/* roulang page: index */
:root {
      --bg-deep: #0B0E1A;
      --bg-card: rgba(15,20,40,0.6);
      --primary-cyan: #00E5FF;
      --accent-purple: #7B2FF7;
      --text-white: #FFFFFF;
      --text-lightblue: #B0C4DE;
      --text-muted: #6B7B8D;
      --border-glow: rgba(0,229,255,0.15);
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(0,229,255,0.2);
      --transition-smooth: all 0.3s ease;
      --font-heading: 'PingFang SC', 'Helvetica Neue', 'SF Pro Display', 'Inter', sans-serif;
      --font-body: 'PingFang SC', 'Helvetica Neue', 'SF Pro Text', 'Inter', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background: radial-gradient(ellipse at 30% 10%, #1a1035 0%, var(--bg-deep) 70%);
      background-attachment: fixed;
      color: var(--text-lightblue);
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      position: relative;
    }

    /* 星空粒子背景 */
    .stars-canvas {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      pointer-events: none;
      opacity: 0.6;
    }

    .container-main {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      position: relative;
      z-index: 2;
    }

    /* 导航栏 */
    .nav-glass {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11,14,26,0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(0,229,255,0.1);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      font-family: var(--font-body);
    }

    .logo-text {
      font-size: 22px;
      font-weight: 700;
      background: linear-gradient(135deg, #fff 0%, var(--primary-cyan) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.02em;
    }
    .logo-domain {
      font-size: 12px;
      color: var(--text-muted);
      margin-left: 6px;
      font-weight: 400;
      letter-spacing: 0.03em;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      color: var(--text-lightblue);
      font-size: 14px;
      font-weight: 500;
      text-decoration: none;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 8px var(--primary-cyan);
      border-radius: 2px;
    }

    .search-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-box {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 40px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      width: 170px;
      transition: width 0.3s, border-color 0.2s;
    }
    .search-box i {
      color: var(--text-muted);
      font-size: 14px;
      margin-right: 8px;
    }
    .search-box input {
      background: transparent;
      border: none;
      color: white;
      outline: none;
      width: 100%;
      font-size: 14px;
    }
    .search-box input::placeholder {
      color: var(--text-muted);
    }
    .search-box:focus-within {
      width: 210px;
      border-color: var(--primary-cyan);
    }

    .btn-nav-cta {
      background: var(--primary-cyan);
      color: var(--bg-deep);
      font-weight: 600;
      padding: 8px 20px;
      border-radius: 40px;
      font-size: 14px;
      text-decoration: none;
      transition: var(--transition-smooth);
      border: none;
      display: inline-block;
    }
    .btn-nav-cta:hover {
      background: #33F0FF;
      box-shadow: 0 0 20px rgba(0,229,255,0.8);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      font-size: 26px;
      color: var(--primary-cyan);
      cursor: pointer;
    }

    /* 移动端导航抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(11,14,26,0.96);
      backdrop-filter: blur(30px);
      display: none;
      flex-direction: column;
      padding: 40px 20px;
      z-index: 999;
    }
    .mobile-drawer a {
      color: var(--text-lightblue);
      font-size: 20px;
      padding: 16px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      text-decoration: none;
    }
    .mobile-drawer a:hover {
      color: var(--primary-cyan);
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: 72px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      width: 100%;
    }
    .hero-text {
      flex: 1 1 55%;
    }
    .hero-visual {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }
    .hero-glow {
      width: 350px;
      height: 350px;
      background: radial-gradient(circle, rgba(123,47,247,0.35) 0%, transparent 70%);
      border-radius: 50%;
      position: absolute;
      top: -20px;
      right: 40px;
      filter: blur(60px);
    }
    .hero-image-placeholder {
      width: 100%;
      max-width: 420px;
      border-radius: 32px;
      background: rgba(20,30,60,0.5);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(0,229,255,0.2);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .hero-image-placeholder img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .hero-eyebrow {
      color: var(--primary-cyan);
      font-size: 13px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      margin-bottom: 16px;
    }
    h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, #b0e5ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-lightblue);
      max-width: 520px;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-cyan);
      color: #0B0E1A;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: 8px;
      font-size: 16px;
      text-decoration: none;
      transition: var(--transition-smooth);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: #33F0FF;
      box-shadow: 0 0 30px rgba(0,229,255,0.8);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-cyan);
      color: var(--primary-cyan);
      padding: 14px 36px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      border-color: #fff;
      color: #fff;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      right: 40px;
      color: var(--primary-cyan);
      font-size: 28px;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%,20%,50%,80%,100% { transform: translateY(0); }
      40% { transform: translateY(-10px); }
      60% { transform: translateY(-4px); }
    }

    /* 区块通用 */
    section {
      padding: 100px 0 80px;
      position: relative;
    }
    .section-title-wrap {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-subhead {
      color: var(--primary-cyan);
      font-size: 14px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
    }
    h2 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 36px;
      color: white;
      margin: 12px 0 20px;
    }
    .title-decor {
      width: 70px;
      height: 3px;
      background: var(--primary-cyan);
      margin: 0 auto;
      border-radius: 4px;
      box-shadow: 0 0 12px var(--primary-cyan);
    }

    /* 卡片玻璃 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,229,255,0.4);
    }

    .service-icon {
      font-size: 38px;
      color: var(--primary-cyan);
      margin-bottom: 20px;
    }

    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-cyan);
      text-shadow: 0 0 15px rgba(0,229,255,0.5);
      font-family: 'Inter', 'SF Pro Display', sans-serif;
    }

    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
      border-bottom: 1px solid rgba(0,229,255,0.2);
    }

    .tag {
      background: rgba(0,229,255,0.15);
      color: var(--primary-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      display: inline-block;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      color: white;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-lightblue);
    }

    .contact-bg {
      background: rgba(15,20,40,0.8);
      backdrop-filter: blur(15px);
      border-radius: 24px;
      padding: 48px;
    }
    input, textarea {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 8px;
      color: white;
      padding: 12px;
      width: 100%;
      margin-bottom: 16px;
    }
    input:focus, textarea:focus {
      border-color: var(--primary-cyan);
      outline: none;
    }

    footer {
      background: #080a14;
      padding: 60px 0 20px;
      border-top: 1px solid rgba(0,229,255,0.15);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      .hero-grid { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links, .search-box { display: none; }
      .hamburger { display: block; }
      .hero-text { text-align: center; }
      .btn-group { justify-content: center; }
      h2 { font-size: 28px; }
    }