/* roulang page: index */
:root {
      --primary-midnight: #0A0E27;
      --bg-deep: #0F1429;
      --gold: #D4AF37;
      --gold-dark: #B8960F;
      --accent-red: #FF4D4D;
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255,255,255,0.7);
      --text-muted: rgba(255,255,255,0.45);
      --glass-bg: rgba(20, 25, 50, 0.4);
      --glass-border: rgba(212, 175, 55, 0.15);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --gold-glow: 0 0 20px rgba(212,175,55,0.2);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --border-radius-input: 6px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
      --transition-smooth: 0.3s ease;
      --container-max: 1200px;
      --section-padding: 100px;
    }

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

    body {
      font-family: var(--font-title);
      background-color: var(--primary-midnight);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(212,175,55,0.2);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, #D4AF37, #F5E7A7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .nav-chip {
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 500;
      color: rgba(255,255,255,0.75);
      transition: all 0.3s;
      position: relative;
    }

    .nav-chip:hover {
      background: rgba(212,175,55,0.15);
      color: #D4AF37;
    }

    .nav-chip.active {
      color: #D4AF37;
      background: rgba(212,175,55,0.1);
    }

    .nav-cta {
      margin-left: 16px;
      background: linear-gradient(135deg, #D4AF37, #B8960F);
      color: #0A0E27;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 15px;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(212,175,55,0.3);
    }

    .nav-cta:hover {
      box-shadow: 0 0 24px rgba(212,175,55,0.6);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: #D4AF37;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
        width: fit-content;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1A1F3A 0%, #0A0E27 80%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-text h1 .gold-highlight {
      color: #D4AF37;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 40px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #D4AF37, #B8960F);
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      transition: all 0.3s;
      border: none;
      cursor: pointer;
      font-size: 16px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(212,175,55,0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid #D4AF37;
      color: #D4AF37;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      transition: 0.3s;
    }

    .btn-outline:hover {
      background: rgba(212,175,55,0.1);
    }

    .hero-visual {
      flex: 1;
      background: rgba(20,25,50,0.5);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(212,175,55,0.2);
      border-radius: 20px;
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .live-data {
      font-family: var(--font-number);
      font-size: 28px;
      color: #D4AF37;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 36px;
      }
    }

    /* 品牌背书 */
    .partners {
      padding: var(--section-padding) 0;
    }
    .partner-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      filter: grayscale(1);
      opacity: 0.7;
    }
    .partner-item {
      width: 100px;
      height: 40px;
      background: rgba(255,255,255,0.08);
      border-radius: 8px;
    }

    /* 核心服务 非对称 */
    .services {
      padding: var(--section-padding) 0;
    }
    .service-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      padding: 32px;
      transition: all 0.3s;
    }
    .service-card:hover {
      border-color: #D4AF37;
      box-shadow: var(--gold-glow);
    }
    .service-card.large {
      grid-row: span 2;
    }
    .icon-gold {
      font-size: 32px;
      color: #D4AF37;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据优势 */
    .data-stats {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      padding: var(--section-padding) 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item {
      font-family: var(--font-number);
    }
    .stat-number {
      font-size: 48px;
      color: #D4AF37;
    }

    /* 解决方案 */
    .solutions {
      padding: var(--section-padding) 0;
    }
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      background: rgba(255,255,255,0.05);
      border-radius: 12px;
      height: 280px;
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq {
      padding: var(--section-padding) 0;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }

    /* CTA */
    .cta-section {
      background: #0A0E27;
      padding: 100px 0;
      text-align: center;
    }

    /* Footer */
    .footer {
      background: #080B1A;
      padding: 60px 0 30px;
      color: rgba(255,255,255,0.5);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }