/* roulang page: index */
:root {
      --deep-midnight: #0A1929;
      --block-bg-1: #112240;
      --block-bg-2: #1A2F4C;
      --teal: #00B4D8;
      --amber: #FFB703;
      --white: #FFFFFF;
      --text-sub: #B0C7D8;
      --text-body: #8899AA;
      --text-muted: #667788;
      --border-glow: rgba(0, 180, 216, 0.18);
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(0, 180, 216, 0.15);
      --radius-card: 16px;
      --radius-small: 8px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Mono", "Roboto Mono", monospace;
      --transition: all 0.25s ease;
      --container-max: 1200px;
      --section-gap: 120px;
    }

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

    body {
      background-color: var(--deep-midnight);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input, select, textarea {
      font-family: inherit;
    }

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

    /* 顶部信息条 */
    .top-bar {
      background: #091420;
      color: var(--text-muted);
      font-size: 12px;
      height: 36px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.04);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      width: 100%;
    }
    .top-bar a {
      color: var(--text-muted);
      transition: var(--transition);
    }
    .top-bar a:hover {
      color: var(--teal);
    }

    /* 主导航 */
    .main-nav {
      background: rgba(10, 25, 41, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      height: 72px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid rgba(0,180,216,0.08);
      transition: background 0.3s;
    }
    .main-nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--teal);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-sub);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--teal);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--amber);
    }
    .btn-nav {
      background: var(--teal);
      color: var(--deep-midnight);
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
    }
    .btn-nav:hover {
      box-shadow: 0 0 22px rgba(0,180,216,0.5);
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      color: var(--white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--teal);
      color: var(--deep-midnight);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(0,180,216,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--teal);
      color: var(--teal);
      font-weight: 500;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0,180,216,0.1);
    }
    .btn-cta {
      background: var(--amber);
      color: var(--deep-midnight);
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
      animation: pulse-glow 2s infinite;
      border: none;
      cursor: pointer;
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 5px rgba(255,183,3,0.4); }
      50% { box-shadow: 0 0 25px rgba(255,183,3,0.8); }
      100% { box-shadow: 0 0 5px rgba(255,183,3,0.4); }
    }

    section {
      padding: var(--section-gap) 0;
    }
    h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      color: var(--text-sub);
      font-size: 1.15rem;
      margin-bottom: 50px;
    }

    /* 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;
      background-blend-mode: overlay;
      background-color: rgba(10,25,41,0.75);
    }
    .hero-content {
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 24px;
      line-height: 1.2;
    }
    .hero p {
      font-size: 1.25rem;
      color: var(--text-sub);
      margin-bottom: 40px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .data-dashboard {
      background: rgba(17,34,64,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      margin-top: 60px;
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .metric {
      display: flex;
      flex-direction: column;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--amber);
      font-feature-settings: "tnum";
    }
    .metric-label {
      color: var(--text-sub);
      font-size: 0.9rem;
    }

    /* 指标看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(17,34,64,0.6);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(0,180,216,0.2);
      border-radius: 12px;
      padding: 32px 24px;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--amber);
    }

    /* 服务矩阵 非对称卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .service-card::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 4px;
      background: var(--teal);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
    }
    .service-card:hover::before {
      background: var(--amber);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--amber);
    }
    .service-text h3 {
      color: var(--white);
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .compare-card {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-card);
      padding: 36px;
      border: 1px solid rgba(255,255,255,0.06);
    }
    .compare-card.bad {
      background: rgba(255,0,0,0.03);
    }
    .compare-card.good {
      background: rgba(0,180,216,0.05);
      border-color: var(--teal);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 20px;
    }
    .check {
      color: var(--teal);
      font-weight: bold;
    }
    .cross {
      color: #ff4d6d;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      margin-bottom: 12px;
    }
    .faq-question {
      background: transparent;
      width: 100%;
      text-align: left;
      padding: 20px 10px;
      font-weight: 600;
      color: var(--white);
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 12px;
      border: none;
      cursor: pointer;
    }
    .faq-dot {
      width: 8px;
      height: 8px;
      background: var(--amber);
      border-radius: 50%;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: rgba(0,180,216,0.03);
      padding: 0 20px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px 20px;
    }

    /* 表单 */
    .contact-form {
      background: rgba(17,34,64,0.5);
      backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 48px;
      max-width: 600px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 24px;
    }
    input, select {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
      padding: 14px;
      border-radius: 8px;
      outline: none;
      transition: var(--transition);
    }
    input:focus, select:focus {
      border-color: var(--teal);
      box-shadow: 0 0 10px rgba(0,180,216,0.2);
    }

    footer {
      background: #091420;
      padding: 60px 0 30px;
      color: var(--text-muted);
      border-top: 1px solid transparent;
      border-image: linear-gradient(to right, transparent, var(--teal), transparent) 1;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 8px;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: var(--teal);
    }

    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .compare-wrapper { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero h1 { font-size: 2.2rem; }
      .services-grid { grid-template-columns: 1fr; }
      .data-dashboard { flex-direction: column; }
    }