*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --bg:       #0b0f1c;
      --fg:       #f0f4f8;
      --card:     #0f1525;
      --border:   #1c2636;
      --primary:  #f5a620;
      --primary-fg: #0b0f1c;
      --muted:    #8395a4;
      --amber:    #fbbf24;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: 'Noto Sans TC', sans-serif;
      background-color: var(--bg);
      color: var(--fg);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
      background-image:
        radial-gradient(circle at top right, rgba(67,150,255,.05), transparent 40%),
        radial-gradient(circle at bottom left, rgba(245,158,11,.03), transparent 40%);
    }

    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    hr { border: none; border-top: 1px solid rgba(255,255,255,.05); }

    h1 { font-size: clamp(1.85rem, 5vw, 3rem); font-weight: 700; line-height: 1.15; letter-spacing: -.02em; }
    h2 { font-size: clamp(1.3rem, 3vw, 1.75rem); font-weight: 700; line-height: 1.3; }
    h3 { font-size: 1.05rem; font-weight: 700; line-height: 1.4; }

    .container   { max-width: 72rem; margin: 0 auto; padding: 0 1.25rem; }
    .container-sm{ max-width: 48rem; margin: 0 auto; padding: 0 1.25rem; }
    .container-md{ max-width: 60rem; margin: 0 auto; padding: 0 1.25rem; }

    /* ── Navbar ── */
    #navbar {
      position: fixed; top: 0; left: 0; right: 0; z-index: 50;
      background: rgba(11,15,28,.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 4px 24px rgba(0,0,0,.3);
    }
    .nav-inner {
      display: flex; align-items: center; justify-content: space-between;
      height: 5rem; max-width: 90rem; margin: 0 auto; padding: 0 1.25rem;
    }
    .nav-logo { display: flex; align-items: center; gap: .75rem; }
    .nav-logo-icon {
      width: 2.5rem; height: 2.5rem; border-radius: .75rem;
      background: linear-gradient(135deg, var(--primary), #d97706);
      display: flex; align-items: center; justify-content: center;
      box-shadow: 0 4px 12px rgba(245,166,32,.3); flex-shrink: 0;
    }
    .nav-logo-text { font-family: 'Outfit', sans-serif; font-size: 1.125rem; font-weight: 700; }
    .nav-logo-text span { color: var(--primary); }

    /* ── Buttons ── */
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
      padding: .875rem 2rem; border-radius: .75rem; font-size: 1rem;
      font-weight: 600; cursor: pointer; transition: all .2s; border: none;
      text-decoration: none; white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary); color: var(--primary-fg);
      box-shadow: 0 4px 16px rgba(245,166,32,.25);
    }
    .btn-primary:hover { background: #e09510; transform: translateY(-1px); }
    .btn-outline {
      background: rgba(255,255,255,.05); color: var(--fg);
      border: 1px solid rgba(255,255,255,.15); font-weight: 500;
    }
    .btn-outline:hover { background: rgba(255,255,255,.1); }
    .btn-sm { padding: .5rem 1rem; font-size: .875rem; border-radius: .5rem; }
    .btn-row { display: flex; flex-wrap: wrap; gap: 1rem; }

    /* ── Article layout ── */
    .article-hero {
      padding-top: 8rem; padding-bottom: 3rem;
      border-bottom: 1px solid var(--border);
    }
    .breadcrumb {
      display: flex; align-items: center; gap: .5rem;
      font-size: .8125rem; color: var(--muted); margin-bottom: 1.5rem;
    }
    .breadcrumb a:hover { color: var(--primary); }
    .breadcrumb-sep { opacity: .4; }
    .article-badge {
      display: inline-flex; align-items: center; gap: .5rem;
      padding: .3rem .875rem; border-radius: 9999px;
      background: rgba(245,166,32,.1); border: 1px solid rgba(245,166,32,.2);
      color: var(--primary); font-size: .8125rem; font-weight: 600; margin-bottom: 1.5rem;
    }
    .article-meta {
      display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
      margin-top: 1.75rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
    }
    .article-meta-author {
      display: flex; align-items: center; gap: .625rem;
    }
    .author-avatar {
      width: 2.5rem; height: 2.5rem; border-radius: 9999px; overflow: hidden;
      border: 2px solid rgba(245,166,32,.3); flex-shrink: 0;
    }
    .author-avatar img { width: 100%; height: 100%; object-fit: cover; }
    .author-name { font-weight: 700; font-size: .9375rem; }
    .author-cred { font-size: .8125rem; color: var(--muted); }
    .meta-divider { width: 1px; height: 2rem; background: var(--border); }
    .article-meta-date { font-size: .8125rem; color: var(--muted); }

    /* ── Article body ── */
    .article-body { padding: 3.5rem 0 2rem; }
    .article-section { margin-bottom: 4rem; }
    .article-section:last-child { margin-bottom: 0; }
    .section-h2 {
      font-size: clamp(1.25rem, 2.8vw, 1.625rem); font-weight: 700;
      color: var(--fg); margin-bottom: 1.5rem; line-height: 1.3;
      padding-bottom: .75rem; border-bottom: 2px solid rgba(245,166,32,.25);
    }
    .section-h3 {
      font-size: 1.0625rem; font-weight: 700; color: var(--fg);
      margin-top: 2rem; margin-bottom: .875rem; line-height: 1.4;
      display: flex; align-items: flex-start; gap: .625rem;
    }
    .section-h3::before {
      content: '';
      display: inline-block; width: 3px; height: 1.25em; flex-shrink: 0;
      background: var(--primary); border-radius: 2px; margin-top: .1em;
    }
    .article-p {
      font-size: .9625rem; color: rgba(240,244,248,.88);
      line-height: 1.85; margin-bottom: 1.25rem;
    }
    .article-p:last-child { margin-bottom: 0; }
    .article-p strong { color: var(--fg); }
    .article-p a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
    .article-p a:hover { opacity: .8; }

    /* ── Citation box ── */
    .cite-box {
      background: rgba(15,21,37,.7); border-left: 3px solid rgba(245,166,32,.5);
      border-radius: 0 .75rem .75rem 0; padding: 1rem 1.25rem;
      margin: 1.5rem 0; font-size: .875rem; color: rgba(240,244,248,.7);
      line-height: 1.75; font-style: italic;
    }
    .cite-box cite { font-style: normal; color: var(--primary); font-weight: 600; }
    .cite-box a { color: rgba(245,166,32,.7); text-decoration: underline; text-underline-offset: 2px; }

    /* ── Info callout ── */
    .callout {
      background: rgba(245,166,32,.05); border: 1px solid rgba(245,166,32,.2);
      border-radius: .875rem; padding: 1.25rem 1.5rem;
      margin: 1.75rem 0;
    }
    .callout-title {
      font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
      color: var(--primary); margin-bottom: .625rem;
    }
    .callout p { font-size: .9rem; color: rgba(240,244,248,.85); line-height: 1.75; }
    .callout p strong { color: var(--fg); }

    /* ── Symptom list ── */
    .symptom-cards { display: flex; flex-direction: column; gap: 1rem; margin: 1.5rem 0; }
    .symptom-card {
      background: rgba(15,21,37,.5); border: 1px solid var(--border);
      border-radius: .875rem; padding: 1.25rem 1.5rem;
    }
    .symptom-card-label {
      display: inline-flex; align-items: center; gap: .4rem;
      font-size: .75rem; font-weight: 700; letter-spacing: .06em;
      color: var(--amber); margin-bottom: .625rem;
    }
    .symptom-card h3 {
      font-size: 1rem; font-weight: 700; margin-bottom: .625rem; line-height: 1.4;
    }
    .symptom-card h3::before { display: none; }
    .symptom-card p { font-size: .875rem; color: var(--muted); line-height: 1.75; }
    .symptom-card p strong { color: rgba(240,244,248,.85); }

    /* ── Comparison table ── */
    .compare-table-wrap { overflow-x: auto; margin: 1.75rem 0; border-radius: .875rem; border: 1px solid var(--border); }
    .compare-table { width: 100%; border-collapse: collapse; }
    .compare-table th {
      background: rgba(15,21,37,.8); padding: .875rem 1.25rem;
      font-size: .8125rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase;
      color: var(--primary); text-align: left; border-bottom: 1px solid var(--border);
    }
    .compare-table th:first-child { border-radius: .875rem 0 0 0; }
    .compare-table th:last-child { border-radius: 0 .875rem 0 0; }
    .compare-table td {
      padding: .875rem 1.25rem; font-size: .9rem;
      color: rgba(240,244,248,.85); border-bottom: 1px solid rgba(255,255,255,.04);
      vertical-align: top; line-height: 1.7;
    }
    .compare-table tr:last-child td { border-bottom: none; }
    .compare-table tr:hover td { background: rgba(245,166,32,.03); }
    .compare-table .tag {
      display: inline-block; font-family: 'Outfit', sans-serif; font-weight: 800;
      font-size: .8rem; letter-spacing: .06em; padding: .2rem .65rem; border-radius: .375rem;
      background: rgba(245,166,32,.1); color: var(--primary); border: 1px solid rgba(245,166,32,.2);
    }

    /* ── Four-layer cards ── */
    .layer-cards { display: flex; flex-direction: column; gap: 1.25rem; margin: 1.5rem 0; }
    .layer-card {
      background: rgba(15,21,37,.5); border: 1px solid var(--border);
      border-radius: 1rem; padding: 1.5rem 1.75rem;
      display: grid; grid-template-columns: auto 1fr; gap: 1.25rem; align-items: start;
    }
    .layer-num {
      font-family: 'Outfit', sans-serif; font-size: 2.25rem; font-weight: 800;
      color: rgba(245,166,32,.15); line-height: 1; user-select: none;
      min-width: 2.5rem;
    }
    .layer-tag {
      display: inline-block; padding: .2rem .65rem; border-radius: 9999px;
      background: rgba(245,166,32,.1); border: 1px solid rgba(245,166,32,.2);
      color: var(--primary); font-size: .75rem; font-weight: 700; letter-spacing: .05em;
      margin-bottom: .625rem;
    }
    .layer-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .625rem; line-height: 1.4; }
    .layer-card h3::before { display: none; }
    .layer-card p { font-size: .875rem; color: var(--muted); line-height: 1.75; }
    .layer-card p strong { color: rgba(240,244,248,.85); }

    /* ── Audience cards ── */
    .audience-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.5rem 0; }
    @media(max-width:640px) { .audience-cards { grid-template-columns: 1fr; } }
    .audience-card {
      background: rgba(15,21,37,.5); border: 1px solid var(--border);
      border-radius: .875rem; padding: 1.25rem 1.5rem;
    }
    .audience-card-icon {
      width: 2rem; height: 2rem; border-radius: .5rem;
      background: rgba(245,166,32,.1); display: flex; align-items: center; justify-content: center;
      margin-bottom: .875rem;
    }
    .audience-card h3 { font-size: .9375rem; font-weight: 700; margin-bottom: .5rem; }
    .audience-card h3::before { display: none; }
    .audience-card p { font-size: .8125rem; color: var(--muted); line-height: 1.7; }

    /* ── Step list ── */
    .step-list { display: flex; flex-direction: column; gap: 1rem; margin: 1.5rem 0; }
    .step-item {
      display: grid; grid-template-columns: 2rem 1fr; gap: 1rem; align-items: start;
    }
    .step-num {
      width: 2rem; height: 2rem; border-radius: 9999px; flex-shrink: 0;
      background: rgba(245,166,32,.15); border: 1px solid rgba(245,166,32,.3);
      display: flex; align-items: center; justify-content: center;
      font-size: .8125rem; font-weight: 700; color: var(--primary);
    }
    .step-content h3 { font-size: .9375rem; font-weight: 700; margin-bottom: .375rem; }
    .step-content h3::before { display: none; }
    .step-content p { font-size: .875rem; color: var(--muted); line-height: 1.7; }
    .step-content p strong { color: rgba(240,244,248,.85); }

    /* ── Maturity cards ── */
    .maturity-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; margin: 1.5rem 0; }
    @media(max-width:640px) { .maturity-grid { grid-template-columns: 1fr; } }
    .maturity-card {
      background: rgba(15,21,37,.5); border: 1px solid var(--border);
      border-radius: .875rem; padding: 1.25rem 1.5rem;
    }
    .maturity-label {
      font-size: .75rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
      color: var(--primary); margin-bottom: .5rem;
    }
    .maturity-card h3 { font-size: .9375rem; font-weight: 700; margin-bottom: .5rem; }
    .maturity-card h3::before { display: none; }
    .maturity-card p { font-size: .8125rem; color: var(--muted); line-height: 1.7; }
    .maturity-card a { color: rgba(245,166,32,.8); text-decoration: underline; text-underline-offset: 2px; }

    /* ── FAQ ── */
    .faq-list { display: flex; flex-direction: column; gap: .75rem; margin-top: 1.5rem; }
    .faq-item {
      background: rgba(15,21,37,.5); border: 1px solid var(--border);
      border-radius: 1rem; overflow: hidden;
    }
    .faq-q {
      display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem;
      padding: 1.25rem 1.5rem; cursor: pointer; list-style: none; font-weight: 700;
      font-size: .9375rem; color: var(--fg);
    }
    .faq-q::-webkit-details-marker { display: none; }
    .faq-icon {
      flex-shrink: 0; width: 1.25rem; height: 1.25rem; color: var(--primary); margin-top: .1rem;
      transition: transform .2s;
    }
    .faq-item details[open] ~ * .faq-icon,
    .faq-item details[open] .faq-icon { transform: rotate(45deg); }
    .faq-item:has(details[open]) { border-color: rgba(245,166,32,.3); background: var(--card); }
    .faq-a {
      padding: 0 1.5rem 1.5rem; padding-top: 1rem;
      font-size: .9rem; color: var(--muted); line-height: 1.8;
      border-top: 1px solid var(--border);
    }
    .faq-a strong { color: rgba(240,244,248,.85); }

    /* ── CTA section ── */
    .article-cta {
      background: linear-gradient(to top, rgba(245,166,32,.08), transparent);
      border-top: 1px solid var(--border);
      padding: 5rem 0; text-align: center; margin-top: 2rem;
    }
    .article-cta h2 { margin-bottom: 1.25rem; }
    .article-cta .cta-sub { color: var(--muted); margin-bottom: 1rem; }
    .article-cta .cta-body {
      color: rgba(240,244,248,.88); margin-bottom: 2.5rem;
      max-width: 38rem; margin-left: auto; margin-right: auto; line-height: 1.8;
      font-size: .9625rem;
    }
    .article-cta .btn-row { justify-content: center; }

    /* ── Footer ── */
    footer {
      background: var(--bg); border-top: 1px solid var(--border);
      padding: 3rem 0; margin-top: 0; text-align: center; color: var(--muted);
    }
    .footer-logo { display: flex; align-items: center; justify-content: center; gap: .5rem; margin-bottom: 1rem; opacity: .5; }
    .footer-logo span { font-family: 'Outfit', sans-serif; font-size: 1.125rem; font-weight: 700; }

    /* ── Responsive ── */
    @media(max-width:640px) {
      .btn-row { flex-direction: column; }
      .btn { width: 100%; }
      .layer-card { grid-template-columns: 1fr; }
      .layer-num { font-size: 1.5rem; }
    }