/* roulang page: index */
:root {
      --primary-purple: #7B2FFF;
      --primary-purple-dark: #6928d9;
      --accent-cyan: #00E5A0;
      --accent-cyan-dark: #00c87f;
      --deep-black: #0B0C10;
      --dark-surface: #1A1A1F;
      --warm-gold: #F5B042;
      --bg-light: #F8F9FC;
      --text-primary: #1E1E24;
      --text-secondary: #5A5A6E;
      --border-light: #E0E0E0;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 28px rgba(123,47,255,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-data: "Inter", "Rajdhani", sans-serif;
      --transition-base: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.8;
      margin: 0;
      padding: 0;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      margin-top: 0;
    }

    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--deep-black);
    }

    h2 {
      font-size: 2.4rem;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }

    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    .site-header {
      background: var(--white);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 40;
      backdrop-filter: blur(6px);
      background: rgba(255,255,255,0.92);
      border-bottom: 1px solid rgba(123,47,255,0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary-purple);
    }

    .logo-text {
      font-family: 'Rajdhani', var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary-purple);
      letter-spacing: -0.3px;
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 1rem;
      text-decoration: none;
      position: relative;
      padding: 0.25rem 0;
      transition: color var(--transition-base);
    }

    .nav-links a:after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: -4px;
      left: 0;
      background: var(--primary-purple);
      transition: width var(--transition-base);
    }

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

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: var(--bg-light);
      border-radius: 30px;
      padding: 0.4rem 1rem;
      border: 1px solid var(--border-light);
      transition: border var(--transition-base);
    }

    .search-box i {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    .search-box input {
      border: none;
      background: transparent;
      padding: 0.3rem 0.5rem;
      width: 130px;
      outline: none;
      font-size: 0.9rem;
    }

    .search-box:focus-within {
      border-color: var(--primary-purple);
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: var(--white);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      border: none;
      cursor: pointer;
      transition: all var(--transition-base);
      display: inline-block;
      text-decoration: none;
      font-size: 0.95rem;
    }

    .btn-primary:hover {
      background: var(--accent-cyan-dark);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(0,229,160,0.3);
      color: var(--white);
      text-decoration: none;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-purple);
      color: var(--primary-purple);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      transition: all var(--transition-base);
      display: inline-block;
      text-decoration: none;
    }

    .btn-outline:hover {
      background: var(--primary-purple);
      color: var(--white);
      text-decoration: none;
    }

    .btn-ghost {
      border: 2px solid var(--white);
      color: var(--white);
      background: transparent;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 2rem;
    }

    .btn-ghost:hover {
      background: var(--white);
      color: var(--deep-black);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-primary);
    }

    /* 区块通用 */
    section {
      padding: 5rem 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 2.5rem;
    }

    /* Hero */
    #hero {
      padding: 3rem 0 5rem;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      text-align: center;
    }

    .hero-right img {
      max-width: 100%;
      border-radius: 20px;
      box-shadow: 0 25px 45px rgba(123,47,255,0.15);
      animation: float 4s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }

    .hero-stats {
      display: flex;
      gap: 2.5rem;
      margin-top: 2.5rem;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: 'Rajdhani', sans-serif;
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-cyan);
      line-height: 1.2;
    }

    /* 卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(123,47,255,0.2);
    }

    .dark-card {
      background: var(--dark-surface);
      color: var(--white);
      border-radius: var(--radius-card);
    }

    /* 优势网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.8rem;
    }

    .advantage-row {
      display: flex;
      gap: 1.8rem;
    }

    .adv-card {
      padding: 2rem;
      display: flex;
      flex-direction: column;
    }

    .adv-icon {
      font-size: 2.4rem;
      color: var(--accent-cyan);
      margin-bottom: 1rem;
    }

    .adv-card.wide {
      flex: 6;
    }

    .adv-card.narrow {
      flex: 4;
    }

    /* 服务瀑布 */
    .services-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .service-card.tall img {
      height: 280px;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .case-tag {
      background: transparent;
      border: 1px solid var(--primary-purple);
      color: var(--primary-purple);
      font-size: 0.8rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
    }

    /* FAQ */
    .accordion-item {
      background: var(--white);
      border-radius: 10px;
      margin-bottom: 1rem;
      border: 1px solid #eee;
    }

    .accordion-title {
      font-weight: 600;
      padding: 1.2rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }

    .accordion-content {
      padding: 0 1.2rem 1.2rem;
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    .accordion-item.active {
      background: #f5edff;
    }

    /* CTA */
    .cta-block {
      background: var(--deep-black);
      background-image: radial-gradient(circle at 30% 40%, rgba(123,47,255,0.2) 0%, transparent 35%);
    }

    /* 联系 */
    .contact-grid {
      display: flex;
      gap: 3rem;
    }

    .contact-info i {
      color: var(--accent-cyan);
      width: 22px;
    }

    .form-input {
      border-radius: 8px;
      border: 1px solid var(--border-light);
      padding: 0.8rem;
      width: 100%;
    }

    .form-input:focus {
      border-color: var(--primary-purple);
      outline: none;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .services-masonry { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box { display: none; }
      .hamburger { display: block; }
      .services-masonry, .cases-grid { grid-template-columns: 1fr; }
      .advantage-row { flex-direction: column; }
      .contact-grid { flex-direction: column; }
      h1 { font-size: 2.2rem; }
      .hero-stats { flex-wrap: wrap; }
    }