/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-glow: rgba(240, 78, 35, 0.6);
      --accent-gold: #F7B731;
      --dark-coal: #1A1D26;
      --card-bg: #3A3F4A;
      --soft-sand: #F5F1EB;
      --text-primary: #1A1D26;
      --text-secondary: #5A5D66;
      --text-on-dark: #F5F1EB;
      --border-soft: rgba(247, 183, 49, 0.15);
      --glass-bg: rgba(26, 29, 38, 0.6);
      --blur-amount: 16px;
      --radius-card: 20px;
      --radius-btn: 40px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.25);
      --font-sans: 'Inter', 'MiSans', 'PingFang SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--soft-sand);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, textarea, select {
      font-family: inherit;
    }

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

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 29, 38, 0.75);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: #fff;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 20px;
      position: relative;
      overflow: hidden;
    }

    .logo-icon::after {
      content: '';
      position: absolute;
      width: 20px;
      height: 2px;
      background: var(--accent-gold);
      top: 50%;
      left: 8px;
      transform: rotate(-35deg);
      box-shadow: 0 0 8px var(--accent-gold);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      color: #ddd;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: #fff;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(240,78,35,0.5);
      margin-left: 10px;
    }

    .btn-nav:hover {
      box-shadow: 0 0 28px var(--primary-glow);
      transform: translateY(-1px);
      background: #ff5e35;
    }

    .mobile-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }

    .mobile-toggle span {
      width: 26px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 12, 16, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 999;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: #fff;
      position: relative;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(circle at 30% 40%, rgba(26,29,38,0.5) 0%, #1A1D26 90%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      overflow: hidden;
    }

    .hero-particles {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(247,183,49,0.08) 0%, transparent 35%);
      pointer-events: none;
    }

    .light-ray {
      position: absolute;
      width: 2px;
      height: 80px;
      background: linear-gradient(transparent, rgba(240,78,35,0.25));
      top: 20%;
      left: 70%;
      transform: rotate(15deg);
      filter: blur(2px);
    }

    .hero-content {
      text-align: center;
      color: white;
      position: relative;
      z-index: 2;
      max-width: 900px;
    }

    .hero h1 {
      font-size: clamp(2.8rem, 8vw, 4.2rem);
      font-weight: 700;
      letter-spacing: 2px;
      margin-bottom: 16px;
      text-shadow: 0 0 30px rgba(240,78,35,0.5);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: #ddd;
      margin-bottom: 40px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 1px;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 4px 20px rgba(240,78,35,0.5);
    }

    .btn-primary:hover {
      box-shadow: 0 0 32px var(--primary-glow);
      transform: translateY(-2px);
      background: #f85a33;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: 0.3s;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: var(--accent-gold);
      color: #1A1D26;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--dark-coal);
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .data-cards {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    .data-item {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-soft);
      border-radius: 20px;
      padding: 24px;
      text-align: center;
      color: white;
    }

    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .service-card {
      background: rgba(26,29,38,0.8);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 32px;
      color: white;
      display: flex;
      gap: 24px;
      align-items: center;
    }

    .service-card.wide {
      grid-column: span 2;
      justify-content: center;
      text-align: center;
      flex-direction: column;
    }

    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }

    .case-card {
      min-width: 320px;
      background: #2f333d;
      border-radius: 24px;
      overflow: hidden;
    }

    .faq-item {
      border-bottom: 1px solid #ccc;
      padding: 20px 0;
    }

    .footer {
      background: #0f1115;
      color: #ccc;
      padding: 60px 0 24px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: flex; }
      .about-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .service-card.wide { grid-column: span 1; }
    }