/* roulang page: index */
:root {
      --primary: #e61c47;
      --primary-hover: #c41238;
      --primary-soft: rgba(230, 28, 71, 0.08);
      --dark-base: #0f1015;
      --dark-card: #171821;
      --dark-border: #262938;
      --text-main: #f0f2f5;
      --text-muted: #9aa1b2;
      --accent: #ff476f;
      --light-bg: #13141c;
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--dark-base);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent);
    }
    .top-navbar {
      background: rgba(15, 16, 21, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--dark-border);
      position: sticky;
      top: 0;
      z-index: 999;
      padding: 0.85rem 0;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #fff;
    }
    .brand-logo i {
      color: var(--primary);
      font-size: 1.5rem;
    }
    .nav-links a {
      font-weight: 500;
      padding: 0.5rem 1rem;
      border-radius: 6px;
      color: var(--text-muted);
    }
    .nav-links a.active, .nav-links a:hover {
      color: #fff;
      background: var(--primary-soft);
    }
    .btn-action {
      background: var(--primary);
      color: #fff;
      font-weight: 600;
      padding: 0.65rem 1.4rem;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid var(--primary);
      box-shadow: 0 4px 16px rgba(230, 28, 71, 0.35);
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-action:hover {
      background: var(--primary-hover);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(230, 28, 71, 0.5);
    }
    .btn-outline {
      background: transparent;
      color: #fff;
      font-weight: 600;
      padding: 0.65rem 1.4rem;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid var(--dark-border);
      transition: var(--transition);
    }
    .btn-outline:hover {
      border-color: var(--accent);
      color: #fff;
      background: rgba(255, 71, 111, 0.08);
    }
    .site-section {
      padding: 5rem 0;
      border-bottom: 1px solid var(--dark-border);
      position: relative;
    }
    .site-section.bg-alt {
      background-color: var(--light-bg);
    }
    .section-header {
      margin-bottom: 3.5rem;
      text-align: center;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.78rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--accent);
      background: rgba(255, 71, 111, 0.12);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 1rem;
      border: 1px solid rgba(255, 71, 111, 0.2);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #fff;
      letter-spacing: -0.5px;
      line-height: 1.3;
      margin-bottom: 0.8rem;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
      line-height: 1.7;
    }
    .hero-banner {
      background: linear-gradient(180deg, rgba(15,16,21,0.85) 0%, rgba(15,16,21,0.95) 100%), url('/assets/images/887b1896bfaabbc7.webp') center/cover no-repeat;
      padding: 6.5rem 0 5.5rem;
      position: relative;
    }
    .hero-trial-card {
      background: rgba(23, 24, 33, 0.85);
      border: 1px solid var(--dark-border);
      border-radius: var(--radius);
      padding: 2.5rem;
      box-shadow: 0 20px 40px rgba(0,0,0,0.45);
      backdrop-filter: blur(10px);
    }
    .card-dark {
      background: var(--dark-card);
      border: 1px solid var(--dark-border);
      border-radius: var(--radius);
      padding: 2rem;
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .card-dark:hover {
      border-color: rgba(230, 28, 71, 0.4);
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.5);
    }
    .pain-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      opacity: 0.8;
      margin-bottom: 1rem;
    }
    .thumb-wrap {
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 1.25rem;
      position: relative;
      aspect-ratio: 16/9;
    }
    .thumb-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .card-dark:hover .thumb-wrap img {
      transform: scale(1.05);
    }
    .track-badge {
      position: absolute;
      top: 10px;
      right: 10px;
      background: rgba(0,0,0,0.75);
      color: #fff;
      font-size: 0.72rem;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
      backdrop-filter: blur(4px);
    }
    .metric-box {
      border-left: 3px solid var(--primary);
      padding-left: 1.25rem;
      margin-bottom: 1.5rem;
    }
    .metric-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: #fff;
      line-height: 1;
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 0.4rem;
    }
    .custom-input {
      background: #0f1015;
      border: 1px solid var(--dark-border);
      color: #fff;
      padding: 0.75rem 1.2rem;
      border-radius: 8px;
      font-size: 0.95rem;
      width: 100%;
      margin-bottom: 1rem;
    }
    .custom-input:focus {
      border-color: var(--accent);
      outline: none;
      background: #14151e;
    }
    .price-box {
      border: 1px solid var(--dark-border);
      border-radius: var(--radius);
      padding: 2.2rem 1.8rem;
      background: var(--dark-card);
      text-align: center;
      transition: var(--transition);
    }
    .price-box.popular {
      border-color: var(--primary);
      position: relative;
      background: linear-gradient(180deg, rgba(230, 28, 71, 0.05) 0%, var(--dark-card) 100%);
    }
    .popular-tag {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #fff;
      font-size: 0.72rem;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 20px;
    }
    .site-footer {
      background: #0a0a0d;
      border-top: 1px solid var(--dark-border);
      padding: 4rem 0 2rem;
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .footer-col h5 {
      color: #fff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 1.2rem;
    }
    .footer-col ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-col ul li {
      margin-bottom: 0.6rem;
    }
    .badge-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-soft);
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      margin-bottom: 1.2rem;
    }
    @media (max-width: 768px) {
      .section-title { font-size: 1.6rem; }
      .site-section { padding: 3.5rem 0; }
      .hero-banner { padding: 4rem 0 3.5rem; }
    }