  --card-bg: #FFFFFF;
  --border: rgba(10, 37, 64, 0.08);
  --shadow: 0 8px 30px rgba(10, 37, 64, 0.08);
  --shadow-hover: 0 16px 45px rgba(37, 99, 235, 0.18);

  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  --container: 1200px;
  --header-height: 80px;

  --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

/* ---------------- 字体引入 ---------------- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&family=Noto+Serif+SC:wght@400;600;700&display=swap');

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

.section {
  padding: 100px 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 16px;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 56px;
}

.section-header {
  margin-bottom: 56px;
}

.section-header.center {
  text-align: center;
}

.section-header.center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  background: #1D4ED8;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--primary-dark);
  border: 1.5px solid var(--primary-dark);
}

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

.btn-light {
  background: rgba(255, 255, 255, 0.15);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(6px);
}

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

.btn-sm {
  padding: 10px 22px;
  font-size: 0.85rem;
}

/* ---------------- 导航栏 ---------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: var(--transition);
  background: linear-gradient(to bottom, rgba(10, 37, 64, 0.35), transparent);
}

.header.scrolled {
  background: rgba(10, 37, 64, 0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  height: 72px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
}
.logo-img{
  width:auto;
  height:20px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}

.logo-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--white);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  margin-left: 40px;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-sm);
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--primary-light);
  border-radius: 2px;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
}

.mobile-menu-btn.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

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

/* ---------------- 页脚 ---------------- */
.footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.75);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 64px;
}

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

.footer-brand p {
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 24px;
}

.footer-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 24px;
}

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

.footer-links a {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.footer-contact svg {
  width: 18px;
  height: 18px;
  fill: var(--primary-light);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-subscribe {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.footer-subscribe input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  font-size: 0.9rem;
}

.footer-subscribe input::placeholder {
  color: rgba(255, 255, 255, 0.45);
}

.footer-subscribe button {
  padding: 12px 20px;
  background: var(--primary);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.footer-subscribe button:hover {
  background: var(--primary-light);
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.social-links a:hover {
  background: var(--primary);
}

.social-links svg {
  width: 16px;
  height: 16px;
  fill: var(--white);
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}

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

.back-to-top:hover {
  background: var(--primary-dark);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ---------------- 页面通用横幅 ---------------- */
.page-banner {
  position: relative;
  height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-dark), #071a2b);
  overflow: hidden;
  margin-top: 0;
  padding-top: var(--header-height);
}

.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(111, 227, 195, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(26, 173, 144, 0.1) 0%, transparent 40%);
}

.page-banner-decoration {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  pointer-events: none;
}

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

.page-banner-title {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.page-banner-desc {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
}

.breadcrumb a:hover {
  color: var(--primary-light);
}

.breadcrumb-sep {
  color: rgba(255, 255, 255, 0.35);
}

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

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ---------------- 首页 Hero 轮播 ---------------- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  display: flex;
  align-items: center;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  transition: transform 6s ease;
}

.hero-slide.active .hero-slide-bg {
  transform: scale(1);
}

.hero-slide-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10, 37, 64, 0.88) 0%, rgba(10, 37, 64, 0.5) 55%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  padding-top: var(--header-height);
}

.hero-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--primary-light);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 3.8rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-title span {
  color: var(--primary-light);
}

.hero-desc {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 40px;
  max-width: 560px;
  line-height: 1.8;
}

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

.hero-indicators {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 3;
}

.hero-indicator {
  width: 40px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  cursor: pointer;
  overflow: hidden;
}

.hero-indicator span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--primary-light);
}

.hero-indicator.active span {
  animation: progress 5s linear forwards;
}

@keyframes progress {
  from { width: 0; }
  to { width: 100%; }
}

.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  line-height: 0;
  z-index: 2;
}

.hero-wave svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* ---------------- 首页关于我们 ---------------- */
.about-section {
  background: var(--bg);
  position: relative;
  overflow: hidden;
}

.about-section::before {
  content: "";
  position: absolute;
  right: -10%;
  top: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-images {
  position: relative;
}

.about-main-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  position: relative;
  z-index: 2;
}

.about-main-img img {
  width: 100%;
  height: 480px;
  object-fit: cover;
}

.about-sub-img {
  position: absolute;
  right: -30px;
  bottom: -40px;
  width: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  z-index: 3;
  border: 6px solid var(--bg);
}

.about-sub-img img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.about-badge {
  position: absolute;
  left: -24px;
  top: 48px;
  background: var(--primary);
  color: var(--white);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  z-index: 4;
  box-shadow: var(--shadow);
}

.about-badge-number {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
}

.about-badge-text {
  font-size: 0.85rem;
  margin-top: 6px;
  opacity: 0.9;
}

.about-content h2 {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
  line-height: 1.3;
}

.about-content p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}

.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.about-feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.about-feature-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--primary);
}

.about-feature-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

/* ---------------- 首页产品简介 ---------------- */
.products-section {
  background: var(--white);
}

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

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

.product-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.product-card-img {
  height: 220px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card-img svg {
  width: 90px;
  height: 90px;
  fill: var(--primary);
  opacity: 0.85;
  transition: var(--transition);
}

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

.product-card-body {
  padding: 28px;
}

.product-card-category {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.product-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.product-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.product-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.product-card-tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary-dark);
  border-radius: 20px;
}

/* ---------------- 首页使用案例 ---------------- */
.cases-section {
  background: linear-gradient(180deg, var(--bg) 0%, #eff6ff 100%);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

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

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.case-card-img {
  height: 220px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.case-card-img::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='50' cy='50' r='40' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='0.5'/%3E%3Ccircle cx='50' cy='50' r='28' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='0.5'/%3E%3Ccircle cx='50' cy='50' r='16' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='0.5'/%3E%3C/svg%3E") center/120px no-repeat;
}

.case-card-img svg {
  width: 60px;
  height: 60px;
  fill: var(--white);
  position: relative;
  z-index: 1;
}

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

.case-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.case-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.7;
}

.case-card-result {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.case-card-result-number {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.case-card-result-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------------- 公司简介页 ---------------- */
.brand-section {
  background: var(--white);
}

.brand-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.brand-content h2 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.brand-content p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.brand-standards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.brand-standard {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--primary);
}

.brand-standard-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-standard-icon svg {
  width: 22px;
  height: 22px;
  fill: var(--primary);
}

.brand-standard-text {
  font-weight: 600;
  color: var(--text);
}

.brand-visual {
  position: relative;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  border-radius: var(--radius-lg);
  padding: 48px;
  color: var(--white);
  min-height: 420px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='50' cy='50' r='45' fill='none' stroke='rgba(255,255,255,0.08)' stroke-width='0.8'/%3E%3Ccircle cx='50' cy='50' r='35' fill='none' stroke='rgba(255,255,255,0.08)' stroke-width='0.8'/%3E%3Ccircle cx='50' cy='50' r='25' fill='none' stroke='rgba(255,255,255,0.08)' stroke-width='0.8'/%3E%3Ccircle cx='50' cy='50' r='15' fill='none' stroke='rgba(255,255,255,0.08)' stroke-width='0.8'/%3E%3C/svg%3E") center/300px no-repeat;
}

.brand-visual-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}

.brand-visual-list {
  position: relative;
  z-index: 1;
}

.brand-visual-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.brand-visual-list svg {
  width: 22px;
  height: 22px;
  fill: var(--primary-light);
}

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

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--primary-light));
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 48px 48px 0;
}

.timeline-item:nth-child(even) {
  margin-left: 50%;
  padding: 0 0 48px 48px;
}

.timeline-dot {
  position: absolute;
  right: -8px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px var(--primary);
}

.timeline-item:nth-child(even) .timeline-dot {
  right: auto;
  left: -8px;
}

.timeline-year {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.company-intro-section {
  background: var(--white);
}

.company-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.company-intro-content h2 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.company-intro-content p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.company-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 36px;
}

.company-value {
  padding: 24px;
  background: var(--bg);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.company-value:hover {
  background: var(--primary-dark);
  color: var(--white);
}

.company-value:hover h4 {
  color: var(--primary-light);
}

.company-value:hover p {
  color: rgba(255, 255, 255, 0.75);
}

.company-value h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.company-value p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.company-intro-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}

.company-intro-img img {
  width: 100%;
  height: 460px;
  object-fit: cover;
}

/* ---------------- 产品中心页 ---------------- */
.product-detail-section {
  background: var(--bg);
}

.product-detail-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 48px;
}

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

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

.product-detail-img {
  min-height: 420px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-detail-img svg {
  width: 200px;
  height: 200px;
  fill: var(--primary);
  opacity: 0.85;
}

.product-detail-content {
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-detail-category {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 10px;
}

.product-detail-title {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--primary-dark);
  margin-bottom: 16px;
}

.product-detail-summary {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.8;
}

.product-detail-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.product-detail-tab {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: #eff6ff;
}

.product-detail-tab.active,
.product-detail-tab:hover {
  background: var(--primary);
  color: var(--white);
}

.product-detail-panel {
  display: none;
}

.product-detail-panel.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.product-detail-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.product-detail-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.product-detail-list svg {
  width: 18px;
  height: 18px;
  fill: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.product-detail-cta {
  margin-top: 32px;
}

/* ---------------- 项目合作页 ---------------- */
.cooperation-section {
  background: var(--bg);
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 56px;
  box-shadow: var(--shadow);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-category {
  padding: 4px 12px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  border-radius: 20px;
  font-weight: 600;
}

.article-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--primary-dark);
  margin-bottom: 24px;
  line-height: 1.3;
}

.article-cover {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.article-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

.article-body h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--primary-dark);
  margin: 32px 0 16px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul {
  margin-bottom: 18px;
  padding-left: 20px;
}

.article-body ul li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
}

.article-body ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* ---------------- 新闻动态页 ---------------- */
.news-section {
  background: var(--bg);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.news-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.news-card-img {
  height: 200px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.news-card-img svg {
  width: 64px;
  height: 64px;
  fill: rgba(255, 255, 255, 0.9);
}

.news-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-card-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.news-card-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--primary-dark);
  margin-bottom: 10px;
  line-height: 1.4;
}

.news-card-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}

.news-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

.news-card-link:hover {
  gap: 10px;
}

.news-card-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* ---------------- 联系我们页 ---------------- */
.contact-section {
  background: var(--bg);
}

.contact-grid {
  display: grid;
  /* grid-template-columns: 1fr 1fr;  */
  gap: 48px;
}

.contact-info-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
}

.contact-info-card h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--primary-dark);
  margin-bottom: 28px;
}

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

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

.contact-item-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item-icon svg {
  width: 22px;
  height: 22px;
  fill: var(--primary);
}

.contact-item-content h4 {
  font-size: 1rem;
  color: var(--primary-dark);
  margin-bottom: 4px;
}

.contact-item-content p,
.contact-item-content a {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact-item-content a:hover {
  color: var(--primary);
}

.contact-form {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
}

.contact-form h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--primary-dark);
  margin-bottom: 28px;
}

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

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.contact-channels {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.contact-channel {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.contact-channel:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.contact-channel-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.contact-channel-icon svg {
  width: 28px;
  height: 28px;
  fill: var(--white);
}

.contact-channel h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.contact-channel p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.7;
}

.map-placeholder {
  width: 100%;
  height: 360px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 48px;
  border: 1px dashed var(--primary);
}

.map-placeholder-content {
  text-align: center;
  color: var(--primary-dark);
}

.map-placeholder-content svg {
  width: 64px;
  height: 64px;
  fill: var(--primary);
  margin-bottom: 12px;
}

.map-placeholder-content p {
  font-size: 1rem;
  font-weight: 600;
}

/* ---------------- 文章详情页 ---------------- */
.article-detail-section {
  background: var(--bg);
}

.article-detail-container {
  max-width: 860px;
  margin: 0 auto;
}

.article-detail-header {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.article-detail-cover {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.related-articles {
  margin-top: 48px;
}

.related-articles h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--primary-dark);
  margin-bottom: 24px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  font-size: 0.95rem;
  color: var(--text);
}

.related-list a:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.related-list span {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1200px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 992px) {
  :root {
    --header-height: 72px;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: rgba(11, 61, 61, 0.97);
    backdrop-filter: blur(10px);
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 24px;
    gap: 8px;
    transform: translateX(-100%);
    transition: transform 0.35s ease;
  }

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

  .nav-link {
    font-size: 1.15rem;
    padding: 14px 0;
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0;
  }

  .nav-link:hover,
  .nav-link.active {
    background: none;
  }

  .nav-link.active::after {
    display: none;
  }

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

  .header-cta .btn {
    display: none;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .about-grid,
  .company-intro-grid,
  .contact-grid,
  .brand-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-sub-img {
    right: 0;
    bottom: -20px;
    width: 180px;
  }

  .about-badge {
    left: 0;
  }

  .product-detail-card,
  .product-detail-card:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .product-detail-img {
    min-height: 280px;
  }

  .product-detail-img svg {
    width: 140px;
    height: 140px;
  }

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

  .timeline::before {
    left: 0;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    width: 100%;
    margin-left: 0;
    padding: 0 0 40px 32px;
  }

  .timeline-dot,
  .timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
    right: auto;
  }
}

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

  .section-title {
    font-size: 2rem;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .products-grid,
  .cases-grid,
  .news-grid,
  .about-features,
  .brand-standards,
  .company-values,
  .contact-channels,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .page-banner {
    height: 340px;
  }

  .page-banner-title {
    font-size: 2.2rem;
  }

  .article-container,
  .article-detail-header {
    padding: 32px 24px;
  }

  .article-title {
    font-size: 1.6rem;
  }

  .product-detail-content {
    padding: 32px 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.9rem;
  }

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

  .btn {
    width: 100%;
  }

  .section-title {
    font-size: 1.7rem;
  }
}