/* roulang page: index */
:root {
      --primary: #059669;
      --primary-light: #00D084;
      --primary-dark: #047857;
      --accent: #FF6B00;
      --slate-900: #0F172A;
      --slate-800: #1E293B;
      --slate-700: #334155;
      --slate-600: #475569;
      --slate-100: #F1F5F9;
      --slate-50: #F8FAFC;
      --white: #FFFFFF;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.07);
      --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
      --transition: all 0.28s ease;
    }

    * { box-sizing: border-box; }
    body {
      font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--slate-800);
      background-color: var(--slate-50);
      margin: 0;
      padding: 0;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--slate-900);
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.02em;
      margin-top: 0;
    }

    p { margin-bottom: 1.25rem; }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-dark); }
    img { max-width: 100%; height: auto; display: block; }

    .site-header {
      position: sticky;
      top: 12px;
      z-index: 999;
      padding: 0 16px;
      margin-bottom: 20px;
    }
    .nav-island {
      max-width: 1200px;
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(226, 232, 240, 0.85);
      border-radius: var(--radius-full);
      box-shadow: var(--shadow-md);
      padding: 10px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.15rem;
      font-weight: 800;
      color: var(--slate-900);
    }
    .brand-icon-box {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: var(--white);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }
    .nav-links {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 22px;
      align-items: center;
    }
    .nav-links a {
      color: var(--slate-700);
      font-size: 0.92rem;
      font-weight: 600;
      padding: 6px 4px;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-pill {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: var(--white) !important;
      font-size: 0.88rem;
      font-weight: 600;
      padding: 9px 20px;
      border-radius: var(--radius-full);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.28);
      border: none;
      cursor: pointer;
    }
    .btn-pill:hover {
      background: linear-gradient(135deg, var(--primary-dark), #03543f);
      transform: translateY(-1px);
    }

    .main-section {
      padding: 72px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--white);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-dark {
      background-color: var(--slate-900);
      color: var(--white);
    }
    .section-dark h2, .section-dark h3, .section-dark h4 {
      color: var(--white);
    }
    .section-dark p {
      color: #94A3B8;
    }

    .section-header {
      margin-bottom: 48px;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      background: rgba(5, 150, 105, 0.08);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
    }
    .section-dark .section-tag {
      background: rgba(0, 208, 132, 0.16);
      color: var(--primary-light);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--slate-600);
      max-width: 760px;
      margin: 0 auto;
    }

    .hero-banner {
      padding: 56px 0 72px;
      background: linear-gradient(180deg, #F8FAFC 0%, #EEF2F6 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 44px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .hero-h1 {
      font-size: 2.6rem;
      line-height: 1.22;
      font-weight: 800;
      margin-bottom: 20px;
      color: var(--slate-900);
    }
    .hero-lead {
      font-size: 1.1rem;
      color: var(--slate-600);
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .check-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
      padding: 14px 18px;
      background: var(--slate-50);
      border-radius: var(--radius-md);
      border: 1px dashed #CBD5E1;
    }
    .check-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--slate-700);
    }
    .check-item i {
      color: var(--primary);
    }
    .hero-btn-group {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }
    .btn-secondary {
      background: var(--white);
      color: var(--slate-800);
      border: 1px solid var(--border-color);
      padding: 10px 22px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.92rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-secondary:hover {
      background: var(--slate-100);
      color: var(--slate-900);
    }

    .countdown-board {
      background: linear-gradient(90deg, var(--slate-900), var(--slate-800));
      border-radius: var(--radius-md);
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: var(--shadow-md);
      border: 1px solid #334155;
    }
    .countdown-label {
      color: var(--white);
      font-size: 1.05rem;
      font-weight: 700;
    }
    .countdown-slots {
      display: flex;
      gap: 12px;
      align-items: center;
    }
    .timer-badge {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 8px 14px;
      text-align: center;
      min-width: 68px;
    }
    .timer-num {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary-light);
      display: block;
      line-height: 1;
    }
    .timer-txt {
      font-size: 0.72rem;
      color: #94A3B8;
      display: block;
      margin-top: 4px;
    }

    .tech-card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .tech-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(5, 150, 105, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 20px;
    }
    .tech-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
    }
    .tech-card p {
      font-size: 0.92rem;
      color: var(--slate-600);
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .prod-card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .prod-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-light);
    }
    .prod-thumb {
      height: 220px;
      overflow: hidden;
      position: relative;
      background: var(--slate-100);
    }
    .prod-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .prod-card:hover .prod-thumb img {
      transform: scale(1.05);
    }
    .prod-body {
      padding: 26px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .prod-tag {
      font-size: 0.75rem;
      color: var(--accent);
      font-weight: 700;
      background: rgba(255, 107, 0, 0.1);
      padding: 3px 10px;
      border-radius: var(--radius-full);
      display: inline-block;
      align-self: flex-start;
      margin-bottom: 12px;
    }
    .spec-list {
      list-style: none;
      margin: 14px 0 20px;
      padding: 0;
      font-size: 0.88rem;
      color: var(--slate-600);
    }
    .spec-list li {
      padding: 5px 0;
      border-bottom: 1px dashed #EDF2F7;
      display: flex;
      justify-content: space-between;
    }
    .spec-list li span:first-child {
      color: var(--slate-500);
    }

    .metric-strip {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      border-radius: var(--radius-lg);
      padding: 44px 32px;
      color: var(--white);
      border: 1px solid #334155;
    }
    .metric-item {
      text-align: center;
      padding: 10px 16px;
    }
    .metric-val {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary-light);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-tit {
      font-size: 1rem;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 4px;
    }
    .metric-desc {
      font-size: 0.82rem;
      color: #94A3B8;
      margin-bottom: 0;
    }

    .step-track {
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 24px;
      flex-wrap: wrap;
      gap: 20px;
    }
    .step-node {
      flex: 1;
      min-width: 180px;
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-idx {
      width: 32px;
      height: 32px;
      border-radius: var(--radius-full);
      background: var(--primary);
      color: var(--white);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }
    .step-node h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .step-node p {
      font-size: 0.86rem;
      color: var(--slate-600);
      margin: 0;
    }

    .quote-card {
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      height: 100%;
      box-shadow: var(--shadow-sm);
    }
    .quote-stars {
      color: #F59E0B;
      font-size: 0.88rem;
      margin-bottom: 14px;
    }
    .quote-text {
      font-size: 0.94rem;
      color: var(--slate-700);
      font-style: normal;
      margin-bottom: 20px;
    }
    .quote-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-full);
      background: var(--slate-100);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      border: 1px solid var(--border-color);
    }
    .user-info strong {
      display: block;
      font-size: 0.92rem;
      color: var(--slate-900);
    }
    .user-info span {
      display: block;
      font-size: 0.78rem;
      color: var(--slate-500);
    }

    .form-wrapper {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-lg);
    }
    .custom-input {
      width: 100%;
      height: 46px;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      background: var(--slate-50);
      color: var(--slate-800);
      font-size: 0.94rem;
      margin-bottom: 16px;
      transition: var(--transition);
    }
    .custom-input:focus {
      outline: none;
      border-color: var(--primary);
      background: var(--white);
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
    }
    .custom-select {
      width: 100%;
      height: 46px;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      background: var(--slate-50);
      color: var(--slate-800);
      font-size: 0.94rem;
      margin-bottom: 16px;
    }

    .site-footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 64px 0 24px;
      border-top: 1px solid #1E293B;
      font-size: 0.88rem;
    }
    .site-footer h4 {
      color: var(--white);
      font-size: 1.05rem;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: var(--primary-light);
    }
    .footer-bottom {
      margin-top: 48px;
      padding-top: 24px;
      border-top: 1px solid #1E293B;
      text-align: center;
      font-size: 0.82rem;
      color: #64748B;
    }

    @media (max-width: 1024px) {
      .hero-h1 { font-size: 2.2rem; }
      .section-title { font-size: 1.8rem; }
      .nav-island { padding: 8px 16px; }
      .nav-links { gap: 12px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hero-card { padding: 24px; }
      .hero-h1 { font-size: 1.75rem; }
      .countdown-board { flex-direction: column; align-items: flex-start; }
      .step-track { flex-direction: column; }
      .form-wrapper { padding: 24px; }
      .metric-val { font-size: 2.2rem; }
    }