/* roulang page: index */
:root {
      --deep-space: #0B0C10;
      --space-indigo: #1A1F36;
      --star-purple: #7B2FBE;
      --star-purple-light: #A463F2;
      --particle-cyan: #00F0FF;
      --text-white: #FFFFFF;
      --text-light-gray: #E0E0E0;
      --text-muted: #9A9DA8;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(163,99,242,0.2);
      --glass-hover-bg: rgba(255,255,255,0.06);
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-glow: 0 8px 32px rgba(123,47,190,0.25);
      --cyan-glow: 0 0 24px rgba(0,240,255,0.6);
      --transition-smooth: 0.3s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--deep-space);
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      background: radial-gradient(ellipse at 30% 20%, #1A1F36 0%, #0B0C10 70%);
      color: var(--text-light-gray);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    h1, h2, h3 {
      font-family: 'Space Grotesk', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      color: var(--text-white);
    }
    h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 64px;
      height: 3px;
      background: linear-gradient(90deg, var(--particle-cyan), var(--star-purple-light));
      border-radius: 2px;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    a {
      color: var(--star-purple-light);
      text-decoration: none;
      transition: color var(--transition-smooth);
    }
    a:hover {
      color: var(--particle-cyan);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 991px) {
      .container { padding: 0 32px; }
    }
    @media (max-width: 767px) {
      .container { padding: 0 20px; }
      h1 { font-size: 2rem; }
      h2 { font-size: 1.75rem; }
      h3 { font-size: 1.25rem; }
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11,12,16,0.72);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(163,99,242,0.15);
      transition: background var(--transition-smooth);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 40px;
      max-width: 1280px;
      margin: 0 auto;
      flex-wrap: wrap;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 0.5px;
    }
    .brand-icon {
      width: 32px;
      height: 32px;
      background: radial-gradient(circle, var(--particle-cyan), var(--star-purple));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition-smooth);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--particle-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--particle-cyan);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon {
      background: none;
      border: none;
      color: var(--text-muted);
      font-size: 1.2rem;
      cursor: pointer;
      transition: color var(--transition-smooth);
    }
    .search-icon:hover {
      color: var(--particle-cyan);
    }
    .btn-consult {
      border: 1.5px solid var(--particle-cyan);
      background: transparent;
      color: var(--particle-cyan);
      padding: 8px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: all var(--transition-smooth);
      white-space: nowrap;
    }
    .btn-consult:hover {
      background: var(--particle-cyan);
      color: var(--deep-space);
      box-shadow: var(--cyan-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-white);
      transition: var(--transition-smooth);
    }
    @media (max-width: 991px) {
      .main-nav { display: none; width: 100%; flex-direction: column; align-items: flex-start; padding: 20px 0; }
      .main-nav.open { display: flex; }
      .nav-links { flex-direction: column; gap: 16px; width: 100%; }
      .hamburger { display: flex; }
      .header-inner { flex-wrap: wrap; }
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 767px) {
      section { padding: 80px 0; }
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(11,12,16,0.4) 0%, rgba(11,12,16,0.85) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      margin-bottom: 1.5rem;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      border: 1.5px solid var(--particle-cyan);
      background: transparent;
      color: var(--particle-cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition-smooth);
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--particle-cyan);
      color: var(--deep-space);
      box-shadow: var(--cyan-glow);
    }
    .btn-secondary {
      background: rgba(123,47,190,0.25);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition-smooth);
    }
    .btn-secondary:hover { background: var(--star-purple); }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .capability-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition-smooth);
    }
    .capability-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
      border-color: var(--star-purple-light);
    }
    .capability-icon {
      width: 48px;
      height: 48px;
      background: rgba(0,240,255,0.1);
      border-radius: 12px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--particle-cyan);
    }
    /* 数据模块 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-number {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--particle-cyan), var(--star-purple-light));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    /* 解决方案交替卡片 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .solution-text {
      flex: 1;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(163,99,242,0.15);
      padding: 24px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      padding-left: 28px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(163,99,242,0.3);
      border-radius: 8px;
      padding: 14px;
      color: white;
      margin-bottom: 16px;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--particle-cyan);
      outline: none;
      box-shadow: 0 0 8px rgba(0,240,255,0.3);
    }
    footer {
      background: #0B0C10;
      border-top: 1px solid rgba(163,99,242,0.1);
      padding: 60px 0 30px;
      color: var(--text-muted);
    }
    @media (max-width: 767px) {
      .grid-3, .metrics-grid { grid-template-columns: 1fr; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .contact-grid { grid-template-columns: 1fr; }
    }