/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-glow: #9D4FFF;
      --accent: #00F0FF;
      --accent-soft: rgba(0, 240, 255, 0.15);
      --bg-deep: #0A0A0F;
      --bg-section: #12121A;
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.06);
      --text-white: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #8888A0;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --shadow-glow: 0 0 24px rgba(0, 240, 255, 0.25);
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      backdrop-filter: blur(20px);
      background: rgba(10, 10, 15, 0.85);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      height: 72px;
    }
    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
    }
    .logo-domain {
      font-size: 13px;
      color: var(--text-muted);
      margin-left: 6px;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--accent);
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #0A0A0F;
      border-top: 1px solid rgba(255,255,255,0.08);
      justify-content: space-around;
      padding: 10px 16px;
      z-index: 1000;
      backdrop-filter: blur(12px);
      background: rgba(10,10,15,0.95);
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 12px;
      gap: 4px;
    }
    .mobile-nav-item i {
      font-size: 20px;
    }
    .mobile-nav-item.active {
      color: var(--accent);
    }
    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #9D4FFF);
      color: white;
      border-radius: var(--radius-pill);
      padding: 16px 40px;
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      box-shadow: 0 8px 20px rgba(123,47,247,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 28px rgba(155,80,255,0.5);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      border-radius: var(--radius-pill);
      padding: 16px 40px;
      font-weight: 600;
      background: rgba(0,240,255,0.02);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: var(--shadow-glow);
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at center, rgba(123,47,247,0.25) 0%, #0A0A0F 90%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: 72px;
      font-weight: 800;
      line-height: 1.1;
      background: linear-gradient(to right, #7B2FF7, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      color: #D0D0E0;
      margin-bottom: 48px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .particles {
      position: absolute;
      bottom: 60px;
      left: 0;
      right: 0;
      height: 120px;
      pointer-events: none;
      background: radial-gradient(ellipse at center, rgba(0,240,255,0.2) 0%, transparent 70%);
      opacity: 0.7;
    }
    /* 板块通用 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 42px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 20px;
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 64px;
      font-size: 18px;
    }
    /* 核心优势 四列 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
    }
    .adv-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-glow);
      transform: translateY(-6px);
    }
    .adv-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: white;
      margin-bottom: 12px;
    }
    /* 产品矩阵 三列不对称 */
    .matrix-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    .matrix-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .matrix-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-glow);
    }
    .matrix-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .matrix-content {
      padding: 24px;
      flex:1;
    }
    .tag {
      background: rgba(123,47,247,0.2);
      color: #b590ff;
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* 数据条 */
    .stats-scroll {
      display: flex;
      gap: 48px;
      overflow-x: auto;
      padding: 24px 0;
      justify-content: center;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
      min-width: 160px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }
    /* 解决方案两栏 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-text h2 {
      font-size: 36px;
      color: white;
      margin-bottom: 24px;
    }
    .solution-list {
      list-style: none;
      margin-top: 24px;
    }
    .solution-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .solution-img {
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 0 30px rgba(123,47,247,0.2);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 24px 0;
      font-size: 18px;
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
      background: transparent;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.4s ease;
      color: #B0B0C0;
      font-size: 15px;
      line-height: 1.8;
      padding: 0 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1a0a2e, #0A0A0F);
      text-align: center;
      padding: 100px 24px;
    }
    /* 页脚 */
    footer {
      background: #0A0A0F;
      padding: 80px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .hero h1 { font-size: 48px; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .matrix-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 32px; }
      .advantages-grid { grid-template-columns: 1fr; }
      .matrix-grid { grid-template-columns: 1fr; }
      .solution-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .stats-scroll { gap: 24px; }
    }