/* roulang page: index */
:root {
      --deep-ocean: #0B1D3A;
      --aurora-cyan: #00F0FF;
      --ice-white: #E6F7FF;
      --bg-start: #020B1A;
      --bg-mid: #0B1D3A;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(0, 240, 255, 0.15);
      --card-shadow: 0 8px 32px rgba(0, 240, 255, 0.08);
      --btn-glow: 0 0 20px rgba(0, 240, 255, 0.5);
      --transition: 0.3s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background: linear-gradient(135deg, var(--bg-start) 0%, var(--deep-ocean) 100%);
      color: rgba(255, 255, 255, 0.85);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      z-index: 1000;
      transition: background var(--transition), backdrop-filter var(--transition);
      display: flex;
      align-items: center;
    }
    .header.scrolled {
      background: rgba(11, 29, 58, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }
    .header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--ice-white);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo svg {
      width: 32px;
      height: 32px;
      fill: var(--aurora-cyan);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      color: var(--ice-white);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--aurora-cyan);
      box-shadow: 0 0 8px var(--aurora-cyan);
      transition: width var(--transition);
    }
    .nav-menu a:hover {
      color: var(--aurora-cyan);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--ice-white);
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(2, 11, 26, 0.75);
      backdrop-filter: blur(2px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.5rem, 6vw, 3.8rem);
      font-weight: 700;
      background: linear-gradient(to right, #fff, var(--aurora-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 14px 32px;
      font-weight: 600;
      border-radius: 50px;
      font-size: 1rem;
      transition: all var(--transition);
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00c8ff, var(--aurora-cyan));
      color: var(--deep-ocean);
      box-shadow: var(--btn-glow);
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.8);
      transform: translateY(-3px);
    }
    .btn-outline {
      border: 1.5px solid var(--aurora-cyan);
      color: var(--aurora-cyan);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      transform: translateY(-3px);
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--ice-white);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: rgba(255,255,255,0.7);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
    }
    /* 玻璃卡片混搭 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
    }
    .glass-card:hover {
      border-color: rgba(0,240,255,0.4);
      background: rgba(255,255,255,0.08);
    }
    /* 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .feature-item {
      padding: 32px 24px;
    }
    .feature-item.large {
      grid-row: span 1;
    }
    .icon-wrap {
      width: 48px;
      height: 48px;
      background: rgba(0,240,255,0.15);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--aurora-cyan);
    }
    /* 杂志分栏 */
    .service-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--glass-border);
    }
    .service-text {
      flex: 1;
    }
    /* 瀑布流案例 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      overflow: hidden;
      transition: transform var(--transition);
    }
    .case-card:hover {
      transform: translateY(-6px);
    }
    .case-card img {
      border-radius: 16px 16px 0 0;
      transition: transform 0.4s;
    }
    .case-card:hover img {
      transform: scale(1.02);
    }
    /* 对比 */
    .compare-panel {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      padding: 32px;
    }
    .compare-col.highlight {
      border: 2px solid var(--aurora-cyan);
      background: rgba(0,240,255,0.08);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.2);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--ice-white);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: rgba(255,255,255,0.7);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr 1fr; }
      .masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(11,29,58,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
      }
      .nav-menu.active { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .masonry { columns: 1; }
      .compare-panel { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }