/* roulang page: index */
:root {
      --bg-deep: #0B0E14;
      --cyan-bright: #00F0FF;
      --orange-burst: #FF4D2E;
      --card-bg: #1A1E26;
      --text-secondary: #8A8F98;
      --text-light: #E4E7EB;
      --border-subtle: rgba(0, 240, 255, 0.15);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 240, 255, 0.08);
      --shadow-glow: 0 0 24px rgba(255, 77, 46, 0.6);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-mono: 'Inter', 'DIN Alternate', 'Roboto Mono', sans-serif;
    }

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

    body {
      background-color: var(--bg-deep);
      color: #B0B8C1;
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid var(--border-subtle);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
    }
    .logo .cyan {
      color: var(--cyan-bright);
      font-family: var(--font-mono);
      font-weight: 700;
      margin-right: 2px;
    }
    .logo .white {
      color: white;
      font-weight: 600;
    }

    .nav-menu {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-menu a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--cyan-bright);
    }
    .nav-cta {
      border: 1px solid var(--orange-burst);
      color: var(--orange-burst);
      padding: 0.5rem 1.2rem;
      border-radius: 2rem;
      font-weight: 600;
      transition: all 0.25s;
      background: transparent;
    }
    .nav-cta:hover {
      background: var(--orange-burst);
      color: white;
      box-shadow: var(--shadow-glow);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--cyan-bright);
      transition: 0.2s;
    }

    /* 英雄区 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      width: 100%;
    }
    .hero-title {
      font-size: clamp(2.8rem, 7vw, 5rem);
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: white;
    }
    .hero-title .cyan {
      color: var(--cyan-bright);
    }
    .hero-title .orange {
      color: var(--orange-burst);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin: 1.5rem 0 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-ghost {
      border: 1px solid var(--cyan-bright);
      color: var(--cyan-bright);
      padding: 0.8rem 2rem;
      border-radius: 2.5rem;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 16px rgba(0,240,255,0.4);
    }
    .btn-primary {
      background: var(--orange-burst);
      color: white;
      padding: 0.8rem 2.2rem;
      border-radius: 2.5rem;
      font-weight: 700;
      box-shadow: var(--shadow-glow);
      transition: 0.25s;
    }
    .btn-primary:hover {
      background: #ff6640;
      box-shadow: 0 0 32px rgba(255,77,46,0.8);
      transform: translateY(-2px);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 450px;
      box-shadow: 0 0 30px rgba(0,240,255,0.25);
      position: relative;
      overflow: hidden;
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 2.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 36px;
      background: var(--cyan-bright);
      border-radius: 3px;
    }

    /* 服务卡片 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 1.8rem;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-subtle);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-5px);
      border-color: var(--cyan-bright);
      box-shadow: 0 16px 40px rgba(0,240,255,0.2);
    }
    .service-large img {
      border-radius: 12px;
      margin-bottom: 1.5rem;
    }
    .small-stack {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    .service-small {
      flex-direction: row;
      align-items: center;
      gap: 1rem;
      padding: 1.5rem;
    }
    .service-small .cyan-bar {
      width: 4px;
      height: 40px;
      background: var(--cyan-bright);
      border-radius: 2px;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--cyan-bright);
      text-shadow: 0 0 20px rgba(0,240,255,0.5);
    }

    /* 走马灯案例 */
    .carousel {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 320px;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      scroll-snap-align: start;
    }
    .case-card img {
      height: 180px;
      object-fit: cover;
    }
    .case-info {
      padding: 1rem;
    }

    /* 时间轴 */
    .timeline {
      position: relative;
    }
    .timeline-step {
      display: flex;
      gap: 2rem;
      margin-bottom: 2.5rem;
    }
    .step-node {
      width: 16px;
      height: 16px;
      background: var(--orange-burst);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--orange-burst);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 200px 1fr;
      gap: 2rem;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 1rem 0;
    }

    /* CTA */
    .cta-section {
      background: #0B0E14 url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      padding: 5rem 0;
      text-align: center;
    }

    footer {
      background: #0A0C12;
      padding: 3rem 0 1.5rem;
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .faq-grid { grid-template-columns: 1fr; }
    }