/* roulang page: index */
:root {
      --primary-deep: #0A1F3F;
      --primary-dark: #132B4F;
      --accent-gold: #C59B4B;
      --accent-gold-light: rgba(197, 155, 75, 0.18);
      --bg-warm: #F5F3EF;
      --text-main: #1E2B3C;
      --text-muted: #5A6A7E;
      --text-on-dark: #E9EDF2;
      --card-glass-bg: rgba(255, 255, 255, 0.65);
      --card-glass-border: rgba(197, 155, 75, 0.2);
      --shadow-sm: 0 8px 24px rgba(10, 31, 63, 0.06);
      --shadow-md: 0 16px 40px rgba(10, 31, 63, 0.1);
      --shadow-lg: 0 20px 50px rgba(10, 31, 63, 0.15);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-inner: 10px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'Noto Sans SC', sans-serif;
      --container-max: 1280px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-warm);
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
    }

    .site-header.scrolled {
      background: rgba(10, 31, 63, 0.88);
      backdrop-filter: blur(14px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 40px;
      max-width: var(--container-max);
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: white;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      transition: opacity 0.2s;
    }
    .site-header.scrolled .logo {
      color: #f0e9db;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-gold);
      transform: rotate(45deg);
      border-radius: 4px;
      box-shadow: 0 0 14px rgba(197,155,75,0.6);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }

    .nav-links a {
      color: rgba(255,255,255,0.9);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

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

    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 16px;
      letter-spacing: -0.3px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 32px;
      background: var(--accent-gold);
      border-radius: 4px;
    }
    .section-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 48px;
      max-width: 680px;
      font-weight: 300;
    }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: var(--transition-smooth);
      cursor: pointer;
      border: 1.5px solid transparent;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: #0A1F3F;
      border-color: var(--accent-gold);
    }
    .btn-primary:hover {
      background: #d4a84b;
      box-shadow: 0 0 28px rgba(197,155,75,0.55);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
    }
    .btn-outline:hover {
      background: var(--accent-gold);
      color: #0A1F3F;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A1F3F 0%, #132B4F 100%);
      position: relative;
      overflow: hidden;
      padding: 0;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(197,155,75,0.2) 0%, transparent 70%);
      top: -100px;
      right: -50px;
      border-radius: 50%;
    }
    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero h1 {
      font-size: 3.3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      font-weight: 300;
      color: #cdd6e0;
      margin-bottom: 40px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(197,155,75,0.25);
      border: 1px solid rgba(197,155,75,0.4);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10,31,63,0.3) 0%, rgba(10,31,63,0.1) 100%);
    }

    /* 业务矩阵 */
    .business-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .business-row.reverse {
      flex-direction: row-reverse;
    }
    .business-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .business-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    .business-desc {
      flex: 1;
    }
    .business-desc h3 {
      font-size: 1.9rem;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 16px;
    }
    .arrow-link {
      color: var(--accent-gold);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 16px;
    }

    /* 数据仪表盘 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .stat-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-glass-border);
      border-radius: 24px;
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 案例轮播 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 20px;
    }
    .case-card {
      flex: 0 0 340px;
      scroll-snap-align: start;
      border-radius: 24px;
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      position: relative;
    }
    .case-tag {
      position: absolute;
      top: 14px;
      left: 14px;
      background: var(--accent-gold);
      color: #0A1F3F;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 步骤条 */
    .steps-vertical {
      display: flex;
      flex-direction: column;
      gap: 30px;
      position: relative;
    }
    .step-item {
      display: flex;
      gap: 28px;
      align-items: flex-start;
    }
    .step-circle {
      width: 44px;
      height: 44px;
      background: var(--accent-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #0A1F3F;
      flex-shrink: 0;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 220px 1fr;
      gap: 40px;
    }
    .faq-categories {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-cat {
      padding: 12px 18px;
      border-radius: 12px;
      font-weight: 500;
      cursor: pointer;
      transition: 0.2s;
      background: transparent;
    }
    .faq-cat.active {
      background: var(--accent-gold-light);
      color: #0A1F3F;
      font-weight: 600;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A1F3F, #132B4F);
      position: relative;
      text-align: center;
      color: white;
    }
    .cta-light {
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(197,155,75,0.35) 0%, transparent 70%);
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
    .cta-form input {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.25);
      padding: 14px 18px;
      border-radius: 12px;
      color: white;
    }

    footer {
      background: #0A1F3F;
      color: #b0c4d9;
      padding: 70px 0 30px;
    }
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero .container { flex-direction: column; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .stats-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .business-row { flex-direction: column; }
    }