/* roulang page: index */
:root {
      --bg-deep: #0A0E1A;
      --cyan-electric: #00E5FF;
      --orange-sport: #FF6B35;
      --text-primary: #E0E6F0;
      --text-secondary: #8899B4;
      --card-bg: rgba(15, 25, 45, 0.65);
      --card-border: rgba(0, 229, 255, 0.18);
      --card-hover-border: rgba(0, 229, 255, 0.5);
      --glass-blur: blur(12px);
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 8px;
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.35);
      --transition-smooth: 0.3s cubic-bezier(0.2, 0.0, 0, 1.0);
      --font-title: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "DIN Alternate", "Roboto Mono", "Courier New", monospace;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      background-image: radial-gradient(circle at 30% 20%, rgba(0, 229, 255, 0.08) 0%, transparent 45%),
                        linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px);
      background-size: 100% 100%, 40px 40px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    button, input {
      font-family: inherit;
      outline: none;
    }

    /* 导航系统 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      height: 72px;
      background: rgba(10, 14, 26, 0.82);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav-container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #00E5FF, #0088CC);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan-electric);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-electric);
      transition: width 0.25s ease;
      box-shadow: 0 0 10px var(--cyan-electric);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-ghost-sm {
      background: transparent;
      border: 1px solid rgba(0, 229, 255, 0.5);
      color: var(--cyan-electric);
      padding: 10px 20px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: all 0.25s;
      backdrop-filter: blur(8px);
      white-space: nowrap;
    }

    .btn-ghost-sm:hover {
      background: rgba(0, 229, 255, 0.12);
      border-color: var(--cyan-electric);
      box-shadow: 0 0 15px rgba(0, 229, 255, 0.3);
    }

    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 767px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        height: 68px;
        background: rgba(10, 14, 26, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0, 229, 255, 0.18);
        justify-content: space-around;
        align-items: center;
        padding: 0 8px;
      }
      .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--text-secondary);
        font-size: 0.7rem;
        gap: 4px;
        transition: 0.2s;
        cursor: pointer;
      }
      .mobile-nav-item.active {
        color: var(--cyan-electric);
      }
      .mobile-nav-item i {
        font-size: 1.3rem;
      }
      .mobile-cta-btn {
        background: var(--orange-sport);
        color: white;
        border-radius: 40px;
        padding: 8px 18px;
        font-weight: 600;
        margin-bottom: 6px;
        box-shadow: 0 4px 14px rgba(255, 107, 53, 0.5);
        display: flex;
        align-items: center;
        gap: 4px;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 767px) {
      section {
        padding: 70px 0;
      }
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
      color: white;
    }
    h3 {
      font-size: 1.3rem;
      font-weight: 600;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 1rem;
      margin-bottom: 48px;
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      min-height: 90vh;
      padding-top: 90px;
    }
    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-left .highlight {
      color: var(--cyan-electric);
      text-shadow: 0 0 20px rgba(0,229,255,0.7);
    }
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 24px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #0088CC);
      border: none;
      color: #0A0E1A;
      font-weight: 700;
      padding: 16px 36px;
      border-radius: 50px;
      cursor: pointer;
      box-shadow: 0 0 25px rgba(0,229,255,0.5);
      transition: 0.3s;
      font-size: 1rem;
    }
    .btn-primary:hover {
      box-shadow: 0 0 45px rgba(0,229,255,0.8);
      transform: scale(1.03);
    }
    .link-underline {
      color: var(--orange-sport);
      font-weight: 600;
      border-bottom: 2px solid transparent;
      transition: 0.3s;
      cursor: pointer;
    }
    .link-underline:hover {
      border-bottom-color: var(--orange-sport);
    }

    .data-panel {
      display: flex;
      flex-direction: column;
      gap: 20px;
      background: rgba(15,25,45,0.55);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 28px;
      border: 1px solid rgba(0,229,255,0.25);
      animation: softGlow 4s infinite alternate;
    }
    @keyframes softGlow {
      0% { box-shadow: 0 0 12px rgba(0,229,255,0.2); }
      100% { box-shadow: 0 0 28px rgba(0,229,255,0.5); }
    }
    .metric-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.3rem;
      font-weight: 700;
      color: var(--cyan-electric);
    }
    .metric-orange {
      color: var(--orange-sport);
    }

    @media (max-width: 767px) {
      .hero-grid {
        grid-template-columns: 1fr;
        padding-top: 50px;
        gap: 32px;
      }
      .hero-left h1 {
        font-size: 2.3rem;
      }
    }

    /* 卡片通用 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      transition: var(--transition-smooth);
      padding: 28px;
    }
    .glass-card:hover {
      border-color: var(--card-hover-border);
      transform: translateY(-6px);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    @media (max-width: 1023px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .features-grid { grid-template-columns: 1fr; }
    }

    .service-matrix {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    @media (max-width: 1023px) {
      .service-matrix { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .service-matrix { grid-template-columns: 1fr; }
    }

    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 60px 1fr;
      align-items: center;
    }
    .vs-indicator {
      font-weight: 700;
      color: var(--orange-sport);
      font-size: 1.4rem;
      text-align: center;
    }
    @media (max-width: 767px) {
      .compare-wrapper {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      .vs-indicator {
        transform: rotate(90deg);
      }
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    @media (max-width: 767px) {
      .faq-grid { grid-template-columns: 1fr; }
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1023px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    input[type="text"] {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(0,229,255,0.25);
      border-radius: 50px;
      padding: 14px 20px;
      color: white;
      width: 100%;
    }