/* roulang page: index */
:root {
      --deep-black: #0B0C10;
      --milan-purple: #C0A0FF;
      --esport-cyan: #00F0FF;
      --rose-gold: #FFB6C1;
      --glass-bg: rgba(11, 12, 16, 0.7);
      --glass-border: rgba(192, 160, 255, 0.25);
      --glass-shadow: 0 8px 32px rgba(0, 240, 255, 0.08);
      --text-light: rgba(255, 255, 255, 0.9);
      --text-muted: rgba(255, 255, 255, 0.65);
      --radius: 16px;
      --transition: all 0.25s ease;
      --font-heading: 'Segoe UI', '思源黑体', '阿里妈妈数黑体', 'Helvetica Neue', sans-serif;
      --font-body: 'Segoe UI', '思源黑体', system-ui, -apple-system, sans-serif;
    }

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

    body {
      background: var(--deep-black);
      color: var(--text-light);
      font-family: var(--font-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 30% 20%, #1a1025 0%, #0B0C10 70%);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 沉浸式导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11, 12, 16, 0.4);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(192, 160, 255, 0.3);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .glass-nav.scrolled {
      background: rgba(11, 12, 16, 0.92);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--esport-cyan);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 1.9rem;
      color: var(--milan-purple);
      filter: drop-shadow(0 0 6px var(--milan-purple));
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255, 255, 255, 0.85);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--milan-purple);
      transition: width 0.3s ease;
      box-shadow: 0 0 10px var(--milan-purple);
    }
    .nav-links a:hover {
      color: var(--milan-purple);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: linear-gradient(135deg, #00F0FF 0%, #00B8D4 100%);
      border: none;
      color: #0B0C10;
      font-weight: bold;
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 0.9rem;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(0,240,255,0.4);
      transition: all 0.3s;
      letter-spacing: 0.5px;
    }
    .btn-nav:hover {
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11,12,16,0.96);
        backdrop-filter: blur(25px);
        flex-direction: column;
        padding: 20px;
        gap: 1.5rem;
        border-bottom: 1px solid var(--glass-border);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .btn-nav {
        display: none;
      }
    }

    /* Hero */
    #hero {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background: radial-gradient(circle at 20% 20%, #2a1a3a, #0B0C10 80%);
    }
    .hero-bg-animation {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
    }
    .hero-content h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.8rem, 7vw, 4.2rem);
      font-weight: 800;
      background: linear-gradient(to right, #C0A0FF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 2.5rem;
    }
    .cta-group {
      display: flex;
      gap: 18px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-glass {
      background: transparent;
      border: 1px solid var(--milan-purple);
      color: var(--milan-purple);
      padding: 14px 34px;
      border-radius: 40px;
      font-weight: 600;
      backdrop-filter: blur(10px);
      transition: 0.3s;
    }
    .btn-glass:hover {
      background: rgba(192,160,255,0.15);
      box-shadow: 0 0 18px rgba(192,160,255,0.4);
    }
    .btn-glow {
      background: linear-gradient(135deg, #00F0FF, #0088cc);
      border: none;
      color: #0B0C10;
      font-weight: bold;
      padding: 14px 38px;
      border-radius: 40px;
      box-shadow: 0 0 24px #00F0FF80;
      transition: 0.3s;
    }
    .btn-glow:hover {
      box-shadow: 0 0 40px #00F0FF;
      transform: translateY(-2px);
    }

    section {
      padding: 100px 0;
    }
    h2 {
      font-family: var(--font-heading);
      font-size: 2.5rem;
      margin-bottom: 2.5rem;
      text-align: center;
      color: white;
      position: relative;
    }
    h2::after {
      content: '';
      display: block;
      width: 70px;
      height: 3px;
      background: var(--milan-purple);
      margin: 12px auto 0;
      box-shadow: 0 0 12px var(--milan-purple);
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius);
      box-shadow: var(--glass-shadow);
      transition: 0.25s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 40px rgba(0,240,255,0.15);
      border-color: rgba(0,240,255,0.5);
    }

    .asymmetric-services {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .service-large {
      min-height: 300px;
    }
    .service-small-group {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    @media (max-width: 768px) {
      .asymmetric-services {
        grid-template-columns: 1fr;
      }
    }

    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .data-item .count {
      font-size: 3rem;
      font-weight: 700;
      color: var(--esport-cyan);
      text-shadow: 0 0 18px #00F0FF;
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    @media (max-width: 640px) {
      .case-grid { grid-template-columns: 1fr; }
    }
    .case-card {
      position: relative;
      border-radius: var(--radius);
      overflow: hidden;
      height: 240px;
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.4s;
    }
    .case-card:hover img {
      transform: scale(1.05);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      background: linear-gradient(transparent, rgba(11,12,16,0.9));
      width: 100%;
      padding: 20px;
    }

    .solution-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    .accordion-item {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      margin-bottom: 12px;
      border-radius: 12px;
    }
    .accordion-title {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      color: white;
    }
    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-muted);
    }

    footer {
      background: #05060a;
      padding: 50px 0 25px;
      border-top: 1px solid rgba(192,160,255,0.2);
    }