/* roulang page: index */
:root {
      --primary: #E9402B;
      --primary-dark: #C6281E;
      --secondary: #1A1A2E;
      --accent: #00D2A0;
      --bg-light: #FAFAFA;
      --card-bg: #FFFFFF;
      --gray-bg: #F0F2F5;
      --text-primary: #1A1A2E;
      --text-secondary: #5A5A6E;
      --text-on-dark: #FFFFFF;
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(26, 26, 46, 0.06);
      --shadow-hover: 0 12px 32px rgba(233, 64, 43, 0.12);
      --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航样式 */
    .navbar-custom {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      padding: 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      font-size: 2rem;
      color: var(--primary);
    }
    .nav-pills-custom .nav-link {
      color: var(--text-primary);
      background: transparent;
      border-radius: 20px;
      padding: 6px 18px;
      margin: 0 2px;
      font-weight: 500;
      transition: var(--transition-base);
    }
    .nav-pills-custom .nav-link.active,
    .nav-pills-custom .nav-link:hover {
      background: var(--primary);
      color: white;
    }
    .channel-tabs-row {
      background: rgba(250,250,250,0.7);
      backdrop-filter: blur(6px);
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
      padding: 8px 0;
    }
    .channel-tabs-row::-webkit-scrollbar {
      display: none;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
      box-shadow: 0 4px 10px rgba(233,64,43,0.2);
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
      color: white;
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
    }
    .btn-outline-custom:hover {
      background: rgba(233,64,43,0.05);
      color: var(--primary);
      transform: scale(1.02);
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #FAFAFA 100%);
      padding: 3rem 0 4rem;
    }
    .hero-data-number {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--accent);
      margin-right: 4px;
      font-family: 'Roboto', sans-serif;
    }
    /* 卡片 */
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--border-radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      border: none;
      height: 100%;
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(233,64,43,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.2rem;
      color: var(--primary);
      font-size: 2rem;
    }
    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    @media (max-width: 992px) {
      .masonry-grid { column-count: 2; }
    }
    @media (max-width: 768px) {
      .masonry-grid { column-count: 1; }
    }
    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      height: auto;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(26,26,46,0.7);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      font-weight: 600;
      font-size: 1.2rem;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    /* 方案对比表 */
    .plan-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      border: 2px solid transparent;
      height: 100%;
    }
    .plan-card.recommended {
      border-color: var(--primary);
      background: #FFF9F8;
      position: relative;
      transform: scale(1.02);
    }
    .badge-popular {
      background: var(--primary);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      font-weight: 600;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: rgba(233,64,43,0.04);
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 0.2rem rgba(0,210,160,0.25);
    }
    /* 联系表单 */
    .contact-dark {
      background: var(--secondary);
      color: white;
      border-radius: 24px;
      padding: 2.5rem;
    }
    .form-control-custom {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      border-radius: 8px;
      padding: 12px 16px;
    }
    .form-control-custom:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 0.2rem rgba(0,210,160,0.3);
      background: rgba(255,255,255,0.15);
      color: white;
    }
    .footer-dark {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
    }
    @media (max-width: 768px) {
      .hero-left { text-align: center; margin-bottom: 2rem; }
      .plan-card.recommended { transform: none; }
    }