/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
      --primary: #F04E23;
      --primary-hover: #FF6B3D;
      --accent: #00E5FF;
      --gold: #F5A623;
      --bg-deep: #0B0C10;
      --bg-card: #13151A;
      --text-primary: #FFFFFF;
      --text-secondary: #9CA3AF;
      --border-subtle: rgba(255,255,255,0.06);
      --border-hover: rgba(240,78,35,0.3);
      --shadow-card: 0 4px 24px rgba(240,78,35,0.08);
      --shadow-card-hover: 0 12px 40px rgba(240,78,35,0.2);
      --radius-xl: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --radius-xs: 8px;
    }

    /* ===== 基础重置 ===== */
    *, *::before, *::after {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      margin: 0;
      font-family: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 自定义滚动条 */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: var(--bg-deep); }
    ::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 6px; }

    /* ===== 字体微调 ===== */
    h1, h2, h3, h4 {
      letter-spacing: -0.02em;
    }
    .font-number {
      font-feature-settings: "tnum";
      letter-spacing: -0.03em;
      font-weight: 800;
    }

    /* ===== 导航栏 ===== */
    #mainNav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: rgba(11,12,16,0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(90deg, transparent 0%, rgba(240,78,35,0.3) 50%, transparent 100%);
      background-size: 100% 1px;
      background-position: bottom;
      background-repeat: no-repeat;
      transition: background 0.3s;
    }
    .nav-scrolled {
      background: rgba(11,12,16,0.98) !important;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 800;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      display: inline-block;
      width: 24px;
      height: 24px;
      background: linear-gradient(135deg, var(--primary), var(--gold));
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M13 2L3 14h6l-1 8 10-12h-6l1-8z"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M13 2L3 14h6l-1 8 10-12h-6l1-8z"/></svg>') center/contain no-repeat;
    }
    .nav-links {
      display: flex;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.25s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent);
      border-radius: 2px;
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 8px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-ghost:hover {
      background: rgba(0,229,255,0.1);
      box-shadow: 0 0 16px rgba(0,229,255,0.2);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 8px 20px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      transition: all 0.3s ease;
      box-shadow: 0 4px 12px rgba(240,78,35,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 0 24px rgba(240,78,35,0.6);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links, .nav-right .btn-ghost, .nav-right .btn-primary {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 68px;
        left: 0;
        width: 100%;
        background: rgba(11,12,16,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 24px;
        z-index: 999;
        display: none;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        display: block;
        font-size: 18px;
      }
    }

    /* ===== 板块通用间距 ===== */
    section {
      padding: 80px 0;
    }

    /* ===== Hero 首屏 ===== */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, #1A0F0A 0%, #0B0C10 70%);
      padding-top: 68px;
    }
    .hero-grid {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .hero-left {
      flex: 1;
    }
    .hero-tag {
      color: var(--accent);
      font-size: 12px;
      letter-spacing: 2px;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .hero-title {
      font-size: clamp(40px, 6vw, 56px);
      font-weight: 900;
      line-height: 1.1;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .btn-hero-primary {
      padding: 14px 36px;
      background: var(--primary);
      color: white;
      border-radius: var(--radius-sm);
      font-weight: 700;
      transition: 0.3s;
    }
    .btn-hero-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 24px rgba(240,78,35,0.6);
      transform: scale(1.03);
    }
    .btn-hero-secondary {
      padding: 14px 36px;
      background: transparent;
      border: 1.5px solid white;
      color: white;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-hero-secondary:hover {
      background: rgba(255,255,255,0.1);
      border-color: var(--accent);
    }
    .badge-row {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }
    .badge-capsule {
      background: rgba(255,255,255,0.08);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-secondary);
      border: 1px solid rgba(255,255,255,0.1);
      white-space: nowrap;
    }
    .hero-right {
      flex: 1;
      position: relative;
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-right {
        max-height: 300px;
      }
    }

    /* ===== 实时看板 ===== */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(20,22,28,0.7);
      backdrop-filter: blur(12px);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
      text-align: center;
    }
    .stat-number {
      font-size: 38px;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* ===== 服务矩阵 2x3 ===== */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: rgba(20,22,28,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-xl);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--border-hover);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 16px;
      border-radius: 12px;
      overflow: hidden;
    }
    .service-tags {
      display: flex;
      gap: 8px;
      margin-top: 16px;
      flex-wrap: wrap;
    }
    .tag {
      background: rgba(245,166,35,0.2);
      color: var(--gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ===== 对比区 ===== */
    .compare-container {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .compare-panel {
      flex: 1;
      background: rgba(20,22,28,0.7);
      border-radius: var(--radius-xl);
      padding: 32px;
      border: 1px solid var(--border-subtle);
    }
    .compare-panel.winner {
      border-color: var(--primary);
      box-shadow: 0 0 30px rgba(240,78,35,0.2);
    }
    .vs-badge {
      background: var(--primary);
      color: white;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 12px 0;
    }
    @media (max-width: 768px) {
      .compare-container {
        flex-direction: column;
      }
    }

    /* ===== FAQ ===== */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: rgba(20,22,28,0.7);
      border-radius: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-secondary);
      border-left: 3px solid var(--primary);
      margin-left: 16px;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    @media (max-width: 640px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ===== 终局CTA ===== */
    .cta-section {
      background: linear-gradient(135deg, var(--primary) 0%, #0B0C10 90%);
      text-align: center;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 24px auto;
      gap: 10px;
    }
    .cta-input {
      flex: 1;
      padding: 14px;
      background: rgba(0,0,0,0.3);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-sm);
      color: white;
    }
    .cta-input:focus {
      border-color: var(--accent);
    }

    /* ===== 页脚 ===== */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      padding: 60px 0;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }