/* roulang page: index */
:root {
      --primary-deep: #1B2A3A;
      --primary-dark: #0F1A24;
      --accent-cyan: #00C2BA;
      --accent-hover: #009F98;
      --bg-warm: #F5F7FA;
      --white: #FFFFFF;
      --border-light: #E9EDF2;
      --text-main: #1B2A3A;
      --text-secondary: #4A5568;
      --text-muted: #A0AEC0;
      --shadow-sm: 0 2px 12px rgba(27,42,58,0.04);
      --shadow-hover: 0 8px 24px rgba(0,194,186,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 80px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    .container {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 20px;
    }

    section {
      padding: var(--spacing-section) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }

    .nav-row-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 20px;
      max-width: 1140px;
      margin: 0 auto;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      letter-spacing: -0.3px;
    }

    .brand-logo i {
      font-size: 2rem;
      color: var(--accent-cyan);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .search-icon {
      color: var(--text-secondary);
      font-size: 1.2rem;
      cursor: default;
      transition: color 0.2s;
    }

    .btn-primary-cyan {
      background-color: var(--accent-cyan);
      border: none;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
    }

    .btn-primary-cyan:hover {
      background-color: var(--accent-hover);
      color: white;
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(0,194,186,0.3);
    }

    .nav-pills-row {
      background: transparent;
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 20px 10px 20px;
      display: flex;
      overflow-x: auto;
      white-space: nowrap;
      gap: 8px;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }

    .nav-pills-row::-webkit-scrollbar {
      display: none;
    }

    .pill-link {
      background: transparent;
      border: 1px solid transparent;
      padding: 6px 18px;
      border-radius: 20px;
      font-weight: 500;
      color: var(--primary-deep);
      transition: all 0.2s ease;
      font-size: 0.95rem;
    }

    .pill-link.active, .pill-link:hover {
      background-color: var(--accent-cyan);
      color: white;
      border-color: var(--accent-cyan);
    }

    @media (max-width: 768px) {
      .brand-logo {
        font-size: 1.25rem;
      }
      .nav-pills-row {
        padding-bottom: 8px;
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #1B2A3A 0%, #0F1A24 100%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      margin-top: 0;
      color: white;
    }

    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(0,194,186,0.08)" d="M0,128L48,144C96,160,192,192,288,181.3C384,171,480,117,576,106.7C672,96,768,128,864,160C960,192,1056,224,1152,213.3C1248,203,1344,149,1392,122.7L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
      background-repeat: no-repeat;
      background-position: bottom;
      background-size: cover;
      opacity: 0.15;
    }

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

    .hero-title {
      font-size: 2.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.3;
    }

    .hero-sub {
      font-size: 1.15rem;
      opacity: 0.9;
      margin: 1.2rem 0 2rem;
    }

    .hero-image-col img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      border: 1px solid rgba(255,255,255,0.1);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
    }

    /* 卡片 */
    .service-card, .case-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: all 0.25s ease;
      box-shadow: var(--shadow-sm);
      height: 100%;
    }

    .service-card:hover, .case-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(0,194,186,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-size: 1.8rem;
      margin-bottom: 1.2rem;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 0.5rem;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* 数据徽章 */
    .stat-badge {
      background: #F0F9F8;
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }

    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent-cyan);
      line-height: 1.2;
    }

    /* 流程 */
    .process-step {
      display: flex;
      align-items: center;
      margin-bottom: 3rem;
    }

    .step-img {
      border-radius: var(--radius-lg);
      width: 100%;
      object-fit: cover;
    }

    .step-number-watermark {
      font-size: 3.5rem;
      font-weight: 200;
      color: rgba(0,194,186,0.15);
      position: absolute;
      top: -15px;
      left: -5px;
      line-height: 1;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--accent-cyan);
      box-shadow: none;
    }

    .accordion-button:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 0.15rem rgba(0,194,186,0.25);
    }

    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #1B2A3A, #0F1A24);
      border-radius: var(--radius-lg);
      padding: 3rem;
      text-align: center;
      color: white;
    }

    .footer-custom {
      background: var(--primary-deep);
      color: #A0AEC0;
      padding: 3rem 0 2rem;
    }

    .footer-custom a:hover {
      color: var(--accent-cyan);
    }

    .btn-outline-light-custom {
      border: 1px solid white;
      color: white;
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: 0.2s;
    }

    .btn-outline-light-custom:hover {
      background: rgba(255,255,255,0.1);
      color: white;
    }