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

    #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); }
    .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); }
    .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-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); }
    .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 { padding: 3.5rem 0 2rem; }
    .article-section { margin-bottom: 4rem; }
    .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 strong { color: var(--fg); }
    .article-p a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }

    .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; }

    .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); }

    .four-keys { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; margin: 1.75rem 0; }
    @media(max-width:640px) { .four-keys { grid-template-columns: 1fr; } }
    .key-card { background: rgba(15,21,37,.5); border: 1px solid var(--border); border-radius: 1rem; padding: 1.5rem 1.75rem; position: relative; }
    .key-num { font-family: 'Outfit', sans-serif; font-size: 2.5rem; font-weight: 800; color: rgba(245,166,32,.1); position: absolute; top: 1rem; right: 1.25rem; line-height: 1; }
    .key-tag { display: inline-block; padding: .25rem .75rem; border-radius: .375rem; background: rgba(245,166,32,.1); color: var(--primary); font-size: .75rem; font-weight: 700; border: 1px solid rgba(245,166,32,.2); margin-bottom: .875rem; }
    .key-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .625rem; line-height: 1.4; }
    .key-card h3::before { display: none; }
    .key-card p { font-size: .875rem; color: var(--muted); line-height: 1.75; }
    .key-card a { display: inline-flex; align-items: center; gap: .25rem; margin-top: .875rem; font-size: .8125rem; color: rgba(245,166,32,.8); text-decoration: underline; text-underline-offset: 2px; }

    .before-after { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.75rem 0; }
    @media(max-width:640px) { .before-after { grid-template-columns: 1fr; } }
    .ba-box { border-radius: .875rem; padding: 1.25rem 1.5rem; }
    .ba-before { background: rgba(239,68,68,.06); border: 1px solid rgba(239,68,68,.2); }
    .ba-after { background: rgba(34,197,94,.06); border: 1px solid rgba(34,197,94,.2); }
    .ba-label { font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-bottom: .75rem; }
    .ba-before .ba-label { color: #f87171; }
    .ba-after .ba-label { color: #4ade80; }
    .ba-box p { font-size: .875rem; color: rgba(240,244,248,.8); line-height: 1.75; font-style: italic; }

    .diag-list { list-style: none; display: flex; flex-direction: column; gap: .75rem; margin: 1.5rem 0; }
    .diag-item { display: flex; gap: 1rem; background: rgba(15,21,37,.5); border: 1px solid var(--border); border-radius: .875rem; padding: 1rem 1.25rem; align-items: flex-start; }
    .diag-check { flex-shrink: 0; width: 1.25rem; height: 1.25rem; border-radius: .25rem; border: 2px solid rgba(245,166,32,.4); margin-top: .15rem; }
    .diag-item p { font-size: .9rem; color: rgba(240,244,248,.85); line-height: 1.75; }
    .diag-item p strong { color: var(--fg); }

    .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 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); }

    .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 { transform: rotate(45deg); }
    .faq-item:has(details[open]) { border-color: rgba(245,166,32,.3); background: var(--card); }
    .faq-a { padding: 1rem 1.5rem 1.5rem; 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); }

    .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 { background: var(--bg); border-top: 1px solid var(--border); padding: 3rem 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; }
    @media(max-width:640px) { .btn-row { flex-direction: column; } .btn { width: 100%; } }

    /* ── 摘要引言 ── */
    .summary-intro { padding: 2.5rem 0 .5rem; }
    .summary-intro p { font-size: 1.05rem; color: rgba(240,244,248,.9); line-height: 2.1; margin-bottom: 1.35rem; }

    /* ── 常見誤判 cards ── */
    .misconception-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.125rem; margin: 1.75rem 0; }
    @media(max-width:640px){ .misconception-grid { grid-template-columns: 1fr; } }
    .misconception-card { background: rgba(239,68,68,.04); border: 1px solid rgba(239,68,68,.18); border-radius: 1rem; padding: 1.375rem 1.5rem; }
    .misconception-label { font-size: .75rem; font-weight: 700; letter-spacing: .07em; color: #f87171; margin-bottom: .625rem; text-transform: uppercase; }
    .misconception-card h3 { font-size: .9375rem; font-weight: 700; color: var(--fg); margin-bottom: .5rem; line-height: 1.4; }
    .misconception-card h3::before { display: none; }
    .misconception-card p { font-size: .875rem; color: var(--muted); line-height: 1.8; }

    /* ── 4 類問題診斷 ── */
    .diagnosis-blocks { display: flex; flex-direction: column; gap: 1.125rem; margin: 1.75rem 0; }
    .diagnosis-block { background: rgba(15,21,37,.55); border: 1px solid var(--border); border-left: 3px solid var(--primary); border-radius: 0 1rem 1rem 0; padding: 1.375rem 1.5rem; }
    .diagnosis-block h3 { font-size: 1rem; font-weight: 700; color: var(--fg); margin-bottom: .625rem; line-height: 1.4; }
    .diagnosis-block h3::before { display: none; }
    .diagnosis-block p { font-size: .9rem; color: rgba(240,244,248,.82); line-height: 1.85; margin-bottom: .5rem; }
    .diagnosis-block p:last-child { margin-bottom: 0; }

    /* ── 第二章更新 ── */
    .chapter2-box { background: linear-gradient(135deg, rgba(245,166,32,.07), rgba(245,166,32,.03)); border: 1px solid rgba(245,166,32,.25); border-radius: 1.25rem; padding: 2rem 2.25rem; margin: 1.75rem 0; }
    .chapter2-box p { font-size: .9625rem; color: rgba(240,244,248,.88); line-height: 1.9; margin-bottom: 1.125rem; }
    .chapter2-box p:last-child { margin-bottom: 0; }

    /* ── 3-layer CTA grid ── */
    .cta-three { background: linear-gradient(to top, rgba(245,166,32,.08), transparent); border-top: 1px solid var(--border); padding: 5rem 0; margin-top: 2rem; }
    .cta-three h2 { text-align: center; margin-bottom: 2.5rem; }
    .cta-cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.25rem; }
    @media(max-width:768px){ .cta-cards { grid-template-columns: 1fr; } }
    .cta-card { background: var(--card); border: 1px solid var(--border); border-radius: 1.25rem; padding: 1.75rem; display: flex; flex-direction: column; }
    .cta-card-title { font-size: 1rem; font-weight: 700; color: var(--fg); margin-bottom: .75rem; line-height: 1.4; }
    .cta-card p { font-size: .875rem; color: var(--muted); line-height: 1.8; flex: 1; margin-bottom: 1.25rem; }
    .cta-card .btn { width: 100%; }

    /* ── 課程資訊框 ── */
    .course-info-box { background: var(--card); border: 1px solid rgba(245,166,32,.3); border-radius: 1.25rem; padding: 1.75rem 2rem; margin: 3rem 0 2rem; }
    .course-info-box h3 { font-size: 1rem; font-weight: 700; color: var(--primary); margin-bottom: 1.25rem; letter-spacing: .02em; }
    .course-info-box h3::before { display: none; }
    .course-info-list { list-style: none; margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: .625rem; }
    .course-info-list li { font-size: .9rem; color: rgba(240,244,248,.85); line-height: 1.6; }
    .course-info-list li strong { color: var(--fg); }
    .course-info-list li .badge-free { display: inline-block; font-size: .7rem; font-weight: 700; padding: .15rem .5rem; border-radius: .3rem; background: rgba(34,197,94,.12); color: #4ade80; border: 1px solid rgba(34,197,94,.25); margin-left: .375rem; }
    .course-info-btns { display: flex; flex-wrap: wrap; gap: .75rem; }
    .course-info-btns .btn { padding: .625rem 1.25rem; font-size: .875rem; }