/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D03D18;
      --secondary-dark: #1A1D23;
      --secondary-purple: #8B3FEE;
      --accent-green: #00E5A0;
      --gray-bg: #F5F6F8;
      --white: #FFFFFF;
      --gray-text: #6B7280;
      --light-gray: #B0B3B8;
      --footer-bg: #111318;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 36px rgba(240,78,35,0.15);
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      line-height: 1.75;
      color: var(--secondary-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: none;
      transition: var(--transition);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--white);
      border-bottom: 1px solid transparent;
      transition: var(--transition);
    }
    #nav.scrolled {
      box-shadow: 0 2px 16px rgba(0,0,0,0.06);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-menu a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--secondary-dark);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: var(--white);
      padding: 8px 20px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      margin-left: 16px;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--secondary-dark);
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 18px;
      }
      .nav-menu a {
        font-size: 0.85rem;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 32px 32px;
        gap: 24px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        box-shadow: -4px 0 20px rgba(0,0,0,0.2);
      }
      .nav-menu.open {
        transform: translateX(0);
      }
      .nav-menu a {
        color: white;
        font-size: 1.2rem;
        border-bottom: none;
      }
      .nav-menu a.active {
        border-bottom: 2px solid white;
      }
      .nav-cta {
        margin-left: 0;
        background: white;
        color: var(--primary);
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #1A1D23 0%, #0D0F12 100%);
      color: white;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: repeating-linear-gradient(45deg, rgba(139,63,238,0.08) 0px, rgba(139,63,238,0.08) 2px, transparent 2px, transparent 12px);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      background: linear-gradient(to right, #F04E23, #FF6B4A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .hero-text p {
      font-size: 1.1rem;
      color: #B0B3B8;
      margin-bottom: 32px;
      max-width: 450px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      box-shadow: 0 8px 20px rgba(240,78,35,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(240,78,35,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hero-image {
      background: rgba(255,255,255,0.05);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(139,63,238,0.3);
      box-shadow: 0 0 30px rgba(139,63,238,0.2);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      .hero-text p {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--secondary-dark);
      margin-bottom: 8px;
    }
    .section-title p {
      color: var(--gray-text);
      max-width: 600px;
      margin: 0 auto;
    }
    .bg-gray {
      background: var(--gray-bg);
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 20px;
      color: var(--secondary-purple);
    }
    .feature-card h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 产品功能 */
    .product-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .product-block.reverse {
      direction: rtl;
    }
    .product-block.reverse .product-content {
      direction: ltr;
    }
    .product-content h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
    }
    .product-content p {
      color: var(--gray-text);
      margin-bottom: 20px;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
      font-size: 0.95rem;
    }
    .feature-list li::before {
      content: "✓";
      color: var(--accent-green);
      font-weight: bold;
    }
    .product-image {
      background: #f0f0f0;
      border-radius: var(--radius-lg);
      overflow: hidden;
      height: 320px;
    }
    .product-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .product-block, .product-block.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
      }
      .product-image {
        height: 240px;
      }
    }
    /* 场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .scenario-card:hover .scenario-img {
      transform: scale(1.03);
      filter: brightness(0.9);
    }
    .scenario-img {
      height: 200px;
      background: #ddd;
      transition: var(--transition);
    }
    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scenario-info {
      padding: 20px;
    }
    .scenario-info h3 {
      margin-bottom: 6px;
    }
    .tag {
      display: inline-block;
      background: rgba(139,63,238,0.1);
      color: var(--secondary-purple);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .scenarios-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: var(--secondary-dark);
      color: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .case-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-green);
      border-bottom: 3px solid var(--primary);
      padding-bottom: 4px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .case-card {
        flex-direction: column;
        text-align: center;
      }
    }
    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
      border: 1px solid var(--border-light);
      transition: var(--transition);
      position: relative;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 8px 30px rgba(240,78,35,0.2);
    }
    .badge {
      background: var(--secondary-purple);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      margin: 16px 0;
    }
    .pricing-card ul {
      list-style: none;
      margin: 20px 0;
      text-align: left;
    }
    .pricing-card li {
      margin: 8px 0;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--gray-text);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 8px;
    }
    /* CTA */
    #cta {
      background: var(--secondary-dark);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .btn-ghost {
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-md);
    }
    /* Footer */
    #footer {
      background: var(--footer-bg);
      color: #aaa;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }