/* roulang page: index */
:root {
      --bg-primary: #0A0E17;
      --gold: #C9A84C;
      --cyan: #00F0FF;
      --card-bg: #1A1F2B;
      --text-secondary: #B0B8C1;
      --border: #2A2F3D;
      --white: #FFFFFF;
      --deep-dark: #060A10;
      --red: #FF4D6A;
      --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    }

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

    body {
      background-color: var(--bg-primary);
      color: var(--text-secondary);
      font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, .h1, .h2, .h3 {
      color: var(--white);
      font-weight: 700;
    }

    h1 {
      font-size: 56px;
      line-height: 1.1;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }

    h2 {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.01em;
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
    }

    h2::before {
      content: '';
      width: 4px;
      height: 32px;
      background: var(--gold);
      border-radius: 2px;
      flex-shrink: 0;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
    }

    p {
      color: var(--text-secondary);
      line-height: 1.8;
    }

    a {
      color: var(--cyan);
      text-decoration: none;
      transition: color 0.25s, text-decoration 0.25s;
    }

    a:hover {
      text-decoration: underline;
      color: #66f5ff;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
      border: none;
      background: transparent;
      font-weight: 600;
      letter-spacing: 0.05em;
      font-size: 15px;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-primary {
      background: var(--gold);
      color: #0A0E17;
      padding: 14px 32px;
      font-weight: 600;
    }

    .btn-primary:hover {
      background: #D4B65F;
      box-shadow: 0 0 20px rgba(201,168,76,0.4);
      transform: translateY(-1px);
      text-decoration: none;
    }

    .btn-outline {
      border: 1px solid var(--gold);
      color: var(--gold);
      padding: 14px 32px;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(201,168,76,0.08);
      box-shadow: 0 0 12px rgba(201,168,76,0.2);
      text-decoration: none;
    }

    .text-link {
      color: var(--cyan);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .text-link:hover {
      text-decoration: underline;
      color: #80f7ff;
    }

    .badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 13px;
      border-radius: 20px;
      font-weight: 500;
      letter-spacing: 0.3px;
    }

    .badge-cyan {
      color: var(--cyan);
      border: 1px solid rgba(0,240,255,0.4);
      background: rgba(0,240,255,0.05);
    }

    .badge-gold {
      color: var(--gold);
      background: rgba(201,168,76,0.1);
      border: 1px solid rgba(201,168,76,0.3);
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10,14,23,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      z-index: 100;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .header.scrolled {
      background: rgba(10,14,23,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--gold);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--white);
      text-decoration: none;
    }

    .mobile-menu-btn {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      padding: 4px;
    }

    .mobile-menu-btn span {
      width: 24px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
    }

    /* 移动端菜单 */
    .mobile-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #0A0E17;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      z-index: 99;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s;
    }

    .mobile-nav.active {
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-nav a {
      font-size: 22px;
      color: white;
    }

    section {
      padding: 120px 0;
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease-out, transform 0.7s ease-out;
    }

    section.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 1023px) {
      h1 { font-size: 40px; }
      h2 { font-size: 32px; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: flex; }
    }

    @media (max-width: 767px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      section { padding: 80px 0; }
      .container { padding: 0 16px; }
    }

    /* Hero区域 */
    .hero-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 40px;
      align-items: center;
      min-height: 90vh;
      padding-top: 100px;
    }

    .hero-visual {
      position: relative;
      background: #0A0E17;
      border-radius: 24px;
      overflow: hidden;
      min-height: 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }

    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,14,23,0.75);
    }

    .data-svg-overlay {
      position: absolute;
      top: 40%;
      left: 20%;
      color: var(--cyan);
      font-size: 36px;
      font-weight: 800;
      z-index: 2;
      font-family: var(--font-mono);
      display: flex;
      gap: 12px;
    }

    @media (max-width: 768px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { min-height: 280px; }
    }

    /* 卡片与组件 */
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 32px;
      transition: transform 0.3s, box-shadow 0.3s, border-color 0.2s;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: var(--gold);
      box-shadow: 0 8px 24px rgba(0,240,255,0.06);
    }

    .metric-card {
      background: var(--card-bg);
      border-top: 2px solid var(--cyan);
      border-radius: 12px;
      padding: 28px 24px;
    }

    .metric-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--cyan);
      font-family: var(--font-mono);
      font-feature-settings: "tnum";
    }

    .compare-card {
      background: #161B24;
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 32px;
    }

    .compare-card.recommended {
      background: #1A1F2B;
      border-color: var(--gold);
      position: relative;
    }

    .faq-item {
      background: var(--card-bg);
      margin-bottom: 12px;
      border-radius: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      background: #161B24;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }

    input, textarea {
      background: #1A1F2B;
      border: 1px solid var(--border);
      color: white;
      border-radius: 8px;
      padding: 14px;
      width: 100%;
      transition: 0.2s;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--cyan);
      box-shadow: 0 0 0 3px rgba(0,240,255,0.15);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
    }

    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }