/* roulang page: index */
:root {
      --deep-space: #0B0E2F;
      --champagne-gold: #C9A96E;
      --champagne-dark: #B8995A;
      --nebula-blue: #4A90D9;
      --warm-bg: #F5F3EF;
      --card-bg: #FFFFFF;
      --deep-footer: #06081C;
      --text-primary: #1A1A2E;
      --text-body: #3A3A4A;
      --text-muted: #6B6B7A;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(11,14,47,0.06);
      --shadow-hover: 0 12px 32px rgba(11,14,47,0.12);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", -apple-system, sans-serif;
      --radius-card: 16px;
      --radius-btn: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      padding-top: 68px;
    }
    h1, h2, h3, h4, .data-number {
      font-family: var(--font-sans);
      color: var(--deep-space);
    }
    .data-number {
      font-family: var(--font-number);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 导航栏 SaaS 命令栏风格 */
    .navbar {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 68px;
      padding: 0 1.5rem;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .navbar-brand {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--deep-space) !important;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }
    .brand-icon {
      color: var(--champagne-gold);
      margin-right: 6px;
      font-size: 1.6rem;
    }
    .nav-link {
      color: #4A4A5A !important;
      font-size: 0.95rem;
      font-weight: 500;
      margin: 0 0.3rem;
      padding: 0.5rem 0.8rem !important;
      border-radius: 6px;
      transition: all 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--deep-space) !important;
      background: rgba(201,169,110,0.08);
    }
    .nav-link.active {
      border-bottom: 2px solid var(--champagne-gold);
    }
    .search-box {
      background: #f2f0ec;
      border: 1px solid transparent;
      border-radius: 20px;
      padding: 0.4rem 1rem;
      font-size: 0.9rem;
      width: 180px;
      transition: all 0.2s;
      color: var(--text-body);
    }
    .search-box:focus {
      outline: none;
      border-color: var(--champagne-gold);
      background: white;
      box-shadow: 0 0 0 3px rgba(201,169,110,0.15);
    }
    .btn-primary-cta {
      background: var(--champagne-gold);
      border: none;
      color: var(--deep-space);
      font-weight: 600;
      padding: 0.5rem 1.4rem;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      transition: all 0.3s;
      white-space: nowrap;
    }
    .btn-primary-cta:hover {
      background: var(--champagne-dark);
      color: #000;
    }
    .btn-outline-dark {
      border: 1px solid var(--deep-space);
      color: var(--deep-space);
      font-weight: 500;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      background: transparent;
      transition: all 0.3s;
    }
    .btn-outline-dark:hover {
      background: var(--deep-space);
      color: white;
    }
    .btn-lg-custom {
      padding: 0.8rem 2.4rem;
      font-size: 1.1rem;
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .navbar-collapse {
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        padding: 1rem;
        border-radius: 0 0 16px 16px;
        margin-top: 8px;
      }
      .search-box {
        width: 100%;
        margin: 0.5rem 0;
      }
    }

    /* Hero 深色渐变 + 星点装饰 */
    .hero-section {
      background: linear-gradient(135deg, #0B0E2F 0%, #1A1D4A 100%);
      padding: 5rem 0 4rem;
      position: relative;
      overflow: hidden;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(201,169,110,0.2) 0%, transparent 70%);
      top: -40px;
      right: -40px;
      border-radius: 50%;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: white;
      line-height: 1.2;
    }
    .hero-sub {
      color: rgba(255,255,255,0.8);
      font-size: 1.2rem;
      margin: 1.2rem 0 2rem;
    }
    .metric-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(6px);
      border-radius: 16px;
      padding: 1.2rem;
      color: white;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .data-number {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: -0.03em;
      color: var(--champagne-gold);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .data-number {
        font-size: 2.5rem;
      }
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.1rem;
    }

    /* 卡片网格 */
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      border: none;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: #F5EDDC;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--nebula-blue);
      font-size: 1.8rem;
      margin-bottom: 1.2rem;
    }
    .learn-more {
      color: var(--champagne-dark);
      font-weight: 500;
      font-size: 0.95rem;
    }

    .timeline-step {
      border-left: 2px solid var(--champagne-gold);
      padding-left: 1.8rem;
      margin-bottom: 2rem;
      position: relative;
    }
    .timeline-step::before {
      content: "";
      width: 10px;
      height: 10px;
      background: var(--champagne-gold);
      border-radius: 50%;
      position: absolute;
      left: -6px;
      top: 4px;
    }

    .faq-accordion .accordion-button {
      font-weight: 600;
      color: var(--deep-space);
      background: #FAF9F7;
      box-shadow: none;
    }
    .faq-accordion .accordion-button:not(.collapsed) {
      background: #FFF;
      color: var(--deep-space);
    }
    .faq-accordion .accordion-button::after {
      color: var(--champagne-gold);
    }

    .cta-dark {
      background: var(--deep-footer);
      border-radius: 24px;
      padding: 3rem;
    }
    .form-control {
      border: 1px solid #E0DED8;
      border-radius: 8px;
      padding: 12px 16px;
      background: white;
    }
    .form-control:focus {
      border-color: var(--champagne-gold);
      box-shadow: 0 0 0 3px rgba(201,169,110,0.2);
    }

    footer {
      background: var(--deep-footer);
      color: #8A8A9A;
    }
    footer a {
      color: #B0B0C0;
    }
    .footer-brand {
      font-size: 1.3rem;
      font-weight: 700;
      color: white;
    }