/* roulang page: index */
:root {
      --deep-space: #1A0A2E;
      --nebula-purple: #3D1F6B;
      --aurora-cyan: #00F0B5;
      --stellar-gold: #FFD700;
      --dark-matter: #0D0D0D;
      --bg-dark: #0F0F1A;
      --bg-card: rgba(255,255,255,0.03);
      --text-primary: #F0F0F5;
      --text-secondary: #B0B0C0;
      --border-cyan: rgba(0,240,181,0.2);
      --border-hover: rgba(0,240,181,0.6);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.5);
      --shadow-glow: 0 0 20px rgba(0,240,181,0.3);
      --radius-xl: 20px;
      --radius-full: 50px;
      --max-width: 1320px;
      --gap-section: 100px;
    }

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

    body {
      font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .header.scrolled {
      background: rgba(26, 10, 46, 0.75);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      max-width: var(--max-width);
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.8rem;
      color: #fff;
      text-decoration: none;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #00F0B5, #FFD700);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 6px #00F0B5);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: #ddd;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--aurora-cyan);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .badge-pulse {
      background: var(--stellar-gold);
      color: #000;
      font-weight: 700;
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 30px;
      animation: pulse-gold 2s infinite;
      white-space: nowrap;
    }
    @keyframes pulse-gold {
      0% { box-shadow: 0 0 0 0 rgba(255,215,0,0.6); }
      70% { box-shadow: 0 0 0 10px rgba(255,215,0,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,215,0,0); }
    }
    .btn {
      display: inline-block;
      padding: 12px 28px;
      border-radius: var(--radius-full);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s;
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00F0B5, #FFD700);
      color: #0A0A0A;
      box-shadow: 0 4px 15px rgba(0,240,181,0.4);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 25px rgba(0,240,181,0.7);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--aurora-cyan);
      color: var(--aurora-cyan);
    }
    .btn-outline:hover {
      background: rgba(0,240,181,0.1);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 2rem;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(26,10,46,0.7) 0%, rgba(0,0,0,0.9) 90%);
      z-index: 1;
    }
    .particles {
      position: absolute;
      inset: 0;
      z-index: 2;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 3;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 4.2rem);
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #c0f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero .sub {
      font-size: 1.25rem;
      color: #ccc;
      margin-bottom: 2.5rem;
      max-width: 600px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .floating-badge {
      position: absolute;
      bottom: 40px;
      right: 30px;
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-cyan);
      border-radius: 30px;
      padding: 12px 24px;
      color: var(--aurora-cyan);
      font-weight: 700;
      z-index: 3;
      box-shadow: var(--shadow-glow);
    }

    /* 通用板块 */
    section {
      padding: var(--gap-section) 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
      color: #fff;
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 3rem;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 优势 1-2-1 交错 */
    .advantages-grid {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .adv-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .adv-row.reverse {
      grid-template-columns: 1fr 1fr;
    }
    .adv-card {
      background: var(--bg-card);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-xl);
      padding: 32px;
      transition: all 0.3s;
    }
    .adv-card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 2.5rem;
      color: var(--aurora-cyan);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    /* 数据徽章墙 */
    .badge-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 10px 0 20px;
      scrollbar-width: thin;
    }
    .stat-badge {
      flex: 0 0 200px;
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-cyan);
      border-radius: 24px;
      padding: 24px;
      text-align: center;
      transition: 0.3s;
    }
    .stat-badge:hover {
      border-color: var(--stellar-gold);
      box-shadow: 0 0 25px rgba(255,215,0,0.3);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00F0B5, #FFD700);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 服务卡片 */
    .service-row {
      display: flex;
      gap: 32px;
      margin-bottom: 48px;
      align-items: center;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      background: #1e1e2e;
      border-radius: 24px;
      overflow: hidden;
    }
    .service-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    .service-text {
      flex: 1;
    }
    .tag {
      display: inline-block;
      background: rgba(0,240,181,0.1);
      color: var(--aurora-cyan);
      padding: 4px 14px;
      border-radius: 30px;
      font-size: 0.85rem;
      margin-bottom: 12px;
    }

    /* 案例网格 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .case-card {
      background: var(--bg-card);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-xl);
      overflow: hidden;
      border: 1px solid var(--border-cyan);
      transition: 0.3s;
    }
    .case-card:hover {
      border-color: var(--aurora-cyan);
      transform: translateY(-5px);
    }
    .case-thumb {
      height: 180px;
      background: #2a2a3a;
    }
    .case-info {
      padding: 20px;
    }

    /* 时间轴 */
    .timeline {
      display: flex;
      flex-direction: column;
      gap: 32px;
      max-width: 700px;
      margin: 0 auto;
    }
    .step {
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .step-num {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--aurora-cyan);
      line-height: 1;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border: 1px solid var(--border-cyan);
      border-radius: 16px;
      margin-bottom: 16px;
      background: rgba(255,255,255,0.02);
      transition: 0.2s;
      cursor: pointer;
    }
    .faq-question {
      padding: 20px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: #ccc;
    }
    .faq-item.active {
      border-color: var(--aurora-cyan);
      background: rgba(0,240,181,0.05);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A0A2E, #3D1F6B);
      text-align: center;
      padding: 80px 0;
    }
    .input-group {
      display: flex;
      max-width: 500px;
      margin: 24px auto;
      gap: 8px;
    }
    .input-group input {
      flex: 1;
      background: #0D0D0D;
      border: 1px solid var(--aurora-cyan);
      padding: 14px;
      border-radius: 40px;
      color: #fff;
    }

    /* 页脚 */
    .footer {
      background: #0A0A12;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #aaa;
      text-decoration: none;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero h1 { font-size: 2.2rem; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .adv-row { grid-template-columns: 1fr; }
      .badge-scroll { gap: 16px; }
    }