/* roulang page: index */
:root {
      --primary: #FF6B2C;
      --primary-dark: #E55A1F;
      --accent: #00E5A0;
      --bg-deep: #0F0F14;
      --bg-card: #1A1A22;
      --bg-input: #242430;
      --text-white: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #707080;
      --border: #2A2A38;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 24px rgba(255,107,44,0.06);
      --shadow-hover: 0 12px 36px rgba(255,107,44,0.18);
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .site-header.scrolled {
      background: rgba(15, 15, 20, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 0 rgba(255,107,44,0.3);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 800;
      color: #fff;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .nav-links a {
      color: #ddd;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

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

    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(255,107,44,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(255,107,44,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      transition: all 0.25s ease;
    }

    .btn-outline:hover {
      background: rgba(255,107,44,0.1);
      border-color: #ff8c5a;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: #fff;
      transition: 0.2s;
    }

    /* 移动端导航面板 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(15, 15, 20, 0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      transform: translateY(-100%);
      transition: transform 0.35s ease;
      z-index: 999;
    }

    .mobile-menu.open {
      transform: translateY(0);
    }

    .mobile-menu a {
      font-size: 24px;
      color: #fff;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      min-height: 100vh;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-title {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(135deg, #FF6B2C, #FF9A5C);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: #B0B0C0;
      margin-bottom: 36px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      clip-path: polygon(8% 0, 100% 0, 100% 100%, 0% 100%);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(255,107,44,0.25), transparent 70%);
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 48px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }

    /* 亮点网格 不等高 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: all 0.25s ease;
      position: relative;
    }

    .feature-card:hover {
      border-color: var(--primary);
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 12px;
    }

    /* 产品图文交替 */
    .product-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 80px;
      align-items: center;
      margin-bottom: 100px;
    }

    .product-img img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }

    .product-text h2 {
      font-size: 36px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
    }

    .text-link {
      color: var(--accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: 0.2s;
    }

    .text-link:hover {
      transform: translateX(4px);
      text-decoration: underline;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      margin-top: 48px;
    }

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

    .step-circle {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 2px dashed var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      margin: 0 auto 16px;
      transition: 0.3s;
    }

    .step:hover .step-circle {
      border-style: solid;
      border-color: var(--primary);
      background: #2a1f1a;
    }

    /* 案例瀑布流 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }

    .case-card {
      background: var(--bg-card);
      border-radius: 12px;
      overflow: hidden;
      transition: 0.3s;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .case-img img {
      aspect-ratio: 16/10;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .case-card:hover .case-img img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .stat-highlight {
      color: var(--accent);
      font-weight: 800;
      font-size: 20px;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }

    .compare-col {
      background: var(--bg-card);
      border-radius: 16px;
      padding: 32px;
    }

    .compare-col h3 {
      font-size: 24px;
      color: #fff;
      margin-bottom: 20px;
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: 10px;
      margin-bottom: 12px;
      padding: 18px 24px;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }

    .faq-item.active {
      border-left-color: var(--primary);
    }

    .faq-question {
      font-weight: 700;
      color: #fff;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #B0B0C0;
      margin-top: 12px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1e1e2a, #0f0f14);
      border-radius: 28px;
      padding: 72px 32px;
      text-align: center;
      border: 1px solid var(--border);
    }

    .pulse-btn {
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,107,44,0.6); }
      70% { box-shadow: 0 0 0 16px rgba(255,107,44,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,107,44,0); }
    }

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

    .copyright {
      border-top: 1px solid var(--border);
      padding-top: 24px;
      margin-top: 40px;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero-grid, .product-row {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .features-grid, .cases-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-title { font-size: 36px; }
      .section-title { font-size: 28px; }
      .features-grid, .cases-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 30px; }
      .compare-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }