/* roulang page: index */
:root {
      --primary-deep: #1E2D2F;
      --accent-gold: #C9A96E;
      --bg-warm: #FAF8F5;
      --emerald-dark: #2F4F4F;
      --text-primary: #1E2D2F;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --white: #FFFFFF;
      --bg-light-emerald: #F0F4F3;
      --border-soft: #E0DCD5;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
      --shadow-nav: 0 1px 8px rgba(0, 0, 0, 0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 300;
    }
    h1, h2, h3 {
      font-family: 'Noto Serif SC', 'Noto Sans SC', serif;
      color: var(--text-primary);
      font-weight: 700;
      line-height: 1.3;
    }
    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
      letter-spacing: 0.5px;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    a {
      text-decoration: none;
      color: var(--accent-gold);
      transition: color 0.2s;
      position: relative;
    }
    a:hover {
      color: var(--emerald-dark);
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s;
      background-color: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
    }
    .header-shadow {
      box-shadow: var(--shadow-nav);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: 'Noto Serif SC', serif;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-primary);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.3rem 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-links a:hover {
      border-bottom-color: var(--accent-gold);
      color: var(--emerald-dark);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 100%;
      height: 100vh;
      background: var(--bg-warm);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      transition: right 0.4s ease;
      z-index: 999;
      list-style: none;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--text-primary);
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 2rem;
      cursor: pointer;
      color: var(--text-primary);
    }
    /* 按钮 */
    .btn-primary {
      background: var(--emerald-dark);
      color: var(--bg-warm);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: background 0.3s, transform 0.2s;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #1E2D2F;
      transform: scale(1.02);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(47,79,79,0.1);
      border-color: var(--emerald-dark);
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      background: linear-gradient(90deg, rgba(30,45,47,0.05) 0%, rgba(250,248,245,0) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      width: 55%;
      z-index: 2;
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-body);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-visual {
      width: 45%;
      height: 420px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(30,45,47,0.7) 10%, rgba(30,45,47,0.2) 100%);
    }
    .geometric-lines {
      position: absolute;
      right: 5%;
      top: 20%;
      width: 300px;
      height: 300px;
      border: 1px solid rgba(201,169,110,0.25);
      border-radius: 40% 60% 30% 70%;
      animation: morph 20s ease-in-out infinite;
    }
    @keyframes morph {
      0% { border-radius: 40% 60% 30% 70%; transform: rotate(0deg); }
      50% { border-radius: 60% 40% 70% 30%; transform: rotate(10deg); }
      100% { border-radius: 40% 60% 30% 70%; transform: rotate(0deg); }
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-intro {
      max-width: 700px;
      margin-bottom: 3rem;
    }
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .adv-item {
      display: flex;
      gap: 1.5rem;
      background: var(--white);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      align-items: flex-start;
      transition: var(--transition);
    }
    .adv-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .adv-icon {
      width: 48px;
      height: 48px;
      color: var(--emerald-dark);
      font-size: 2.5rem;
      display: flex;
      align-items: center;
    }
    /* 业务版图 */
    .biz-grid {
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }
    .biz-row {
      display: flex;
      gap: 2rem;
      align-items: stretch;
    }
    .biz-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .biz-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .biz-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s;
    }
    .biz-card:hover .biz-img {
      transform: scale(1.03);
    }
    .biz-text {
      padding: 1.8rem;
    }
    .large-card { width: 66%; }
    .small-card { width: 34%; }
    /* 关键数据 */
    .data-panel {
      background: var(--bg-light-emerald);
      padding: 60px 0;
    }
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    /* 解决方案路径 */
    .timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 3rem;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 5%;
      width: 90%;
      border-top: 2px dashed var(--accent-gold);
    }
    .step {
      text-align: center;
      width: 22%;
      z-index: 2;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      border: 2px solid var(--emerald-dark);
      border-radius: 50%;
      margin: 0 auto 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      background: var(--bg-warm);
      transition: 0.3s;
    }
    .step:hover .step-circle {
      background: var(--emerald-dark);
      color: white;
    }
    /* 案例 */
    .cases-grid {
      display: flex;
      gap: 2rem;
    }
    .case-card {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .case-img {
      height: 240px;
      background-size: cover;
    }
    .case-tag {
      background: rgba(201,169,110,0.15);
      color: var(--accent-gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border: 1px solid var(--border-soft);
      border-radius: 8px;
      margin-bottom: 1rem;
    }
    .faq-question {
      padding: 1.5rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 1.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    /* CTA尾屏 */
    .cta-dark {
      background: var(--primary-deep);
      text-align: center;
      padding: 100px 0;
      color: var(--bg-warm);
    }
    .footer {
      background: #151D1E;
      color: #8C8C8C;
      padding: 40px 0 20px;
    }
    @media (max-width: 1024px) {
      .hero { flex-direction: column; }
      .hero-content, .hero-visual { width: 100%; }
      .hero h1 { font-size: 2.5rem; }
      .biz-row { flex-direction: column; }
      .large-card, .small-card { width: 100%; }
      .cases-grid { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .advantages-grid { grid-template-columns: 1fr; }
      .timeline { flex-direction: column; gap: 2rem; }
      .timeline::before { display: none; }
      .step { width: 100%; display: flex; gap: 1rem; align-items: center; }
    }