/* roulang page: index */
:root {
      --primary-purple: #6C3CFC;
      --primary-purple-deep: #4B20B3;
      --accent-orange: #FF6B2B;
      --dark-indigo: #1E1B4B;
      --bg-light: #F8F7FF;
      --card-white: #FFFFFF;
      --text-dark: #2D2A3A;
      --text-muted: #6B6780;
      --border-light: #E8E6F0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.05);
      --shadow-hover: 0 12px 32px rgba(108,60,252,0.12);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-pill: 20px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.2;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 自定义导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, box-shadow 0.3s;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(108,60,252,0.1);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      padding: 0;
    }
    .navbar-scrolled {
      background: rgba(30,27,75,0.95) !important;
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .navbar-scrolled .nav-link,
    .navbar-scrolled .navbar-brand {
      color: white !important;
    }
    .navbar-scrolled .btn-outline-purple {
      border-color: white;
      color: white;
    }
    .navbar-scrolled .btn-primary-purple {
      background: var(--accent-orange);
      border-color: var(--accent-orange);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--dark-indigo);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      height: 38px;
      width: auto;
    }
    .nav-link {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-dark);
      margin: 0 0.25rem;
      padding: 0.5rem 0.8rem !important;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary-purple);
    }
    .btn-primary-purple {
      background: var(--primary-purple);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
    }
    .btn-primary-purple:hover {
      background: var(--primary-purple-deep);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(108,60,252,0.3);
      color: white;
    }
    .btn-outline-purple {
      border: 2px solid var(--primary-purple);
      background: transparent;
      color: var(--primary-purple);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
    }
    .btn-outline-purple:hover {
      background: rgba(108,60,252,0.06);
      border-color: var(--primary-purple-deep);
      color: var(--primary-purple-deep);
    }
    /* Hero 杂志双栏 */
    .hero-section {
      padding: 140px 0 100px;
      background: var(--bg-light);
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--dark-indigo);
    }
    .hero-title span {
      background: linear-gradient(135deg, #6C3CFC, #FF6B2B);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--text-muted);
      margin: 1.2rem 0;
    }
    .hero-desc {
      font-size: 1rem;
      color: #4a4a4a;
      max-width: 480px;
    }
    .hero-image-col {
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-image-col img {
      border-radius: 24px;
      box-shadow: 0 25px 45px rgba(108,60,252,0.18);
      width: 100%;
      height: auto;
    }
    /* 区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    /* 卡片通用 */
    .feature-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border: none;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.6rem;
      color: var(--primary-purple);
      margin-bottom: 1.2rem;
    }
    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      margin-bottom: 24px;
      break-inside: avoid;
    }
    .case-card:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-hover);
    }
    .case-card img {
      width: 100%;
      height: auto;
      display: block;
    }
    .case-info {
      padding: 1.2rem;
    }
    .badge-purple {
      background: rgba(108,60,252,0.1);
      color: var(--primary-purple);
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 0.75rem;
      font-weight: 600;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
      position: relative;
      border: 1px solid var(--border-light);
    }
    .solution-card.popular {
      border: 2px solid var(--primary-purple);
      box-shadow: 0 0 0 2px #6C3CFC, 0 12px 28px rgba(108,60,252,0.18);
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent-orange);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--primary-purple);
      box-shadow: none;
      border-left: 4px solid var(--primary-purple);
    }
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      background: white;
      border: none;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .cta-section {
      background: linear-gradient(135deg, #1E1B4B 0%, #6C3CFC 100%);
      padding: 4rem 0;
      border-radius: 0;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .cta-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 0%, transparent 40%);
      pointer-events: none;
    }
    .footer-custom {
      background: #1E1B4B;
      color: #ddd;
      padding: 3rem 0 1.5rem;
    }
    .footer-custom a {
      color: #ccc;
    }
    .footer-custom a:hover {
      color: var(--accent-orange);
    }
    .social-icon {
      font-size: 1.4rem;
      margin-right: 15px;
      color: #aaa;
      transition: 0.2s;
    }
    .social-icon:hover {
      color: var(--accent-orange);
      transform: scale(1.15);
    }
    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .navbar-brand { font-size: 1.4rem; }
    }
    @media (max-width: 768px) {
      .hero-section { padding: 120px 0 60px; }
      .hero-title { font-size: 1.9rem; }
    }
    @media (max-width: 576px) {
      .container { padding: 0 16px; }
      .btn-primary-purple, .btn-outline-purple { padding: 8px 18px; font-size: 0.9rem; }
    }