/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --deep-gray: #2C2C2C;
      --electric-green: #00E676;
      --electric-green-glow: rgba(0, 230, 118, 0.3);
      --off-white: #F5F5F7;
      --light-gray: #ECECEF;
      --deep-orange: #FF6D00;
      --text-primary: #333333;
      --text-secondary: #555555;
      --text-muted: #888888;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-glow: 0 4px 16px rgba(0,230,118,0.3);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'SF Mono', 'Cascadia Code', monospace;
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--off-white);
      color: var(--text-primary);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(26, 26, 26, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 12px 0;
      transition: background 0.3s;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--electric-green);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M13.5 2L12 7.5l4-2.5-3 5.5 6-2-4.5 7H21l-7.5 6 2-8.5L9 20l3-10.5H6l4.5-6L9 6.5 13.5 2z"/></svg>') no-repeat center;
      background-color: var(--electric-green);
      mask-size: contain;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M13.5 2L12 7.5l4-2.5-3 5.5 6-2-4.5 7H21l-7.5 6 2-8.5L9 20l3-10.5H6l4.5-6L9 6.5 13.5 2z"/></svg>') no-repeat center;
      -webkit-mask-size: contain;
    }

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

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: #CCCCCC;
      letter-spacing: 0.3px;
      padding: 4px 0;
      position: relative;
    }

    .nav-links a:hover {
      color: var(--electric-green);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-green);
      transition: width 0.25s ease;
    }

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

    .mobile-nav {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #1A1A1A 0%, #2C2C2C 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin-left: 0;
    }

    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 3.5rem);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.125rem;
      color: #B0B0B0;
      margin-bottom: 36px;
      max-width: 560px;
    }

    .hero-stats {
      display: flex;
      gap: 48px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .hero-stat {
      display: flex;
      flex-direction: column;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--electric-green);
      line-height: 1.1;
    }

    .stat-label {
      font-size: 0.9rem;
      color: #AAAAAA;
      margin-top: 6px;
    }

    .btn-primary {
      background: var(--electric-green);
      color: #1A1A1A;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1rem;
      cursor: pointer;
      display: inline-block;
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(0,230,118,0.25);
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      background: #00ff84;
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-black);
      color: var(--primary-black);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: 0.25s;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--primary-black);
      color: white;
    }

    .btn-white-outline {
      border-color: white;
      color: white;
    }

    .btn-white-outline:hover {
      background: white;
      color: #1A1A1A;
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 48px;
      color: var(--primary-black);
      letter-spacing: -0.3px;
    }

    .bg-light {
      background-color: var(--off-white);
    }

    .bg-gray {
      background-color: var(--light-gray);
    }

    .bg-dark {
      background-color: var(--primary-black);
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .data-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .data-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .data-value {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--electric-green);
      margin-bottom: 8px;
    }

    .data-trend {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 0.85rem;
      color: var(--deep-orange);
    }

    /* 服务矩阵 不对称网格 */
    .service-matrix {
      display: grid;
      grid-template-columns: 8fr 4fr;
      gap: 28px;
    }

    .large-service {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 28px;
      align-items: center;
      transition: 0.25s;
    }

    .large-service:hover {
      box-shadow: var(--shadow-md);
    }

    .service-img {
      width: 160px;
      height: 110px;
      background: #e0e0e0;
      border-radius: 10px;
      overflow: hidden;
      flex-shrink: 0;
    }

    .small-tags {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .tag-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 16px;
      transition: 0.25s;
    }

    .tag-card:hover {
      background: #f0f0f2;
    }

    /* 对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px;
    }

    .compare-card.dark {
      background: #2C2C2C;
      color: white;
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 24px;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

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

    .step-circle {
      width: 64px;
      height: 64px;
      background: white;
      border: 2px solid #ccc;
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.5rem;
      transition: 0.3s;
    }

    .step:hover .step-circle {
      background: var(--electric-green);
      border-color: var(--electric-green);
      color: #1A1A1A;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.1rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #555;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA 表单 */
    .cta-form {
      background: #1e1e1e;
      border-radius: 24px;
      padding: 56px 48px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .form-row {
      display: flex;
      gap: 16px;
      width: 100%;
      max-width: 700px;
      margin-top: 28px;
    }

    .form-input {
      flex: 1;
      background: #2C2C2C;
      border: 1px solid #444;
      border-radius: var(--radius-input);
      padding: 14px 18px;
      color: white;
      font-size: 1rem;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .service-matrix { grid-template-columns: 1fr; }
      .compare-row { grid-template-columns: 1fr; }
      .steps { flex-wrap: wrap; gap: 28px; }
    }

    @media (max-width: 768px) {
      .header { display: none; }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: #1A1A1A;
        justify-content: space-around;
        padding: 10px 0;
        z-index: 100;
      }
      .mobile-nav a {
        color: #aaa;
        font-size: 0.7rem;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .mobile-nav a.active { color: var(--electric-green); }
      .hero h1 { font-size: 2.2rem; }
      .form-row { flex-direction: column; }
    }