/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --deep: #0A0E27;
      --light-deep: #0D1230;
      --dark-footer: #080B1A;
      --mid-blue: #1A3A6B;
      --cyan: #00C6FF;
      --gold: #C9A96E;
      --cold-white: #E0E6F0;
      --secondary-text: #8892B0;
      --white: #FFFFFF;
      --glass-bg: rgba(10, 14, 39, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --condition-border: 1px solid rgba(255, 248, 235, 0.15);
      --border-radius-card: 16px;
      --border-radius-btn: 8px;
      --max-width: 1280px;
      --section-py: 100px;
      --card-gap: 24px;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background: linear-gradient(135deg, #0A0E27 0%, #0D1230 100%);
      color: var(--cold-white);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      z-index: 1000;
      transition: background 0.3s ease;
      height: 72px;
    }
    .nav.scrolled {
      background: rgba(10, 14, 39, 0.95);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 1px;
    }
    .logo .brand-text {
      background: linear-gradient(135deg, #fff 0%, #e0c78c 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--cold-white);
      letter-spacing: 0.5px;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 28px;
      height: 20px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }
    .hamburger span {
      width: 100%;
      height: 2px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(8, 11, 26, 0.96);
      backdrop-filter: blur(25px);
      flex-direction: column;
      padding: 40px 32px;
      gap: 32px;
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--cold-white);
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    /* 通用板块样式 */
    section {
      padding: var(--section-py) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 12px;
      letter-spacing: 1px;
    }
    .title-highlight {
      color: var(--gold);
    }
    .subheadline {
      font-size: 1rem;
      color: var(--secondary-text);
      max-width: 700px;
      margin: 0 auto;
    }
    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top:72px;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.28;
      z-index: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(26,58,107,0.4) 0%, rgba(10,14,39,0.85) 80%);
      z-index: 2;
    }
    .hero .container {
      position: relative;
      z-index: 5;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      max-width: 800px;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--white);
      margin-bottom: 24px;
      text-shadow: 0 2px 15px rgba(0,198,255,0.3);
    }
    .hero-sub {
      font-size: 1.1rem;
      color: #b0bbd1;
      margin-bottom: 40px;
      max-width: 600px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.6px;
      font-size: 1rem;
      box-shadow: 0 0 18px rgba(0,198,255,0.5);
      transition: all 0.28s;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,198,255,0.9);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(0,198,255,0.5);
      color: var(--cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      backdrop-filter: blur(10px);
      transition: 0.3s;
    }
    .btn-ghost:hover {
      background: rgba(0,198,255,0.08);
      border-color: var(--cyan);
    }
    /* 玻璃卡片 */
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(16px) saturate(120%);
      -webkit-backdrop-filter: blur(16px) saturate(120%);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: 0 15px 35px rgba(0,0,0,0.5);
      transition: transform 0.2s ease, box-shadow 0.2s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 18px 38px rgba(0,198,255,0.2);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--card-gap);
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--card-gap);
    }
    .icon-gold {
      color: var(--gold);
      font-size: 2rem;
      margin-bottom: 18px;
    }
    .data-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--gold);
      line-height: 1.2;
    }
    .service-icon {
      font-size: 2.3rem;
      margin-bottom: 20px;
      color: var(--gold);
    }
    /* 案例卡片 */
    .case-card {
      position: relative;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      height: 280px;
    }
    .case-bg {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(10,14,39,0.8) 0%, rgba(0,0,0,0.2) 60%);
    }
    .case-content {
      position: absolute;
      bottom: 24px;
      left: 24px;
      z-index: 3;
      color: white;
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 22px 32px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding: 0 32px 22px;
      color: var(--secondary-text);
      display: none;
    }
    .faq-item.active .faq-answer { display: block; }
    /* 表单 */
    .cta-input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.12);
      color: white;
      padding: 14px;
      border-radius: var(--border-radius-btn);
      width: 100%;
      max-width: 320px;
    }
    .cta-input:focus {
      border-color: var(--cyan);
      outline: none;
      box-shadow: 0 0 12px cyan;
    }
    /* footer */
    .footer {
      background: var(--dark-footer);
      padding: 60px 0 24px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 24px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.3rem; }
      .hero-sub { font-size: 1rem; }
      section { padding: 60px 0; }
    }
    @media (max-width: 520px) {
      .btn-group { flex-direction: column; width: 100%; }
    }