/* roulang page: index */
:root {
      --primary: #0A1128;
      --accent: #00E5FF;
      --highlight: #FF6B35;
      --neutral-800: #1A2340;
      --neutral-700: #243056;
      --neutral-300: #8E9AAF;
      --neutral-100: #E0E6F0;
      --glass-bg: rgba(26, 35, 64, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --radius-lg: 28px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --shadow-card: 0 20px 35px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.5);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--primary);
      color: var(--neutral-300);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(10, 17, 40, 0.85) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 17, 40, 0.85) 1px, transparent 1px);
      background-size: 60px 60px;
      background-position: center center;
      overflow-x: hidden;
    }

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

    h1, h2, h3 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 3.5rem;
      line-height: 1.15;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5FF 0%, #B2F0FF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.25rem;
    }

    h2 {
      font-size: 2.25rem;
      color: white;
      margin-bottom: 1rem;
      font-weight: 600;
    }

    h3 {
      font-size: 1.4rem;
      color: #E0E6F0;
      font-weight: 500;
    }

    p {
      color: #8E9AAF;
      font-size: 1.05rem;
    }

    a {
      color: var(--accent);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    a:hover {
      color: white;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.25s ease;
      font-weight: 500;
    }

    /* 导航栏 - 毛玻璃效果 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 50;
      background: rgba(10, 17, 40, 0.75);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.2);
      padding: 0.8rem 0;
      transition: background 0.3s;
    }

    .header.scrolled {
      background: rgba(10, 17, 40, 0.9);
      border-bottom: 1px solid var(--accent);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent);
      border-radius: 6px;
      box-shadow: 0 0 12px var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
      font-weight: 500;
      color: #B0C0D0;
    }

    .nav-links a {
      color: #B0C0D0;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 6px;
    }

    .nav-links a:hover {
      color: var(--accent);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }

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

    .nav-right {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .search-box {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 40px;
      padding: 0.4rem 1.2rem;
      display: flex;
      align-items: center;
      color: white;
      gap: 6px;
    }

    .search-box input {
      background: transparent;
      border: none;
      color: white;
      width: 130px;
      outline: none;
      font-size: 0.9rem;
    }

    .search-box input::placeholder {
      color: #8E9AAF;
    }

    .btn-login {
      color: #E0E6F0;
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      padding: 0.5rem 1.4rem;
      border-radius: 30px;
      font-weight: 500;
    }

    .btn-primary-nav {
      background: var(--highlight);
      color: white;
      padding: 0.5rem 1.8rem;
      border-radius: 30px;
      box-shadow: 0 0 15px rgba(255, 107, 53, 0.5);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: transparent;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 30%, rgba(0, 229, 255, 0.12) 0%, transparent 60%);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #B0C0D0;
      margin-bottom: 2rem;
      max-width: 90%;
    }

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

    .btn-primary {
      background: var(--accent);
      color: #0A1128;
      padding: 0.9rem 2.2rem;
      border-radius: 40px;
      font-weight: 700;
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.6);
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0, 229, 255, 0.9);
      background: #33ebff;
    }

    .btn-outline {
      border: 1px solid rgba(255, 255, 255, 0.5);
      color: white;
      padding: 0.9rem 2.2rem;
      border-radius: 40px;
      font-weight: 500;
    }

    .btn-outline:hover {
      border-color: var(--accent);
      box-shadow: inset 0 0 12px rgba(0,229,255,0.3);
    }

    .kpi-board {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .kpi-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .kpi-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--highlight);
      line-height: 1.2;
    }

    /* 优势区 */
    .advantages {
      padding: 100px 0;
    }

    .advantage-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      margin-top: 48px;
      justify-content: center;
    }

    .adv-card {
      background: rgba(26, 35, 64, 0.55);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 28px;
      padding: 38px 32px;
      flex: 1 1 280px;
      transform: translateY(0);
      transition: all 0.3s;
    }

    .adv-card:nth-child(2) {
      margin-top: -20px;
    }

    .adv-card:hover {
      transform: translateY(-8px);
      border-color: var(--accent);
    }

    /* 服务矩阵 */
    .services {
      padding: 90px 0;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.06);
      transition: 0.3s;
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--accent);
    }

    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .service-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(0,229,255,0.2) 0%, rgba(10,17,40,0.7) 100%);
    }

    .service-content {
      padding: 20px 22px 28px;
    }

    .text-link {
      color: var(--accent);
      font-weight: 500;
      margin-top: 12px;
      display: inline-block;
    }

    /* 数据对比 */
    .data-compare {
      padding: 100px 0;
    }

    .compare-panels {
      display: grid;
      grid-template-columns: 1fr 20px 1fr;
      gap: 24px;
      margin-top: 40px;
    }

    .panel-dark {
      background: #2A1A2E;
      border-radius: 20px;
      padding: 32px;
    }

    .panel-light {
      background: #1A2C4A;
      border-radius: 20px;
      padding: 32px;
      border: 1px solid rgba(0,229,255,0.2);
    }

    .divider-glow {
      width: 4px;
      background: linear-gradient(180deg, #FF6B35, #00E5FF);
      border-radius: 4px;
      margin: 0 auto;
    }

    /* FAQ */
    .faq {
      padding: 100px 0;
    }

    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 12px;
    }

    .accordion-btn {
      width: 100%;
      text-align: left;
      padding: 22px 8px;
      display: flex;
      justify-content: space-between;
      font-size: 1.2rem;
      color: white;
      background: transparent;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #8E9AAF;
      padding-left: 12px;
    }

    .accordion-content.open {
      max-height: 150px;
      border-left: 2px solid var(--accent);
    }

    /* 表单 */
    .contact {
      padding: 100px 0;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }

    .trust-badge {
      background: rgba(26,35,64,0.6);
      border-radius: 16px;
      padding: 18px 22px;
      margin-top: 18px;
    }

    .form-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border-radius: 24px;
      padding: 38px;
    }

    .input-glass {
      width: 100%;
      background: rgba(0,0,0,0.35);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 14px 18px;
      color: white;
      margin-bottom: 18px;
      outline: none;
    }

    .input-glass:focus {
      border-color: var(--accent);
      box-shadow: 0 0 12px var(--accent);
    }

    .footer {
      padding: 48px 0 28px;
      text-align: center;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-links, .nav-right { display: none; }
      .hero-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2.5rem; }
      .compare-panels { grid-template-columns: 1fr; }
      .divider-glow { display: none; }
      .contact-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
    }