/* roulang page: index */
:root {
      --primary: #0AFF9E;
      --primary-dark: #00D68F;
      --accent: #FF5E3A;
      --bg-deep: #0B0E14;
      --bg-card: #141820;
      --border-dim: #1F2630;
      --text-main: #FFFFFF;
      --text-body: #B0B8C1;
      --text-muted: #6B7380;
      --radius-lg: 16px;
      --radius-btn: 50px;
      --radius-sm: 10px;
      --shadow-glow: 0 0 20px rgba(10,255,158,0.25);
      --font-mono: 'Inter', 'SF Mono', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, border-color 0.2s ease;
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(10,255,158,0.1);
      padding: 0 24px;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-main);
      letter-spacing: 1px;
    }
    .logo span {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 500;
      margin-left: 2px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover {
      color: var(--primary);
      text-shadow: 0 0 8px rgba(10,255,158,0.4);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
      box-shadow: 0 0 10px var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 8px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
      margin-left: 12px;
    }
    .btn-nav-cta:hover {
      background: var(--primary);
      color: var(--bg-deep);
      box-shadow: var(--shadow-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-main);
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 72px;
      text-align: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(10,255,158,0.08) 0%, rgba(11,14,20,0.85) 80%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 6vw, 3.5rem);
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: 2px;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 36px;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #0AFF9E, #00D68F);
      border: none;
      color: #0B0E14;
      font-weight: 700;
      padding: 14px 38px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 0 15px rgba(10,255,158,0.3);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 0 28px rgba(10,255,158,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 38px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #0B0E14;
    }
    .live-badge {
      position: absolute;
      bottom: 30px;
      right: 30px;
      background: rgba(20,24,32,0.9);
      backdrop-filter: blur(8px);
      padding: 10px 24px;
      border-radius: 40px;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      font-size: 0.9rem;
      z-index: 3;
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-main);
      text-align: center;
      margin-bottom: 16px;
    }
    .section-desc {
      text-align: center;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      text-align: center;
      transition: 0.3s;
    }
    .metric-card:hover {
      border-color: var(--primary);
      box-shadow: 0 0 18px rgba(10,255,158,0.1);
    }
    .metric-icon {
      font-size: 2rem;
      margin-bottom: 12px;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), #00B8FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .metric-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      transition: 0.3s;
    }
    .service-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: 0 0 24px rgba(10,255,158,0.15);
    }
    .service-icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 12px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }
    .tag {
      background: rgba(10,255,158,0.1);
      color: var(--primary);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
      border: 1px solid rgba(10,255,158,0.2);
    }

    /* 对比 */
    .comparison-wrapper {
      display: flex;
      gap: 24px;
      align-items: stretch;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-dim);
    }
    .comp-col {
      flex: 1;
    }
    .comp-col h3 {
      font-size: 1.6rem;
      margin-bottom: 24px;
      color: #fff;
    }
    .comp-list {
      list-style: none;
    }
    .comp-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 1rem;
    }
    .bad {
      color: #ff5e5e;
    }
    .good {
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.1rem;
      font-weight: 600;
      padding: 22px 28px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 28px 22px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active {
      border-color: var(--primary);
    }

    /* CTA表单 */
    .cta-section {
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .cta-section::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(11,14,20,0.8);
    }
    .cta-form {
      position: relative;
      z-index: 2;
      max-width: 580px;
      margin: 0 auto;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
    }
    .cta-input {
      flex: 2;
      min-width: 240px;
      background: #0B0E14;
      border: 1px solid var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 22px;
      color: #fff;
    }
    .cta-btn {
      flex: 1;
      background: linear-gradient(135deg, #0AFF9E, #00D68F);
      border: none;
      border-radius: var(--radius-btn);
      font-weight: 700;
      padding: 14px 28px;
      cursor: pointer;
    }

    /* 页脚 */
    .footer {
      background: #0A0D12;
      padding: 48px 0 24px;
      border-top: 1px solid var(--border-dim);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    .footer-bottom {
      text-align: center;
      margin-top: 36px;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .services-grid, .metrics-grid { grid-template-columns: 1fr; }
      .comparison-wrapper { flex-direction: column; }
    }