/* roulang page: index */
/* ===== 设计变量与全局重置 ===== */
    :root {
      --primary-orange: #FF4D2E;
      --deep-black: #0B0D12;
      --cyan-highlight: #00E5FF;
      --semantic-green: #00C853;
      --warning-yellow: #FFAB00;
      --card-bg: #1A1D24;
      --divider: #2A2D35;
      --text-muted: #7A7F8A;
      --text-body: #C0C4CC;
      --text-white: #FFFFFF;
      --glass-bg: rgba(26, 29, 36, 0.75);
      --blur-amount: 18px;
      --border-radius-card: 16px;
      --border-radius-btn: 10px;
      --border-radius-input: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
      --shadow-glow: 0 0 18px rgba(255, 77, 46, 0.6);
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--deep-black);
      color: var(--text-body);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

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

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

    /* 容器 */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 板块标题通用样式 */
    .section-title {
      font-size: 32px;
      font-weight: 600;
      line-height: 1.35;
      color: var(--text-white);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 28px;
      background: var(--cyan-highlight);
      margin-right: 16px;
      border-radius: 2px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* ===== 导航系统 ===== */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      padding: 16px 0;
    }
    .main-header.scrolled {
      background: rgba(11, 13, 18, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--divider);
      padding: 12px 0;
    }
    .header-inner {
      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: 10px;
      font-size: 24px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
    }
    .logo i {
      font-size: 28px;
      color: var(--primary-orange);
      filter: drop-shadow(0 0 8px rgba(255,77,46,0.5));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan-highlight);
    }
    .nav-cta {
      background: var(--primary-orange);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      box-shadow: var(--shadow-glow);
      transition: box-shadow 0.3s, background 0.3s;
    }
    .nav-cta:hover {
      background: #E04325;
      box-shadow: 0 0 24px rgba(255,77,46,0.8);
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 13, 18, 0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid var(--divider);
      justify-content: space-around;
      padding: 10px 0;
      z-index: 999;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 12px;
      transition: color 0.2s;
    }
    .mobile-nav-item i {
      font-size: 20px;
      margin-bottom: 4px;
    }
    .mobile-nav-item.active {
      color: var(--cyan-highlight);
    }

    /* ===== 按钮体系 ===== */
    .btn-primary {
      background: var(--primary-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: none;
      cursor: pointer;
      box-shadow: var(--shadow-glow);
      transition: all 0.25s;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: #E04325;
      box-shadow: 0 0 24px rgba(255,77,46,0.8);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--cyan-highlight);
      color: var(--cyan-highlight);
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: all 0.25s;
    }
    .btn-secondary:hover {
      background: rgba(0, 229, 255, 0.08);
    }

    /* ===== Hero 首屏 ===== */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(255,77,46,0.15) 0%, var(--deep-black) 70%);
      overflow: hidden;
      margin-bottom: 0;
    }
    .hero::before {
      content: '';
      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;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--text-white);
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 40px;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .data-ring {
      width: 280px;
      height: 280px;
      border-radius: 50%;
      background: conic-gradient(var(--cyan-highlight) 0deg 200deg, var(--primary-orange) 200deg 360deg);
      filter: drop-shadow(0 0 35px rgba(0,229,255,0.5));
      display: flex;
      align-items: center;
      justify-content: center;
      animation: rotateRing 10s linear infinite;
    }
    .ring-inner {
      width: 200px;
      height: 200px;
      background: var(--deep-black);
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: white;
    }
    @keyframes rotateRing { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

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

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 30px;
    }
    .stat-card {
      background: var(--glass-bg);
      backdrop-filter: blur(var(--blur-amount));
      border-radius: var(--border-radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      text-align: center;
      border: 1px solid var(--divider);
      transition: all 0.3s;
    }
    .stat-card:hover {
      box-shadow: 0 12px 40px rgba(0,229,255,0.15);
      border-color: rgba(0,229,255,0.3);
    }
    .stat-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--cyan-highlight);
      font-feature-settings: "tnum";
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    /* 服务矩阵 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(var(--blur-amount));
      border-radius: var(--border-radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0,229,255,0.4);
      box-shadow: 0 12px 40px rgba(0,229,255,0.1);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: rgba(0,229,255,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--cyan-highlight);
      font-size: 24px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 12px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 对比区块 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .team-card {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--border-radius-card);
      padding: 28px;
      text-align: center;
    }
    .vs-circle {
      width: 60px;
      height: 60px;
      background: var(--cyan-highlight);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--deep-black);
      box-shadow: 0 0 25px rgba(0,229,255,0.6);
    }
    .progress-bar {
      height: 8px;
      background: var(--divider);
      border-radius: 4px;
      margin-top: 16px;
    }
    .progress-fill.orange { background: var(--primary-orange); width: 65%; height: 100%; border-radius: 4px; }
    .progress-fill.cyan { background: var(--cyan-highlight); width: 78%; height: 100%; border-radius: 4px; }

    /* 步骤条 */
    .steps-container {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--cyan-highlight);
      color: var(--deep-black);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 12px;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: 12px;
      padding: 18px 20px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: white;
    }
    .faq-answer {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 10px;
      display: none;
    }
    .faq-item.active .faq-answer { display: block; }

    /* CTA 区块 */
    .cta-section {
      background: var(--card-bg);
      text-align: center;
      padding: 80px 24px;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 30px auto 0;
      gap: 12px;
    }
    .cta-input {
      flex: 1;
      background: transparent;
      border: 1px solid var(--divider);
      border-radius: var(--border-radius-input);
      padding: 14px;
      color: white;
    }
    .cta-input:focus { border-color: var(--cyan-highlight); box-shadow: 0 0 10px rgba(0,229,255,0.3); }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    .copyright {
      border-top: 1px solid var(--divider);
      padding: 24px 0;
      text-align: center;
      color: var(--text-muted);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-bottom-nav { display: flex; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero h1 { font-size: 32px; }
      .dashboard-grid, .services-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .faq-grid { grid-template-columns: 1fr; }
      .steps-container { flex-direction: column; gap: 20px; }
      .cta-form { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }