/* roulang page: index */
:root {
      --primary-blue: #0d6efd;
      --navy-dark: #0a192f;
      --navy-light: #172a45;
      --accent-cyan: #0dcaf0;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-subtle: 0 4px 20px rgba(13, 110, 253, 0.06);
      --shadow-hover: 0 12px 30px rgba(13, 110, 253, 0.12);
      --transition-base: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

    /* 顶部导航 */
    .site-nav {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1020;
    }

    .brand-logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--navy-dark);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand-logo i {
      color: var(--primary-blue);
      font-size: 1.5rem;
    }

    .nav-link-custom {
      color: var(--text-main);
      font-weight: 500;
      padding: 0.5rem 1rem;
      border-radius: var(--radius-sm);
    }

    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--primary-blue);
      background: rgba(13, 110, 253, 0.05);
    }

    /* 蓝图 Hero：短视频竖屏感主视觉 + 跟买/了解 CTA */
    .hero-section {
      position: relative;
      background: linear-gradient(135deg, #0a192f 0%, #1e3a8a 100%);
      color: #ffffff;
      padding: 80px 0 60px;
      overflow: hidden;
    }

    .hero-bg-overlay {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      mix-blend-mode: overlay;
    }

    .hero-content-wrapper {
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(13, 202, 240, 0.15);
      border: 1px solid rgba(13, 202, 240, 0.3);
      color: var(--accent-cyan);
      border-radius: 30px;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-lead {
      font-size: 1.125rem;
      color: #cbd5e1;
      margin-bottom: 30px;
      max-width: 620px;
      line-height: 1.7;
    }

    /* 竖屏视频质感卡片 */
    .vertical-player-mockup {
      width: 100%;
      max-width: 320px;
      margin: 0 auto;
      background: #000;
      border-radius: 28px;
      border: 6px solid #2d3748;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
      position: relative;
      overflow: hidden;
      aspect-ratio: 9 / 16;
    }

    .vertical-player-mockup img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .player-overlay-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(0, 0, 0, 0.65);
      backdrop-filter: blur(4px);
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.75rem;
      font-weight: 600;
      color: #fff;
    }

    .player-controls-bottom {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 16px;
      background: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, transparent 100%);
      color: #fff;
    }

    .video-progress-bar {
      height: 3px;
      background: rgba(255, 255, 255, 0.3);
      border-radius: 2px;
      margin-bottom: 10px;
      position: relative;
    }

    .video-progress-fill {
      width: 68%;
      height: 100%;
      background: var(--accent-cyan);
      border-radius: 2px;
    }

    /* 章节与区块统一风格 */
    .section-padding {
      padding: 70px 0;
    }

    .section-title-wrap {
      margin-bottom: 45px;
    }

    .section-eyebrow {
      color: var(--primary-blue);
      font-weight: 700;
      font-size: 0.875rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-heading {
      font-size: 2rem;
      font-weight: 800;
      color: var(--navy-dark);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

    .section-subtext {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 650px;
      margin: 0 auto;
    }

    /* 现代卡片系统 */
    .content-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-subtle);
      transition: var(--transition-base);
      height: 100%;
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    .content-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(13, 110, 253, 0.3);
    }

    .card-img-holder {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16 / 9;
    }

    .card-img-holder img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .content-card:hover .card-img-holder img {
      transform: scale(1.04);
    }

    .tag-badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: rgba(10, 25, 47, 0.85);
      backdrop-filter: blur(4px);
      color: #fff;
      font-size: 0.75rem;
      padding: 4px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    .card-body-custom {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    /* 按钮与交互 */
    .btn-main {
      background: var(--primary-blue);
      color: #fff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      border: none;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-main:hover {
      background: #0b5ed7;
      color: #fff;
      box-shadow: 0 4px 14px rgba(13, 110, 253, 0.35);
    }

    .btn-outline-custom {
      background: transparent;
      color: #ffffff;
      border: 1px solid rgba(255, 255, 255, 0.4);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      transition: var(--transition-base);
    }

    .btn-outline-custom:hover {
      background: rgba(255, 255, 255, 0.1);
      color: #fff;
      border-color: #fff;
    }

    /* 数据指标条 */
    .metric-counter {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--primary-blue);
      line-height: 1;
      margin-bottom: 8px;
    }

    /* 步骤时间轴 */
    .step-badge {
      width: 42px;
      height: 42px;
      background: var(--primary-blue);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    /* 对比表格风格卡片 */
    .compare-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 2px solid #e2e8f0;
      padding: 24px;
      position: relative;
    }

    .compare-card.featured {
      border-color: var(--primary-blue);
      box-shadow: var(--shadow-hover);
    }

    .compare-ribbon {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--primary-blue);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--navy-dark);
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }

    .footer-brand {
      color: #fff;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .section-heading {
        font-size: 1.6rem;
      }
      .section-padding {
        padding: 50px 0;
      }
    }