/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-glow: rgba(123, 47, 247, 0.6);
      --secondary: #E5007E;
      --bg-deep: #0D0D0F;
      --bg-surface: #131317;
      --bg-card: #18181D;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-muted: #6B6B7D;
      --border-subtle: rgba(255,255,255,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 4px 24px rgba(123,47,247,0.12);
      --shadow-hover: 0 8px 40px rgba(123,47,247,0.25);
      --container-max: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .font-headline {
      font-family: 'Oswald', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      font-weight: 700;
      letter-spacing: 1px;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(13,13,15,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      letter-spacing: 2px;
    }
    .logo i {
      font-size: 1.5rem;
      background: none;
      -webkit-text-fill-color: var(--primary);
      color: var(--primary);
      text-shadow: 0 0 12px var(--primary-glow);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
      box-shadow: 0 0 8px var(--primary-glow);
    }
    .nav-link:hover {
      color: #FFFFFF;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
      text-decoration: none;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 14px rgba(123,47,247,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 24px var(--primary-glow);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
      border-color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
      z-index: 1001;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(15,15,20,0.96);
        backdrop-filter: blur(24px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 48px;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -10px 0 40px rgba(0,0,0,0.5);
        border-left: 1px solid var(--border-subtle);
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-link {
        font-size: 1.4rem;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: linear-gradient(135deg, #0D0D0F 0%, #1A0A2E 50%, #0D0D0F 100%);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero-bg-img {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.35;
      mix-blend-mode: overlay;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 20px;
    }
    .hero h1 {
      font-size: clamp(3rem, 8vw, 4.2rem);
      font-weight: 800;
      background: linear-gradient(to right, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
      font-weight: 400;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 40px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--text-muted);
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }
    @keyframes bounce {
      0%, 100% { transform: translateX(-50%) translateY(0); }
      50% { transform: translateX(-50%) translateY(10px); }
    }
    /* 板块标题 */
    .section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: white;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 28px;
      background: var(--primary);
      border-radius: 4px;
      box-shadow: 0 0 14px var(--primary-glow);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    @media (max-width: 1024px) {
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
    }
    .card {
      background: rgba(255,255,255,0.03);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
      backdrop-filter: blur(8px);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(123,47,247,0.3);
    }
    .card-icon {
      font-size: 2.6rem;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .card h3 {
      font-size: 1.5rem;
      color: white;
      margin-bottom: 12px;
    }
    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      background: var(--bg-surface);
      border-radius: 16px;
      padding: 36px 24px;
      border: 1px solid var(--border-subtle);
    }
    .stat-number {
      font-family: 'Oswald', 'DIN Alternate', sans-serif;
      font-size: 3.3rem;
      font-weight: 700;
      color: var(--primary);
      text-shadow: 0 0 12px var(--primary-glow);
    }
    @media (max-width: 640px) {
      .stats-bar {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
      }
    }
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 0 30px rgba(123,47,247,0.25);
    }
    .service-img img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .service-text {
      flex: 1;
    }
    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 1.2rem;
      color: white;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary);
      padding-left: 10px;
      border-left: 3px solid var(--primary);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .cta-band {
      background: var(--bg-surface);
      text-align: center;
      padding: 80px 24px;
      background-image: radial-gradient(circle at 20% 30%, rgba(123,47,247,0.1) 0%, transparent 40%);
    }
    .footer {
      background: #0A0A0C;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: var(--primary);
      transition: 0.2s;
    }
    a {
      color: var(--text-secondary);
      text-decoration: none;
    }