/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-deep: #0B3B2F;
      --accent-gold: #C9A962;
      --bg-warm: #F5F4EF;
      --text-dark: #2C2C2C;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --glass-bg: rgba(255, 255, 255, 0.7);
      --glass-border: rgba(255, 255, 255, 0.25);
      --card-shadow: 0 12px 32px rgba(0, 0, 0, 0.06);
      --glass-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
      --radius-card: 20px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --transition: all 0.25s ease;
      --font-heading: 'Playfair Display', 'Noto Sans SC', serif;
      --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: 0.5px;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 墨绿背景区块通用 */
    .section-dark {
      background-color: var(--primary-deep);
      color: var(--white);
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      background: transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep);
      box-shadow: 0 4px 12px rgba(201, 169, 98, 0.35);
    }

    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(201, 169, 98, 0.7);
      transform: translateY(-2px);
    }

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

    .btn-outline:hover {
      background: rgba(201, 169, 98, 0.1);
      box-shadow: 0 0 12px rgba(201, 169, 98, 0.4);
    }

    .btn-light {
      background: var(--white);
      color: var(--primary-deep);
      box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    }

    .btn-light:hover {
      background: var(--accent-gold);
      color: var(--primary-deep);
    }

    /* 导航栏 - 暗色霓虹风格（深墨绿底 + 金线） */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 59, 47, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      z-index: 1000;
      border-bottom: 1px solid rgba(201, 169, 98, 0.25);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 32px;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 1.5rem;
      text-shadow: 0 0 8px rgba(201,169,98,0.7);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      color: #f0f0f0;
      position: relative;
      padding: 6px 0;
      font-size: 0.98rem;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-gold);
      box-shadow: 0 0 10px var(--accent-gold);
      transition: width 0.3s ease;
    }

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

    .nav-link:hover {
      color: var(--accent-gold);
    }

    .nav-cta {
      margin-left: 16px;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--white);
      cursor: pointer;
    }

    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0B3B2F 0%, #0a2e25 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
      padding: 120px 0 80px;
    }

    .hero .container {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1 1 480px;
    }

    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--white);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero-left h1 span {
      color: var(--accent-gold);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
    }

    .hero-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      margin-top: 20px;
    }

    .metric-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(201,169,98,0.35);
      border-radius: 20px;
      padding: 24px 22px;
      text-align: center;
      flex: 1 1 130px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    }

    .metric-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-gold);
      font-family: var(--font-heading);
    }

    .metric-label {
      color: #ddd;
      margin-top: 6px;
      font-size: 0.9rem;
    }

    .hero-right {
      flex: 1 1 400px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }

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

    .section-header h2 {
      font-size: 2.4rem;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }

    .gold-underline {
      width: 70px;
      height: 4px;
      background: var(--accent-gold);
      margin: 16px auto 0;
      border-radius: 4px;
    }

    /* 核心优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 36px;
    }

    .adv-card {
      background: var(--white);
      padding: 36px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      text-align: center;
    }

    .adv-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 36px rgba(0,0,0,0.1);
    }

    .adv-icon {
      font-size: 2.6rem;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    /* 服务矩阵 交错布局 */
    .services-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 32px;
      justify-content: center;
    }

    .service-item {
      flex: 1 1 320px;
      background: var(--white);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }

    .service-item:hover {
      transform: translateY(-6px);
      border-left: 6px solid var(--accent-gold);
    }

    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .service-content {
      padding: 24px;
    }

    /* 结果对比 */
    .compare-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      align-items: center;
      justify-content: center;
    }

    .compare-box {
      background: white;
      border-radius: 24px;
      padding: 32px;
      flex: 1 1 260px;
      text-align: center;
    }

    .traditional {
      color: #6b6b6b;
      background: #f2f2f2;
    }

    .william {
      background: var(--primary-deep);
      color: white;
      border: 2px solid var(--accent-gold);
    }

    .big-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 流程 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 24px;
    }

    .step {
      flex: 1 1 180px;
      text-align: center;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      transition: 0.2s;
    }

    .faq-item.active {
      background: #E8F0ED;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    /* 表单 */
    .contact-form {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(14px);
      border-radius: 28px;
      padding: 36px;
    }

    input, textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 18px;
      border-radius: var(--radius-input);
      border: 1px solid rgba(255,255,255,0.4);
      background: rgba(255,255,255,0.2);
      color: white;
    }

    input:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 12px var(--accent-gold);
    }

    footer {
      background: var(--primary-deep);
      color: #ccc;
      padding: 48px 0;
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        flex-direction: column;
        background: var(--primary-deep);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 24px;
      }
      .nav-menu.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero-left h1 {
        font-size: 2.4rem;
      }
    }