/* roulang page: index */
:root {
      --deep-space: #0B1A2E;
      --star-gold: #D9A066;
      --star-gold-hover: #C58C4D;
      --cold-white: #F5F7FA;
      --graphite: #3A4250;
      --mist: #7B8591;
      --border-light: #DDE1E7;
      --card-shadow: 0 4px 20px rgba(11, 26, 46, 0.06);
      --card-shadow-hover: 0 8px 30px rgba(11, 26, 46, 0.10);
      --gold-light-bg: rgba(217, 160, 102, 0.08);
      --gold-pale-bg: #FBF3E8;
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--cold-white);
      color: var(--graphite);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--star-gold);
      text-decoration: none;
      transition: color 0.25s ease;
    }
    a:hover {
      color: var(--star-gold-hover);
    }

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

    button, .btn {
      font-family: var(--font-sans);
    }

    /* 导航 */
    .navbar {
      background-color: #FFFFFF;
      padding: 0 16px;
      height: 72px;
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      transition: all 0.25s;
    }
    .navbar.sticky-top {
      position: sticky;
      top: 0;
      z-index: 1030;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--deep-space) !important;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: radial-gradient(circle at 30% 30%, #D9A066, #0B1A2E);
      border-radius: 50%;
      box-shadow: 0 0 8px rgba(217,160,102,0.5);
      position: relative;
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      top: 4px;
      left: 10px;
      width: 10px;
      height: 10px;
      background: white;
      border-radius: 50%;
      opacity: 0.7;
      filter: blur(1px);
    }
    .nav-link {
      color: var(--graphite) !important;
      font-weight: 500;
      margin: 0 6px;
      padding: 8px 12px !important;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--star-gold) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--star-gold);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 60%;
    }
    .navbar-toggler {
      border: none;
      color: var(--deep-space);
    }
    .offcanvas {
      background: #FFFFFF;
    }
    .offcanvas .nav-link {
      font-size: 1.1rem;
    }

    @media (max-width: 991.98px) {
      .navbar {
        height: 64px;
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #0B1A2E 0%, #132B44 70%, #1A3A5C 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 100px;
      color: white;
    }
    .stars-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(1px 1px at 20px 40px, rgba(255,255,255,0.4), transparent),
                  radial-gradient(1px 1px at 300px 150px, rgba(255,255,255,0.3), transparent),
                  radial-gradient(2px 2px at 700px 80px, rgba(255,255,255,0.5), transparent),
                  radial-gradient(1px 1px at 900px 200px, rgba(255,255,255,0.25), transparent),
                  radial-gradient(1.5px 1.5px at 400px 350px, rgba(255,255,255,0.35), transparent);
      pointer-events: none;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
      line-height: 1.3;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      max-width: 540px;
      margin-top: 1.2rem;
    }
    .btn-primary-gold {
      background: var(--star-gold);
      border: 2px solid var(--star-gold);
      color: var(--deep-space);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .btn-primary-gold:hover {
      background: var(--star-gold-hover);
      border-color: var(--star-gold-hover);
      color: #0B1A2E;
    }
    .btn-outline-gold {
      background: transparent;
      border: 2px solid var(--star-gold);
      color: var(--star-gold);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s;
    }
    .btn-outline-gold:hover {
      background: rgba(217,160,102,0.1);
      color: #fff;
      border-color: #fff;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: 24px;
      mix-blend-mode: screen;
      opacity: 0.9;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    /* 通用板块 */
    .section-padding {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--deep-space);
      margin-bottom: 0.5rem;
    }
    .section-desc {
      color: var(--mist);
      font-size: 1.05rem;
    }

    /* 功能卡片 */
    .feature-card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--star-gold);
      margin-bottom: 1.2rem;
    }

    /* 场景卡片 */
    .scene-card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.25s;
    }
    .scene-card:hover {
      box-shadow: var(--card-shadow-hover);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    /* 数据徽章 */
    .badge-stat {
      background: linear-gradient(135deg, #FBF3E8, #F5E6D3);
      border-radius: 12px;
      padding: 16px 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--star-gold);
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      color: var(--deep-space);
      background: #fff;
      border-radius: 12px !important;
      box-shadow: none;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      background: #fff;
      color: var(--deep-space);
      border-left: 4px solid var(--star-gold);
      box-shadow: var(--card-shadow);
    }
    .accordion-item {
      border: none;
      margin-bottom: 10px;
      background: transparent;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(120deg, #0B1A2E, #1E3B5A);
      border-radius: 32px;
      padding: 70px 40px;
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(217,160,102,0.15) 0%, transparent 70%);
      top: -40px;
      right: -40px;
    }

    /* Footer */
    .footer {
      background: var(--deep-space);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--star-gold);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.5rem;
      }
      .section-title {
        font-size: 1.9rem;
      }
      .hero-visual {
        min-height: 220px;
        margin-top: 30px;
      }
    }