/* roulang page: index */
:root {
      --primary: #0A0E27;
      --primary-light: #0D1230;
      --primary-lighter: #11173A;
      --accent-cyan: #00F0FF;
      --accent-purple: #A855F7;
      --accent-gold: #F59E0B;
      --text-main: #EDF2F7;
      --text-muted: #A0AEC0;
      --text-dim: #718096;
      --border-glow: rgba(0,240,255,0.15);
      --card-bg: rgba(255,255,255,0.03);
      --glass-blur: blur(16px);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-card: 0 8px 32px rgba(0,240,255,0.08);
      --shadow-btn: 0 0 20px rgba(0,240,255,0.4);
      --transition: 0.25s ease-out;
      --font-title: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
      --font-body: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
      --font-mono: 'Inter','SF Pro Display',sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--primary);
    }

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

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: var(--transition);
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.12);
      transition: background 0.3s ease;
    }

    .nav.scrolled {
      background: rgba(10,14,39,0.95);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.8rem;
      color: #00F0FF;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, #00F0FF, #A855F7);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      transform: rotate(0deg);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a:focus-visible {
      color: #00F0FF;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: #00F0FF;
      transition: width 0.25s ease;
    }

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

    .btn-primary {
      background: #00F0FF;
      color: #0A0E27;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-btn);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      background: #33F5FF;
      box-shadow: 0 0 28px rgba(0,240,255,0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid #00F0FF;
      color: #00F0FF;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      backdrop-filter: blur(8px);
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 16px rgba(0,240,255,0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: #00F0FF;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 2.5rem;
      font-weight: 800;
      text-align: center;
      margin-bottom: 16px;
      color: white;
    }

    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 100px;
      background: radial-gradient(circle at 80% 30%, #0D1230 0%, #0A0E27 70%);
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-left .highlight {
      color: #00F0FF;
    }

    .hero-desc {
      color: var(--text-muted);
      margin-bottom: 32px;
      font-size: 1.15rem;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      margin-bottom: 40px;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
    }

    .stat-item h3 {
      font-family: var(--font-mono);
      font-size: 2rem;
      color: #00F0FF;
    }

    .hero-right {
      flex: 1;
      position: relative;
    }

    .hero-img {
      width: 100%;
      border-radius: 24px;
      mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
      border: 1px solid rgba(0,240,255,0.2);
    }

    /* 关于 */
    #about {
      background: var(--primary-light);
    }

    .cards-about {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .about-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 28px;
      position: relative;
      border-left: 4px solid #00F0FF;
    }

    .about-card h3 {
      margin: 16px 0 10px;
    }

    /* 服务 */
    #services {
      background: var(--primary-lighter);
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-glow);
      clip-path: polygon(0% 12px, 12px 0%, calc(100% - 12px) 0%, 100% 12px, 100% calc(100% - 12px), calc(100% - 12px) 100%, 12px 100%, 0% calc(100% - 12px));
      padding: 32px 24px;
      transition: 0.3s;
    }

    .service-card:hover {
      border-color: #00F0FF;
      box-shadow: 0 0 24px rgba(0,240,255,0.2);
    }

    .service-number {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      color: #00F0FF;
      font-weight: 700;
    }

    /* 数据 */
    #stats {
      background: linear-gradient(180deg, #0A0E27 0%, #0D1230 100%);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
    }

    .stat-big {
      font-family: var(--font-mono);
      font-size: 3.5rem;
      background: linear-gradient(135deg, #00F0FF, #A855F7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      font-weight: 800;
    }

    /* 案例 */
    #cases {
      background: var(--primary-light);
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: rgba(255,255,255,0.02);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--border-glow);
    }

    .case-img {
      height: 180px;
      object-fit: cover;
    }

    /* 流程 */
    #process {
      background: var(--primary-lighter);
    }

    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .circle {
      width: 60px;
      height: 60px;
      background: #00F0FF20;
      border: 2px solid #00F0FF;
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
    }

    /* FAQ */
    #faq {
      background: var(--primary);
    }

    .faq-item {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-glow);
      border-radius: 14px;
      margin-bottom: 16px;
      padding: 18px 24px;
    }

    /* 联系 */
    #contact {
      background: #0A0E27;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    input, textarea {
      width: 100%;
      background: #0D1230;
      border: 1px solid #2D3748;
      border-radius: var(--radius-input);
      padding: 14px;
      color: white;
      outline: none;
    }

    input:focus {
      border-color: #00F0FF;
      box-shadow: 0 0 14px #00F0FF40;
    }

    footer {
      background: #0A0E27;
      border-top: 1px solid rgba(0,240,255,0.2);
      padding: 48px 0 24px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .contact-grid { flex-direction: column; }
      .cards-about, .services-grid, .cases-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .cards-about, .services-grid, .cases-grid { grid-template-columns: 1fr; }
      .hero-left h1 { font-size: 2.4rem; }
    }