/* roulang page: index */
:root {
      --deep-green: #0B1E1A;
      --cyber-cyan: #00E5A0;
      --comp-orange: #FF6B35;
      --warm-bg: #F4F0EB;
      --charcoal: #1E1E1E;
      --white: #FFFFFF;
      --light-green-bg: #E8F0EC;
      --soft-shadow: 0 4px 20px rgba(11,30,26,0.08);
      --hover-shadow: 0 8px 30px rgba(11,30,26,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --transition: all 0.25s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'DIN Alternate', 'SF Mono', 'Menlo', monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--warm-bg);
      color: var(--charcoal);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      z-index: 1000;
      background: rgba(255,255,255,0.72);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(11,30,26,0.08);
      transition: background 0.3s, box-shadow 0.3s;
    }
    #header.scrolled {
      background: rgba(255,255,255,0.92);
      box-shadow: 0 2px 12px rgba(11,30,26,0.1);
      border-bottom: 1px solid #cbd5d1;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      padding: 0 32px;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--deep-green);
      letter-spacing: 1px;
      font-family: var(--font-title);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--cyber-cyan);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2zm0 3.5L19.5 19h-15L12 5.5z"/></svg>') center/contain no-repeat;
      background: var(--deep-green);
      mask-size: contain;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--charcoal);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--cyber-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyber-cyan);
      transition: width 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-green);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--deep-green);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 36px;
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 26px;
      color: white;
      font-weight: 600;
      font-family: var(--font-title);
    }
    .mobile-menu .close-btn {
      position: absolute;
      top: 28px;
      right: 32px;
      font-size: 36px;
      color: white;
      cursor: pointer;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0B1E1A 0%, #143D30 100%);
      padding: 140px 0 80px;
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image: repeating-linear-gradient(0deg, rgba(0,229,160,0.04) 0px, rgba(0,229,160,0.04) 1px, transparent 1px, transparent 40px), repeating-linear-gradient(90deg, rgba(0,229,160,0.04) 0px, rgba(0,229,160,0.04) 1px, transparent 1px, transparent 40px);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      color: white;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 22px;
      color: var(--cyber-cyan);
      margin-bottom: 32px;
      font-weight: 400;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyber-cyan);
      color: var(--deep-green);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: 0.2s;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: #00cc8c;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep-green);
    }
    .data-card-preview {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: 16px;
      padding: 24px;
      color: white;
      width: 100%;
      max-width: 340px;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .live-badge {
      display: flex; gap: 8px; align-items: center; margin-bottom: 16px;
    }
    .pulse {
      width: 10px; height: 10px; background: var(--cyber-cyan); border-radius: 50%; animation: pulse 1.4s infinite;
    }
    @keyframes pulse { 0% { opacity:1; } 50% { opacity:0.4; } 100% { opacity:1; } }
    .mock-chart {
      height: 40px; background: linear-gradient(90deg, #00E5A0, #143D30); border-radius: 6px; margin: 12px 0;
    }
    /* 指标看板 */
    #metrics {
      padding: 100px 0;
      background: var(--warm-bg);
    }
    .section-title {
      font-family: var(--font-title);
      font-weight: 600;
      font-size: 32px;
      color: var(--charcoal);
      text-align: center;
      margin-bottom: 48px;
    }
    .metrics-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .metric-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--soft-shadow);
      min-width: 220px;
      flex: 1;
      border-top: 4px solid var(--cyber-cyan);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--hover-shadow);
    }
    .metric-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 42px;
      color: var(--cyber-cyan);
    }
    .metric-label {
      color: #5e6b66;
      font-size: 14px;
    }
    /* 服务交错 */
    #services {
      padding: 100px 0;
      background: white;
    }
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--soft-shadow);
    }
    .service-img img {
      width: 100%;
      height: auto;
    }
    .service-text {
      flex: 1;
    }
    .service-text h3 {
      font-size: 26px;
      font-weight: 600;
      margin-bottom: 14px;
      font-family: var(--font-title);
    }
    .arrow-link {
      color: var(--cyber-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 12px;
      transition: 0.2s;
    }
    .arrow-link:hover {
      gap: 14px;
    }
    /* 对比 */
    #comparison {
      padding: 100px 0;
      background: var(--light-green-bg);
    }
    .compare-table {
      display: flex;
      gap: 24px;
      max-width: 900px;
      margin: 0 auto;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: 16px;
      padding: 28px;
    }
    .compare-col.bad {
      background: #f9ecec;
    }
    .compare-col.good {
      background: #e6f4ec;
    }
    .compare-item {
      display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid #ddd;
    }
    /* FAQ */
    #faq {
      padding: 100px 0;
      background: var(--warm-bg);
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      transition: 0.2s;
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .faq-num {
      font-family: var(--font-mono);
      color: var(--cyber-cyan);
      font-weight: 700;
      font-size: 20px;
    }
    .faq-content {
      flex: 1;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: #5e6b66;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 联系 */
    #contact {
      background: var(--deep-green);
      padding: 100px 0;
      color: white;
    }
    .contact-form {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      max-width: 700px;
      margin: 32px auto 0;
    }
    .contact-form input {
      flex: 1;
      padding: 14px;
      border-radius: 8px;
      border: none;
      background: white;
    }
    .btn-orange {
      background: var(--comp-orange);
      color: white;
      font-weight: 700;
      padding: 14px 32px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
    }
    .btn-orange:hover {
      background: #e55a2b;
    }
    footer {
      text-align: center;
      padding: 40px 0 20px;
      color: #b0b8b4;
    }
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .hero h1 { font-size: 34px; }
    }