/* roulang page: index */
:root {
      --bg: #f4f8fc;
      --bg-soft: #eef4fb;
      --surface: #ffffff;
      --surface-soft: #f9fbfe;
      --ink: #15233d;
      --muted: #5d6b84;
      --faint: #8090a7;
      --primary: #2f6bff;
      --primary-deep: #1f55d7;
      --primary-soft: #eaf1ff;
      --accent: #12b5b0;
      --accent-soft: #e8fbfa;
      --warm: #f2a65a;
      --border: #d7e2f0;
      --border-strong: #bfcde0;
      --shadow: 0 18px 42px rgba(27, 52, 92, 0.10);
      --shadow-soft: 0 10px 26px rgba(27, 52, 92, 0.08);
      --radius: 8px;
      --radius-sm: 6px;
      --space-xs: 8px;
      --space-sm: 12px;
      --space-md: 20px;
      --space-lg: 28px;
      --space-xl: 40px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      color: var(--ink);
      background:
        linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(244,248,252,1) 16%, rgba(244,248,252,1) 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    a:hover {
      color: inherit;
    }

    img {
      max-width: 100%;
      display: block;
    }

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

    .page-shell {
      position: relative;
      overflow: clip;
    }

    .site-header {
      position: sticky;
      top: 12px;
      z-index: 1030;
      padding: 0 0 10px;
    }

    .site-nav-shell {
      background: rgba(255, 255, 255, 0.90);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(215, 226, 240, 0.95);
      border-radius: 999px;
      box-shadow: var(--shadow-soft);
      padding: 10px 14px;
    }

    .brand-mark {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      letter-spacing: 0;
      color: var(--ink);
      white-space: nowrap;
    }

    .brand-badge {
      width: 36px;
      height: 36px;
      border-radius: 999px;
      background: linear-gradient(135deg, var(--primary) 0%, #5e86ff 100%);
      color: #fff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 12px 22px rgba(47, 107, 255, 0.25);
      flex: 0 0 auto;
    }

    .brand-name {
      font-size: 1rem;
      line-height: 1.2;
    }

    .brand-sub {
      font-size: .78rem;
      color: var(--muted);
      font-weight: 600;
    }

    .navbar .nav-link {
      color: var(--muted);
      font-weight: 700;
      border-radius: 999px;
      padding: 8px 16px;
      transition: all .2s ease;
      white-space: nowrap;
    }

    .navbar .nav-link:hover,
    .navbar .nav-link:focus {
      color: var(--primary-deep);
      background: var(--primary-soft);
    }

    .navbar .nav-link.active,
    .navbar .nav-link[aria-current="page"] {
      color: #fff;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
      box-shadow: 0 10px 20px rgba(47, 107, 255, 0.22);
    }

    .navbar-toggler {
      border: 1px solid var(--border);
      border-radius: 999px;
      box-shadow: none !important;
    }

    .navbar-toggler:focus {
      box-shadow: 0 0 0 0.2rem rgba(47, 107, 255, 0.16) !important;
    }

    .hero-section {
      padding: 44px 0 28px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 12px;
      border: 1px solid rgba(47, 107, 255, 0.14);
      background: rgba(234, 241, 255, 0.84);
      color: var(--primary-deep);
      border-radius: 999px;
      font-weight: 700;
      font-size: .92rem;
    }

    .hero-title {
      margin: 18px 0 14px;
      font-size: 3rem;
      line-height: 1.08;
      font-weight: 900;
      letter-spacing: 0;
    }

    .hero-desc {
      color: var(--muted);
      font-size: 1.06rem;
      max-width: 42rem;
      margin-bottom: 24px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      margin-bottom: 22px;
    }

    .btn {
      border-radius: 999px;
      padding: 0.8rem 1.15rem;
      font-weight: 700;
      transition: all .2s ease;
      border-width: 1px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
      border-color: transparent;
      box-shadow: 0 14px 28px rgba(47, 107, 255, 0.20);
    }

    .btn-primary:hover,
    .btn-primary:focus {
      background: linear-gradient(135deg, var(--primary-deep) 0%, #1747c4 100%);
      transform: translateY(-1px);
      box-shadow: 0 18px 32px rgba(47, 107, 255, 0.24);
    }

    .btn-outline-primary {
      color: var(--primary-deep);
      border-color: rgba(47, 107, 255, 0.26);
      background: #fff;
    }

    .btn-outline-primary:hover,
    .btn-outline-primary:focus {
      color: var(--primary-deep);
      background: var(--primary-soft);
      border-color: rgba(47, 107, 255, 0.38);
      transform: translateY(-1px);
    }

    .btn-light-soft {
      background: #fff;
      color: var(--ink);
      border: 1px solid var(--border);
    }

    .btn-light-soft:hover {
      background: var(--surface-soft);
      border-color: var(--border-strong);
    }

    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 10px;
    }

    .meta-chip,
    .tag-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: #fff;
      border: 1px solid var(--border);
      color: var(--muted);
      font-size: .92rem;
      font-weight: 700;
      line-height: 1;
    }

    .tag-pill {
      background: var(--surface-soft);
    }

    .hero-stage {
      background: linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(248,251,255,.98) 100%);
      border: 1px solid rgba(215,226,240,.95);
      border-radius: 8px;
      box-shadow: var(--shadow);
      padding: 22px;
      position: relative;
      overflow: hidden;
    }

    .hero-stage::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(135deg, rgba(47,107,255,.06) 0%, transparent 38%),
        linear-gradient(225deg, rgba(18,181,176,.05) 0%, transparent 28%);
      pointer-events: none;
    }

    .stage-head {
      position: relative;
      z-index: 1;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 14px;
    }

    .stage-title {
      font-weight: 800;
      font-size: 1.1rem;
      margin: 0;
    }

    .stage-note {
      color: var(--muted);
      font-size: .92rem;
      margin: 0;
    }

    .step-list {
      position: relative;
      z-index: 1;
      display: grid;
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .step-item {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 12px 13px;
      border: 1px solid var(--border);
      border-radius: 8px;
      background: rgba(255,255,255,.98);
    }

    .step-index {
      width: 30px;
      height: 30px;
      border-radius: 999px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary-soft);
      color: var(--primary-deep);
      font-weight: 800;
      flex: 0 0 auto;
    }

    .step-item strong {
      display: block;
      font-size: .98rem;
      margin-bottom: 2px;
    }

    .step-item span {
      display: block;
      color: var(--muted);
      font-size: .92rem;
      line-height: 1.55;
    }

    .quick-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
      margin-top: 14px;
    }

    .quick-card {
      border-radius: 8px;
      border: 1px solid var(--border);
      background: #fff;
      padding: 12px;
      min-height: 86px;
    }

    .quick-card .label {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--primary-deep);
      font-weight: 800;
      font-size: .84rem;
      margin-bottom: 8px;
    }

    .quick-card p {
      margin: 0;
      color: var(--muted);
      font-size: .9rem;
      line-height: 1.6;
    }

    .section-band {
      padding: 20px 0 14px;
    }

    .section-title {
      font-size: 1.55rem;
      font-weight: 800;
      margin: 0 0 10px;
      letter-spacing: 0;
    }

    .section-desc {
      color: var(--muted);
      max-width: 54rem;
      margin: 0 0 18px;
    }

    .soft-card {
      height: 100%;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 8px;
      box-shadow: var(--shadow-soft);
      padding: 18px;
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }

    .soft-card:hover {
      transform: translateY(-2px);
      border-color: rgba(47, 107, 255, 0.22);
      box-shadow: var(--shadow);
    }

    .soft-card .icon-wrap {
      width: 42px;
      height: 42px;
      border-radius: 10px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      background: var(--primary-soft);
      color: var(--primary-deep);
      font-size: 1.2rem;
    }

    .soft-card h3,
    .soft-card h4 {
      margin: 0 0 8px;
      font-weight: 800;
      font-size: 1.05rem;
    }

    .soft-card p {
      margin: 0;
      color: var(--muted);
      line-height: 1.65;
      font-size: .95rem;
    }

    .soft-card .card-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 14px;
      color: var(--primary-deep);
      font-weight: 700;
      font-size: .92rem;
    }

    .soft-card .card-link i {
      transition: transform .2s ease;
    }

    .soft-card:hover .card-link i {
      transform: translateX(2px);
    }

    .question-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }

    .question-card {
      border: 1px solid var(--border);
      background: #fff;
      border-radius: 8px;
      padding: 16px;
      box-shadow: var(--shadow-soft);
      min-height: 128px;
    }

    .question-card .q-mark {
      width: 30px;
      height: 30px;
      border-radius: 999px;
      background: var(--accent-soft);
      color: #098f8a;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 12px;
      font-weight: 800;
    }

    .question-card strong {
      display: block;
      font-size: 1rem;
      margin-bottom: 7px;
    }

    .question-card span {
      color: var(--muted);
      font-size: .94rem;
      line-height: 1.65;
      display: block;
    }

    .stats-strip {
      background: linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(248,251,255,.98) 100%);
      border: 1px solid var(--border);
      border-radius: 8px;
      box-shadow: var(--shadow-soft);
      padding: 18px;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }

    .stat-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 16px;
      min-height: 132px;
    }

    .stat-card .num {
      font-size: 2rem;
      font-weight: 900;
      line-height: 1;
      color: var(--primary-deep);
      margin-bottom: 8px;
    }

    .stat-card .unit {
      font-size: .95rem;
      color: var(--faint);
      margin-left: 4px;
      font-weight: 700;
    }

    .stat-card .desc {
      color: var(--muted);
      font-size: .94rem;
      line-height: 1.65;
      margin: 0;
    }

    .bar-wrap {
      margin-top: 10px;
    }

    .bar-line {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: .84rem;
      color: var(--faint);
      margin-bottom: 6px;
      font-weight: 700;
    }

    .bar {
      height: 10px;
      background: #edf3fb;
      border-radius: 999px;
      overflow: hidden;
    }

    .bar > span {
      display: block;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    }

    .loop-band {
      padding: 10px 0 18px;
    }

    .loop-layout {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 18px;
      align-items: stretch;
    }

    .loop-panel,
    .entry-panel {
      border: 1px solid var(--border);
      background: #fff;
      border-radius: 8px;
      box-shadow: var(--shadow-soft);
      padding: 18px;
      height: 100%;
    }

    .loop-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 14px;
    }

    .loop-head h3,
    .entry-head h3 {
      margin: 0;
      font-size: 1.12rem;
      font-weight: 800;
    }

    .loop-head .sub,
    .entry-head .sub {
      color: var(--muted);
      font-size: .92rem;
      margin: 0;
    }

    .loop-list {
      display: grid;
      gap: 10px;
      margin: 0;
    }

    .loop-item {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 14px;
      padding: 12px 0;
      border-bottom: 1px solid rgba(215,226,240,.65);
    }

    .loop-item:last-child {
      border-bottom: 0;
      padding-bottom: 0;
    }

    .loop-item a {
      font-weight: 700;
      color: var(--ink);
    }

    .loop-item a:hover {
      color: var(--primary-deep);
    }

    .loop-item p {
      color: var(--muted);
      margin: 4px 0 0;
      font-size: .93rem;
      line-height: 1.55;
    }

    .loop-meta {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      white-space: nowrap;
      color: var(--faint);
      font-size: .82rem;
      font-weight: 700;
    }

    .entry-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .entry-tags .tag-pill.active {
      background: var(--primary-deep);
      color: #fff;
      border-color: transparent;
    }

    .entry-note {
      margin-top: 16px;
      padding: 13px 14px;
      border-radius: 8px;
      background: var(--surface-soft);
      border: 1px dashed var(--border);
      color: var(--muted);
      font-size: .92rem;
      line-height: 1.6;
    }

    .lead-band {
      padding: 18px 0 16px;
    }

    .lead-shell {
      border-radius: 8px;
      border: 1px solid var(--border);
      background:
        linear-gradient(135deg, rgba(47,107,255,.05) 0%, rgba(18,181,176,.04) 100%),
        #fff;
      box-shadow: var(--shadow-soft);
      padding: 20px;
    }

    .lead-grid {
      display: grid;
      grid-template-columns: 1fr .9fr;
      gap: 18px;
      align-items: center;
    }

    .lead-copy h3 {
      font-size: 1.32rem;
      font-weight: 800;
      margin: 0 0 10px;
    }

    .lead-copy p {
      color: var(--muted);
      margin: 0 0 16px;
      max-width: 42rem;
    }

    .lead-points {
      display: grid;
      gap: 10px;
      margin: 0 0 18px;
      padding: 0;
      list-style: none;
    }

    .lead-points li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: var(--muted);
    }

    .lead-points i {
      color: var(--accent);
      font-size: 1rem;
      margin-top: 3px;
      flex: 0 0 auto;
    }

    .lead-trigger {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 18px;
      box-shadow: 0 8px 22px rgba(27,52,92,.06);
    }

    .lead-trigger .badge-lite {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 11px;
      border-radius: 999px;
      background: var(--primary-soft);
      color: var(--primary-deep);
      font-weight: 800;
      font-size: .88rem;
      margin-bottom: 12px;
    }

    .lead-trigger h4 {
      margin: 0 0 8px;
      font-size: 1.06rem;
      font-weight: 800;
    }

    .lead-trigger p {
      color: var(--muted);
      font-size: .94rem;
      margin: 0 0 14px;
      line-height: 1.65;
    }

    .lead-trigger .mini-note {
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px solid rgba(215,226,240,.8);
      color: var(--faint);
      font-size: .86rem;
      line-height: 1.6;
    }

    .faq-band {
      padding: 18px 0;
    }

    .accordion {
      --bs-accordion-border-color: var(--border);
      --bs-accordion-border-radius: 8px;
      --bs-accordion-inner-border-radius: 8px;
      --bs-accordion-btn-padding-y: 1rem;
      --bs-accordion-btn-padding-x: 1.1rem;
      --bs-accordion-body-padding-y: 1rem;
      --bs-accordion-body-padding-x: 1.1rem;
      --bs-accordion-btn-focus-border-color: rgba(47,107,255,.24);
      --bs-accordion-btn-focus-box-shadow: 0 0 0 0.2rem rgba(47,107,255,.10);
    }

    .accordion-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 8px !important;
      box-shadow: var(--shadow-soft);
      overflow: hidden;
      margin-bottom: 12px;
    }

    .accordion-button {
      font-weight: 800;
      color: var(--ink);
      background: #fff;
    }

    .accordion-button:not(.collapsed) {
      color: var(--primary-deep);
      background: var(--primary-soft);
      box-shadow: none;
    }

    .accordion-button::after {
      background-size: 1rem;
    }

    .accordion-body {
      color: var(--muted);
      line-height: 1.72;
    }

    .privacy-band {
      padding: 14px 0 34px;
    }

    .privacy-shell {
      border-radius: 8px;
      border: 1px solid rgba(215,226,240,.95);
      background: #fff;
      padding: 18px;
      box-shadow: var(--shadow-soft);
    }

    .privacy-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
    }

    .privacy-item {
      border-radius: 8px;
      border: 1px solid var(--border);
      background: var(--surface-soft);
      padding: 14px;
    }

    .privacy-item h4 {
      font-size: .98rem;
      margin: 0 0 6px;
      font-weight: 800;
    }

    .privacy-item p {
      margin: 0;
      color: var(--muted);
      font-size: .92rem;
      line-height: 1.65;
    }

    .site-footer {
      padding: 22px 0 34px;
      border-top: 1px solid rgba(215,226,240,.8);
      background: rgba(255,255,255,.75);
    }

    .footer-shell {
      display: grid;
      grid-template-columns: 1.2fr .8fr .8fr;
      gap: 18px;
      align-items: start;
    }

    .footer-title {
      font-size: 1.02rem;
      font-weight: 800;
      margin: 0 0 10px;
    }

    .footer-links {
      display: grid;
      gap: 8px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .footer-links a {
      color: var(--muted);
      font-weight: 600;
    }

    .footer-links a:hover {
      color: var(--primary-deep);
    }

    .footer-copy {
      color: var(--muted);
      font-size: .92rem;
      line-height: 1.65;
    }

    .footer-tech {
      color: var(--faint);
      font-size: .86rem;
      line-height: 1.65;
      margin-top: 10px;
    }

    .floating-btn {
      position: fixed;
      right: 18px;
      bottom: 18px;
      z-index: 1040;
      box-shadow: 0 16px 32px rgba(47, 107, 255, 0.22);
    }

    .floating-btn .btn {
      padding: 0.88rem 1.05rem;
    }

    .modal-content {
      border-radius: 8px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .modal-header {
      border-bottom-color: rgba(215,226,240,.9);
    }

    .form-label {
      font-weight: 700;
      color: var(--ink);
    }

    .form-control,
    .form-select {
      border-radius: 8px;
      border-color: var(--border);
      box-shadow: none !important;
      padding: 0.8rem 0.95rem;
    }

    .form-control:focus,
    .form-select:focus {
      border-color: rgba(47, 107, 255, 0.42);
      box-shadow: 0 0 0 0.2rem rgba(47, 107, 255, 0.10) !important;
    }

    .small-help {
      color: var(--faint);
      font-size: .88rem;
      line-height: 1.6;
    }

    .alert-soft {
      border-radius: 8px;
      border: 1px solid rgba(47, 107, 255, 0.14);
      background: #f5f8ff;
      color: var(--primary-deep);
    }

    .text-muted-soft {
      color: var(--muted) !important;
    }

    .anchor-offset {
      scroll-margin-top: 110px;
    }

    @media (max-width: 1199.98px) {
      .hero-title {
        font-size: 2.6rem;
      }

      .question-grid,
      .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .loop-layout,
      .lead-grid,
      .footer-shell {
        grid-template-columns: 1fr;
      }

      .privacy-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 991.98px) {
      .site-nav-shell {
        border-radius: 22px;
      }

      .hero-section {
        padding-top: 32px;
      }

      .hero-title {
        font-size: 2.25rem;
      }

      .hero-desc {
        font-size: 1rem;
      }

      .quick-grid {
        grid-template-columns: 1fr;
      }

      .navbar-collapse {
        padding-top: 12px;
      }

      .navbar .nav-link {
        padding: 10px 14px;
      }
    }

    @media (max-width: 767.98px) {
      .site-header {
        top: 8px;
      }

      .site-nav-shell {
        padding: 10px 12px;
      }

      .hero-section {
        padding: 26px 0 18px;
      }

      .hero-title {
        font-size: 1.95rem;
      }

      .section-title {
        font-size: 1.28rem;
      }

      .question-grid,
      .stats-grid {
        grid-template-columns: 1fr;
      }

      .hero-stage,
      .soft-card,
      .question-card,
      .stat-card,
      .loop-panel,
      .entry-panel,
      .lead-shell,
      .privacy-shell {
        padding: 16px;
      }

      .stage-head,
      .loop-head {
        flex-direction: column;
        align-items: flex-start;
      }

      .hero-actions {
        gap: 10px;
      }

      .btn {
        width: 100%;
        justify-content: center;
      }

      .hero-actions .btn {
        width: calc(50% - 5px);
      }

      .entry-tags {
        gap: 8px;
      }

      .floating-btn {
        right: 12px;
        bottom: 12px;
      }
    }

    @media (max-width: 520px) {
      .hero-title {
        font-size: 1.78rem;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .meta-chip,
      .tag-pill {
        width: auto;
      }

      .brand-name {
        font-size: .98rem;
      }

      .brand-sub {
        display: none;
      }
    }

    :focus-visible {
      outline: 3px solid rgba(47,107,255,.20);
      outline-offset: 2px;
    }

/* roulang page: category1 */
:root{
      --bg: #f4f8fc;
      --surface: #ffffff;
      --surface-soft: #eef5fb;
      --surface-soft-2: #e8f1fa;
      --primary: #2b6cb0;
      --primary-deep: #23598e;
      --primary-soft: #d8e7f5;
      --accent: #5ca7d8;
      --text: #17324d;
      --muted: #6f8297;
      --border: #d6e2ef;
      --line: #e5edf5;
      --shadow: 0 14px 36px rgba(26, 61, 97, .10);
      --shadow-soft: 0 8px 22px rgba(26, 61, 97, .08);
      --radius: 8px;
      --radius-sm: 6px;
      --space-1: 0.25rem;
      --space-2: 0.5rem;
      --space-3: 0.75rem;
      --space-4: 1rem;
      --space-5: 1.25rem;
      --space-6: 1.5rem;
      --space-7: 2rem;
      --space-8: 2.75rem;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--text);
      background:
        linear-gradient(180deg, #f7fbff 0%, #f2f7fc 50%, #edf4fa 100%);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Noto Sans SC", sans-serif;
      line-height: 1.65;
      letter-spacing: 0;
      overflow-x: hidden;
    }
    img { max-width: 100%; display: block; }
    a { color: inherit; text-decoration: none; }
    a:hover { color: var(--primary); }
    button, input, select, textarea {
      font: inherit;
    }
    button:focus-visible,
    a:focus-visible,
    input:focus-visible,
    select:focus-visible,
    textarea:focus-visible {
      outline: 3px solid rgba(43, 108, 176, .22);
      outline-offset: 2px;
    }

    .container {
      max-width: 1180px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1020;
      padding: 14px 0 10px;
      backdrop-filter: blur(12px);
    }

    .site-nav-shell {
      background: rgba(255, 255, 255, .92);
      border: 1px solid rgba(214, 226, 239, .92);
      border-radius: 999px;
      box-shadow: var(--shadow-soft);
      padding: .7rem 1rem;
    }

    .brand-mark {
      display: inline-flex;
      align-items: center;
      gap: .75rem;
      min-width: 0;
    }

    .brand-badge {
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: linear-gradient(180deg, #ebf4fc 0%, #dbe9f7 100%);
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: inset 0 0 0 1px rgba(43, 108, 176, .08);
      flex: 0 0 auto;
    }

    .brand-name {
      font-weight: 800;
      font-size: 1rem;
      line-height: 1.15;
      color: var(--text);
      white-space: nowrap;
    }

    .brand-sub,
    .footer-copy,
    .footer-tech,
    .section-note,
    .support-text,
    .topic-excerpt,
    .privacy-text,
    .card-meta,
    .form-hint,
    .helper-text {
      color: var(--muted);
    }

    .brand-sub {
      font-size: .82rem;
      line-height: 1.15;
    }

    .navbar-toggler {
      border-radius: 999px;
      border-color: var(--border);
      box-shadow: none !important;
      padding: .55rem .75rem;
    }

    .navbar-toggler:focus {
      box-shadow: 0 0 0 .18rem rgba(43, 108, 176, .12);
    }

    .navbar-nav {
      gap: .35rem;
    }

    .nav-link {
      padding: .62rem 1rem !important;
      border-radius: 999px;
      color: var(--text);
      font-weight: 600;
      transition: all .2s ease;
      border: 1px solid transparent;
    }

    .nav-link:hover {
      background: #eff5fb;
      border-color: rgba(43, 108, 176, .08);
      color: var(--primary);
    }

    .nav-link.active,
    .nav-link[aria-current="page"] {
      background: #e3effa;
      color: var(--primary-deep) !important;
      border-color: rgba(43, 108, 176, .10);
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.55);
    }

    .page-shell {
      padding-bottom: 1.5rem;
    }

    .hero-band {
      padding: 2.1rem 0 1.2rem;
    }

    .hero-wrap {
      background:
        linear-gradient(180deg, rgba(255,255,255,.94), rgba(248,251,254,.98));
      border: 1px solid var(--border);
      border-radius: calc(var(--radius) + 2px);
      box-shadow: var(--shadow);
      padding: 1.4rem;
    }

    .eyebrow-row {
      display: flex;
      flex-wrap: wrap;
      gap: .6rem;
      align-items: center;
      margin-bottom: 1rem;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      padding: .42rem .8rem;
      border-radius: 999px;
      background: #eaf3fb;
      color: var(--primary-deep);
      font-weight: 700;
      font-size: .84rem;
      letter-spacing: 0;
    }

    .pill-soft {
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .42rem .72rem;
      border-radius: 999px;
      background: var(--surface-soft);
      color: var(--muted);
      font-size: .84rem;
      font-weight: 600;
      border: 1px solid var(--border);
    }

    .hero-title {
      font-size: clamp(1.9rem, 3.2vw, 3rem);
      line-height: 1.18;
      font-weight: 900;
      letter-spacing: 0;
      margin: 0 0 1rem;
    }

    .hero-subtitle {
      max-width: 42rem;
      color: var(--muted);
      font-size: 1.02rem;
      margin-bottom: 1.25rem;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: .75rem;
      margin-top: 1.25rem;
    }

    .btn {
      border-radius: 999px;
      font-weight: 700;
      padding: .76rem 1.1rem;
      transition: all .2s ease;
      box-shadow: none !important;
    }

    .btn-primary {
      background: linear-gradient(180deg, #3778bc 0%, #2b6cb0 100%);
      border-color: #2b6cb0;
      color: #fff;
    }

    .btn-primary:hover,
    .btn-primary:focus {
      background: linear-gradient(180deg, #356fae 0%, #23598e 100%);
      border-color: #23598e;
      transform: translateY(-1px);
    }

    .btn-outline-primary {
      border-color: rgba(43, 108, 176, .22);
      color: var(--primary-deep);
      background: #fff;
    }

    .btn-outline-primary:hover,
    .btn-outline-primary:focus {
      background: #edf5fc;
      color: var(--primary-deep);
      border-color: rgba(43, 108, 176, .28);
      transform: translateY(-1px);
    }

    .btn-light-soft {
      background: #f6faff;
      border: 1px solid var(--border);
      color: var(--text);
    }

    .btn-light-soft:hover {
      background: #edf5fc;
      border-color: rgba(43, 108, 176, .18);
      transform: translateY(-1px);
    }

    .hero-panel {
      background: linear-gradient(180deg, #f9fcff 0%, #f2f7fc 100%);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1.2rem;
      height: 100%;
      box-shadow: var(--shadow-soft);
    }

    .panel-title {
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: .9rem;
    }

    .step-list {
      display: grid;
      gap: .75rem;
      padding: 0;
      margin: 0;
      list-style: none;
    }

    .step-item {
      display: flex;
      align-items: flex-start;
      gap: .75rem;
      padding: .8rem .85rem;
      border-radius: var(--radius);
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.45);
    }

    .step-idx {
      width: 30px;
      height: 30px;
      border-radius: 999px;
      background: #e6f0fa;
      color: var(--primary-deep);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: .82rem;
      font-weight: 800;
      flex: 0 0 auto;
    }

    .step-body strong {
      display: block;
      font-size: .95rem;
      margin-bottom: .1rem;
    }

    .step-body span {
      display: block;
      color: var(--muted);
      font-size: .88rem;
    }

    .metric-row {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: .85rem;
      margin-top: 1rem;
    }

    .metric-card {
      background: rgba(255,255,255,.92);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: .9rem .85rem;
      box-shadow: var(--shadow-soft);
      min-height: 88px;
    }

    .metric-value {
      font-size: 1.55rem;
      line-height: 1;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: .3rem;
    }

    .metric-label {
      font-size: .88rem;
      font-weight: 700;
      margin-bottom: .12rem;
    }

    .metric-desc {
      font-size: .82rem;
      color: var(--muted);
      line-height: 1.45;
    }

    .section-band {
      padding: 1rem 0 1.4rem;
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 1rem;
      margin-bottom: 1rem;
    }

    .section-title {
      font-size: 1.35rem;
      line-height: 1.25;
      font-weight: 900;
      margin: 0;
    }

    .section-note {
      font-size: .93rem;
      margin: .25rem 0 0;
    }

    .control-shell {
      background: rgba(255,255,255,.92);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1rem;
      box-shadow: var(--shadow-soft);
    }

    .chip-row {
      display: flex;
      flex-wrap: wrap;
      gap: .55rem;
    }

    .filter-chip {
      border: 1px solid var(--border);
      background: #fff;
      color: var(--text);
      border-radius: 999px;
      padding: .55rem .85rem;
      font-weight: 700;
      font-size: .88rem;
      transition: all .2s ease;
    }

    .filter-chip:hover {
      background: #edf5fc;
      border-color: rgba(43, 108, 176, .2);
      color: var(--primary-deep);
      transform: translateY(-1px);
    }

    .filter-chip.active {
      background: #e3effa;
      border-color: rgba(43, 108, 176, .16);
      color: var(--primary-deep);
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.6);
    }

    .search-box .form-control {
      height: 48px;
      border-radius: 999px;
      border-color: var(--border);
      box-shadow: none;
      padding-left: 1rem;
      padding-right: 1rem;
      background: #fff;
    }

    .search-box .form-control:focus {
      border-color: rgba(43, 108, 176, .35);
      box-shadow: 0 0 0 .2rem rgba(43, 108, 176, .08);
    }

    .search-box .input-group-text {
      border-radius: 999px 0 0 999px;
      border-color: var(--border);
      background: #fff;
      color: var(--muted);
    }

    .search-box .btn {
      min-width: 98px;
    }

    .topic-grid {
      display: grid;
      gap: .85rem;
    }

    .topic-card {
      background: rgba(255,255,255,.97);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-soft);
      padding: 1rem;
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
      display: block;
    }

    .topic-card:hover {
      transform: translateY(-2px);
      border-color: rgba(43, 108, 176, .18);
      box-shadow: var(--shadow);
    }

    .topic-row {
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      justify-content: space-between;
    }

    .topic-main {
      min-width: 0;
      flex: 1 1 auto;
    }

    .topic-topline {
      display: flex;
      flex-wrap: wrap;
      gap: .55rem;
      align-items: center;
      margin-bottom: .45rem;
    }

    .topic-index {
      width: 28px;
      height: 28px;
      border-radius: 999px;
      background: #ecf4fb;
      color: var(--primary-deep);
      font-size: .82rem;
      font-weight: 800;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
    }

    .topic-title {
      font-size: 1.03rem;
      line-height: 1.38;
      font-weight: 800;
      margin: 0;
    }

    .topic-badge {
      font-size: .76rem;
      font-weight: 800;
      padding: .3rem .55rem;
      border-radius: 999px;
      background: #edf5fc;
      color: var(--primary-deep);
      border: 1px solid rgba(43, 108, 176, .12);
    }

    .topic-excerpt {
      margin: .5rem 0 .8rem;
      font-size: .94rem;
      line-height: 1.65;
    }

    .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: .45rem;
    }

    .mini-tag {
      padding: .32rem .56rem;
      border-radius: 999px;
      background: var(--surface-soft);
      border: 1px solid var(--border);
      color: var(--muted);
      font-size: .78rem;
      font-weight: 700;
    }

    .topic-meta {
      flex: 0 0 190px;
      display: grid;
      gap: .7rem;
      justify-items: end;
      text-align: right;
    }

    .heat-box {
      display: inline-flex;
      align-items: baseline;
      gap: .35rem;
      color: var(--primary-deep);
      background: #eef5fb;
      border: 1px solid rgba(43, 108, 176, .12);
      border-radius: var(--radius);
      padding: .45rem .65rem;
    }

    .heat-box strong {
      font-size: 1.3rem;
      line-height: 1;
      font-weight: 900;
    }

    .heat-box span {
      font-size: .82rem;
      font-weight: 700;
    }

    .topic-time {
      font-size: .85rem;
      color: var(--muted);
      font-weight: 600;
    }

    .topic-action {
      min-width: 100px;
    }

    .list-footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      flex-wrap: wrap;
      margin-top: 1rem;
      padding-top: 1rem;
      border-top: 1px solid var(--line);
    }

    .page-links .page-link {
      border-radius: 999px;
      border: 1px solid var(--border);
      color: var(--text);
      margin: 0 .14rem;
      padding: .56rem .85rem;
      background: #fff;
      box-shadow: none;
    }

    .page-links .page-link:hover {
      background: #edf5fc;
      color: var(--primary-deep);
      border-color: rgba(43, 108, 176, .18);
    }

    .page-links .page-item.active .page-link {
      background: #e3effa;
      border-color: rgba(43, 108, 176, .18);
      color: var(--primary-deep);
      font-weight: 800;
    }

    .lead-band {
      padding: 1rem 0 1.4rem;
    }

    .lead-shell {
      background: linear-gradient(180deg, #ffffff 0%, #f5f9fd 100%);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-soft);
      padding: 1.2rem;
    }

    .lead-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 1rem;
      align-items: stretch;
    }

    .lead-copy {
      padding-right: 1rem;
    }

    .lead-title {
      font-size: 1.25rem;
      line-height: 1.3;
      font-weight: 900;
      margin-bottom: .55rem;
    }

    .lead-text {
      margin: 0 0 1rem;
      color: var(--muted);
      max-width: 42rem;
    }

    .lead-actions {
      display: flex;
      flex-wrap: wrap;
      gap: .7rem;
    }

    .lead-note {
      height: 100%;
      border-radius: var(--radius);
      border: 1px dashed rgba(43, 108, 176, .22);
      background: #f8fbfe;
      padding: 1rem;
    }

    .lead-note ul {
      list-style: none;
      padding: 0;
      margin: .7rem 0 0;
      display: grid;
      gap: .55rem;
    }

    .lead-note li {
      display: flex;
      gap: .55rem;
      align-items: flex-start;
      color: var(--muted);
      font-size: .9rem;
    }

    .lead-note i {
      color: var(--primary);
      margin-top: .14rem;
    }

    .faq-band {
      padding: 1rem 0 1.3rem;
    }

    .faq-shell {
      background: rgba(255,255,255,.94);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-soft);
      padding: 1rem;
    }

    .accordion {
      --bs-accordion-border-color: var(--border);
      --bs-accordion-btn-bg: #fff;
      --bs-accordion-btn-color: var(--text);
      --bs-accordion-active-bg: #eef5fb;
      --bs-accordion-active-color: var(--primary-deep);
      --bs-accordion-btn-focus-box-shadow: none;
      --bs-accordion-body-padding-y: 1rem;
      --bs-accordion-body-padding-x: 1rem;
      --bs-accordion-btn-padding-y: .95rem;
      --bs-accordion-btn-padding-x: 1rem;
    }

    .accordion-item {
      border-radius: var(--radius);
      overflow: hidden;
      margin-bottom: .7rem;
      border: 1px solid var(--border);
      box-shadow: none;
    }

    .accordion-button {
      font-weight: 800;
    }

    .accordion-button:not(.collapsed) {
      box-shadow: inset 0 -1px 0 rgba(43, 108, 176, .08);
    }

    .privacy-band {
      padding: 0 0 1.8rem;
    }

    .privacy-shell {
      border-top: 1px solid var(--line);
      padding-top: 1rem;
    }

    .privacy-box {
      background: rgba(255,255,255,.82);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1rem;
    }

    .privacy-box ul {
      list-style: none;
      padding: 0;
      margin: .75rem 0 0;
      display: grid;
      gap: .5rem;
    }

    .privacy-box li {
      display: flex;
      align-items: flex-start;
      gap: .55rem;
      color: var(--muted);
      font-size: .9rem;
    }

    .privacy-box i {
      color: var(--primary);
      margin-top: .14rem;
    }

    .site-footer {
      padding: 1.1rem 0 1.8rem;
    }

    .footer-shell {
      background: rgba(255,255,255,.92);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1.2rem;
      box-shadow: var(--shadow-soft);
      display: grid;
      grid-template-columns: 1.4fr .8fr .9fr;
      gap: 1rem;
    }

    .footer-title {
      font-size: .98rem;
      font-weight: 800;
      margin-bottom: .6rem;
    }

    .footer-links {
      list-style: none;
      margin: 0;
      padding: 0;
      display: grid;
      gap: .45rem;
    }

    .footer-links a {
      color: var(--muted);
      font-weight: 600;
    }

    .footer-links a:hover {
      color: var(--primary-deep);
    }

    .footer-tech {
      font-size: .84rem;
      margin-top: .4rem;
    }

    .floating-action {
      position: fixed;
      right: 18px;
      bottom: 18px;
      z-index: 1030;
      box-shadow: var(--shadow);
    }

    .floating-action .btn {
      min-width: 52px;
      min-height: 52px;
      padding: 0 .95rem;
      display: inline-flex;
      align-items: center;
      gap: .45rem;
    }

    .modal-content {
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .modal-header {
      border-bottom-color: var(--line);
    }

    .modal-title {
      font-weight: 900;
    }

    .form-control,
    .form-select {
      border-radius: 8px;
      border-color: var(--border);
      min-height: 46px;
      box-shadow: none;
    }

    .form-control:focus,
    .form-select:focus {
      border-color: rgba(43, 108, 176, .35);
      box-shadow: 0 0 0 .2rem rgba(43, 108, 176, .08);
    }

    .modal-note {
      background: #f8fbfe;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: .85rem .9rem;
      color: var(--muted);
      font-size: .9rem;
    }

    .form-feedback {
      display: none;
      border-radius: var(--radius);
      background: #eef6fd;
      border: 1px solid rgba(43, 108, 176, .15);
      color: var(--primary-deep);
      padding: .8rem .9rem;
      font-weight: 700;
    }

    .form-feedback.show {
      display: block;
    }

    @media (max-width: 991.98px) {
      .hero-wrap,
      .control-shell,
      .lead-shell,
      .faq-shell,
      .privacy-box,
      .footer-shell {
        padding: 1rem;
      }

      .metric-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .lead-grid,
      .footer-shell {
        grid-template-columns: 1fr;
      }

      .topic-row {
        flex-direction: column;
      }

      .topic-meta {
        flex: 1 1 auto;
        width: 100%;
        justify-items: start;
        text-align: left;
      }

      .list-footer {
        align-items: flex-start;
      }

      .site-nav-shell {
        border-radius: 24px;
        padding: .75rem .9rem;
      }

      .navbar-collapse {
        margin-top: .75rem;
        padding: .8rem;
        background: rgba(255, 255, 255, .96);
        border: 1px solid var(--border);
        border-radius: 18px;
      }
    }

    @media (max-width: 767.98px) {
      .hero-band {
        padding-top: 1.5rem;
      }

      .hero-title {
        font-size: 1.75rem;
      }

      .hero-subtitle,
      .section-note,
      .topic-excerpt,
      .lead-text {
        font-size: .95rem;
      }

      .section-head {
        flex-direction: column;
        align-items: flex-start;
      }

      .search-box .btn {
        min-width: 86px;
      }

      .metric-row {
        grid-template-columns: 1fr;
      }

      .chip-row {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: .15rem;
        -webkit-overflow-scrolling: touch;
      }

      .filter-chip {
        flex: 0 0 auto;
      }

      .page-links {
        overflow-x: auto;
        white-space: nowrap;
        max-width: 100%;
      }
    }

    @media (max-width: 575.98px) {
      .hero-actions,
      .lead-actions {
        flex-direction: column;
      }

      .hero-actions .btn,
      .lead-actions .btn,
      .floating-action .btn {
        width: 100%;
        justify-content: center;
      }

      .search-box .input-group {
        flex-direction: column;
      }

      .search-box .input-group-text {
        border-radius: 8px 8px 0 0;
      }

      .search-box .form-control {
        border-radius: 0;
      }

      .search-box .btn {
        border-radius: 0 0 8px 8px;
      }

      .lead-copy {
        padding-right: 0;
      }
    }