.kepu-intro { max-width: 760px; margin: 0 auto 56px; text-align: center; }
    .kepu-intro h1 { font-size: clamp(32px, 4.4vw, 48px); font-weight: 700; letter-spacing: -.02em; line-height: 1.2; }
    .kepu-intro p { margin-top: 18px; color: var(--ink-soft); font-size: 17px; }
    .kepu-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .kepu-card {
      background: var(--white);
      border: 1px solid var(--line-soft);
      border-radius: var(--radius);
      padding: 30px 28px;
      box-shadow: var(--shadow-sm);
      transition: transform .25s ease, box-shadow .25s ease;
    }
    .kepu-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
    .kepu-card h3 { font-size: 19px; font-weight: 700; letter-spacing: -.01em; }
    .kepu-card p { margin-top: 10px; font-size: 14.5px; color: var(--ink-soft); }
    .kepu-card .kepu-tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .1em; color: var(--accent-dark); background: var(--accent-soft); padding: 5px 12px; border-radius: 999px; margin-bottom: 14px; }
    .grade-table { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 14px; }
    .grade-table th, .grade-table td { padding: 11px 14px; border-bottom: 1px solid var(--line-soft); text-align: left; }
    .grade-table thead th { font-size: 12px; color: var(--ink-faint); font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
    .grade-table .best { color: var(--accent-dark); font-weight: 700; }
    .kepu-note { margin-top: 28px; background: var(--paper); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 24px 26px; }
    .kepu-note h4 { font-size: 16px; font-weight: 700; }
    .kepu-note ul { margin-top: 10px; }
    .kepu-note li { display: flex; gap: 10px; padding: 8px 0; font-size: 14.5px; color: var(--ink-soft); border-bottom: 1px dashed var(--line-soft); }
    .kepu-note li::before { content: "✓"; color: var(--accent-dark); font-weight: 700; }
    .cta-band { text-align: center; }
    .cta-band h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 700; letter-spacing: -.02em; }
    .cta-band p { margin-top: 14px; color: var(--ink-soft); }
    .cta-band .btn { margin-top: 26px; }
    .compare-bars { margin-top: 24px; background: var(--white); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 24px; }
    .kepu-tag.best { background: var(--ink); color: #fff; }
    .compare-bars h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
    .compare-bars .hint { font-size: 13px; color: var(--ink-faint); margin-bottom: 14px; }
    .bar-row { display: flex; align-items: center; gap: 14px; margin: 14px 0; }
    .bar-label { width: 52px; font-weight: 700; font-size: 14px; flex: none; }
    .bar-track { flex: 1; background: var(--paper); border-radius: 999px; height: 26px; overflow: hidden; }
    .bar-fill { height: 100%; border-radius: 999px; }
    .bar-fill.e1 { width: 100%; background: #b6b6b6; }
    .bar-fill.e0 { width: 40%; background: #7ea08f; }
    .bar-fill.enf { width: 20%; background: var(--ink); }
    .bar-value { width: 96px; flex: none; text-align: right; font-size: 13px; color: var(--ink-soft); }
    .layers { margin-top: 16px; }
    .layer { display: flex; align-items: center; gap: 12px; border-radius: 12px; padding: 14px 18px; margin: 10px 0; color: #fff; font-weight: 600; }
    .layer.l1 { background: #2f6d8f; }
    .layer.l2 { background: #3f8a9f; }
    .layer.l3 { background: #4fa7b8; }
    .layer .num { width: 30px; height: 30px; flex: none; border-radius: 50%; background: rgba(255, 255, 255, .25); display: flex; align-items: center; justify-content: center; font-size: 14px; }
    .layer .note { margin-left: auto; font-weight: 400; font-size: 13px; color: rgba(255, 255, 255, .92); }
    .layer-badge { display: inline-flex; align-items: center; gap: 8px; margin-top: 12px; font-size: 13px; font-weight: 600; color: var(--accent-dark); background: var(--accent-soft); padding: 8px 15px; border-radius: 999px; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 16px; }
    .step { position: relative; background: var(--white); border: 1px solid var(--line-soft); border-radius: 14px; padding: 22px 16px; text-align: center; }
    .step .snum { width: 34px; height: 34px; margin: 0 auto 12px; border-radius: 50%; background: var(--ink); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; }
    .step h5 { font-size: 15px; font-weight: 700; }
    .step p { font-size: 13px; color: var(--ink-soft); margin-top: 6px; }
    .step:not(:last-child)::after { content: "→"; position: absolute; right: -11px; top: 38px; color: var(--ink-faint); font-size: 18px; }
    .concern-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .concern-col { border-radius: var(--radius); padding: 24px; }
    .concern-col.bad { background: #f6efed; border: 1px solid #ecd6d0; }
    .concern-col.good { background: var(--paper); border: 1px solid var(--line-soft); }
    .concern-col h4 { font-size: 16px; font-weight: 700; }
    .concern-col ul { margin-top: 12px; }
    .concern-col li { display: flex; gap: 9px; padding: 7px 0; font-size: 14.5px; border-bottom: 1px dashed var(--line-soft); }
    .concern-col.bad li::before { content: "✗"; color: #c0553f; font-weight: 700; }
    .concern-col.good li::before { content: "✓"; color: var(--accent-dark); font-weight: 700; }
    .board-compare { display: grid; grid-template-columns: 1fr; gap: 14px; margin-top: 24px; }
    .board-card { background: var(--white); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 24px; }
    .board-card h4 { font-size: 16px; font-weight: 700; }
    .board-card .sub { font-size: 13px; color: var(--ink-faint); margin-bottom: 16px; }
    details.board-card { padding: 0; overflow: hidden; }
    details.board-card summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 12px; padding: 22px 24px; }
    details.board-card summary::-webkit-details-marker { display: none; }
    details.board-card summary::after { content: "＋"; color: var(--ink-faint); font-size: 20px; margin-left: auto; }
    details.board-card[open] summary::after { content: "－"; }
    details.board-card[open] summary { border-bottom: 1px solid var(--line-soft); }
    .board-title { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 700; }
    .board-sub { font-size: 13px; color: var(--ink-faint); font-weight: 400; }
    .inline-badge { font-size: 11px; font-weight: 700; color: #fff; background: var(--ink); padding: 4px 10px; border-radius: 999px; letter-spacing: .04em; }
    .board-body { padding: 22px 24px; }
    .cross { display: flex; flex-direction: column; gap: 4px; }
    .cross .layer-top, .cross .layer-bot { height: 16px; border-radius: 4px; background: #e8e2d6; }
    .cross .core { min-height: 68px; border-radius: 4px; border: 1px solid var(--line-soft); display: flex; align-items: center; justify-content: center; color: var(--ink-faint); font-size: 12px; }
    .cross .core.particle { background: radial-gradient(circle at 3px 3px, #cfc6b2 1.6px, transparent 1.6px) 0 0 / 12px 12px, #f2ede1; }
    .cross .core.ply { background: repeating-linear-gradient(180deg, #efe8d8 0 7px, #d8cdb4 7px 9px, #e3dcca 9px 16px); }
    .cross .core.block { background: repeating-linear-gradient(90deg, #ede4d2 0 8px, #d9c9ad 8px 11px); }
    .cross .core.mdf { background: repeating-linear-gradient(0deg, #efe9dc 0 4px, #e6dfd0 4px 7px); }
    /* ---- 板材橫截面動效 ---- */
    .board-card { transition: transform .35s var(--m-ease, cubic-bezier(.16,1,.3,1)), box-shadow .35s ease, border-color .35s ease; }
    .board-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--line); }
    .cross { overflow: hidden; }
    .cross .layer-top, .cross .layer-bot { position: relative; overflow: hidden; }
    .cross .layer-top::after, .cross .layer-bot::after {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(100deg, transparent 30%, rgba(255,255,255,.6) 50%, transparent 70%);
      transform: translateX(-130%);
    }
    details.board-card[open] .cross { animation: bxBuild .6s var(--m-ease, cubic-bezier(.16,1,.3,1)) both; }
    details.board-card[open] .cross .layer-top::after,
    details.board-card[open] .cross .layer-bot::after { animation: bxSheen 2.4s var(--m-ease, cubic-bezier(.16,1,.3,1)) .25s; }
    details.board-card[open] .cross .core.particle { animation: bxParticle 7s linear infinite; }
    details.board-card[open] .cross .core.ply { animation: bxPly 3.4s linear infinite; }
    details.board-card[open] .cross .core.block { animation: bxBlock 3.8s linear infinite; }
    details.board-card[open] .cross .core.mdf { animation: bxMdf 2.8s linear infinite; }
    @keyframes bxBuild { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
    @keyframes bxSheen { to { transform: translateX(130%); } }
    @keyframes bxParticle { to { background-position: 12px 12px; } }
    @keyframes bxPly { to { background-position: 0 16px; } }
    @keyframes bxBlock { to { background-position: 11px 0; } }
    @keyframes bxMdf { to { background-position: 0 7px; } }
    @media (prefers-reduced-motion: reduce) {
      details.board-card[open] .cross,
      details.board-card[open] .cross .core,
      details.board-card[open] .cross .layer-top::after,
      details.board-card[open] .cross .layer-bot::after { animation: none !important; }
      .board-card { transition: none; }
    }
    .board-notes { margin-top: 14px; font-size: 12.5px; color: var(--ink-soft); line-height: 1.6; }
    .form-time { margin-top: 24px; background: var(--white); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 24px; }
    .form-time h4 { font-size: 15px; font-weight: 700; }
    .form-time .sub { font-size: 13px; color: var(--ink-faint); margin-bottom: 8px; }
    .form-time svg { width: 100%; height: auto; max-height: 200px; }
    .form-time .cap { font-size: 12.5px; color: var(--ink-faint); margin-top: 8px; }
    .new-mats { margin-top: 22px; background: var(--paper); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 22px 24px; }
    .new-mats h4 { font-size: 15px; font-weight: 700; }
    .new-mats ul { margin-top: 10px; }
    .new-mats li { display: flex; gap: 10px; padding: 7px 0; font-size: 14px; color: var(--ink-soft); border-bottom: 1px dashed var(--line-soft); }
    .new-mats li::before { content: "◆"; color: var(--accent-dark); }
    .helper { display: grid; gap: 18px; }
    .qblock { background: var(--white); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 20px 22px; }
    .qblock .qtitle { font-size: 14.5px; font-weight: 700; margin-bottom: 12px; }
    .chips, .opts { display: flex; flex-wrap: wrap; gap: 10px; }
    .chip-check, .opt-check { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--white); border-radius: 999px; padding: 9px 16px; font-size: 14px; cursor: pointer; transition: background .2s ease, color .2s ease, border-color .2s ease; }
    .chip-check input, .opt-check input { accent-color: var(--ink); }
    .chip-check:has(input:checked), .opt-check:has(input:checked) { background: var(--ink); color: #fff; border-color: var(--ink); }
    .helper-actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
    .helper-result { margin-top: 16px; background: var(--paper); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 22px 24px; }
    .helper-result h4 { font-size: 15px; font-weight: 700; }
    .helper-result ul { margin-top: 12px; }
    .helper-result li { display: flex; gap: 10px; padding: 8px 0; font-size: 14.5px; border-bottom: 1px dashed var(--line-soft); }
    .helper-result li::before { content: "✓"; color: var(--accent-dark); font-weight: 700; }
    .helper-result .why { margin-top: 12px; font-size: 13px; color: var(--ink-faint); }
    html { scroll-behavior: smooth; scroll-padding-top: 84px; }
    .kepu-topics { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 24px; }
    .kepu-topics a { border: 1px solid var(--line); background: var(--white); border-radius: 999px; padding: 9px 18px; font-size: 13.5px; font-weight: 500; color: var(--ink-soft); transition: background .2s ease, color .2s ease, border-color .2s ease; }
    .kepu-topics a:hover { background: var(--ink); color: #fff; border-color: var(--ink); }
    .kepu-back { margin-top: 18px; font-size: 14px; color: var(--ink-faint); }
    .kepu-back a { color: var(--accent-dark); font-weight: 600; }
    .kepu-card { position: relative; }
    .kepu-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent), transparent); opacity: .8; border-radius: var(--radius) var(--radius) 0 0; }
    .tl { margin-top: 8px; }
    .tl-row { display: grid; grid-template-columns: 120px 1fr 150px; gap: 14px; align-items: center; margin: 14px 0; }
    .tl-name { font-weight: 700; font-size: 14.5px; }
    .tl-track { position: relative; background: var(--paper); border-radius: 999px; height: 26px; }
    .tl-bar { position: absolute; left: 0; top: 0; height: 100%; border-radius: 999px; background: var(--ink); color: #fff; font-size: 12px; font-weight: 600; display: flex; align-items: center; padding: 0 12px; width: var(--w); }
    .tl-dot { position: absolute; top: 50%; right: -5px; transform: translateY(-50%); width: 16px; height: 16px; border-radius: 50%; background: var(--accent); border: 3px solid #fff; }
    .tl-milestone { font-size: 13px; color: var(--ink-soft); }
    .tl-note { margin-top: 12px; font-size: 12.5px; color: var(--ink-faint); }
    @media (max-width: 768px) { .kepu-grid { grid-template-columns: 1fr; } }
    @media (max-width: 768px) { .steps { grid-template-columns: 1fr 1fr; } .concern-grid { grid-template-columns: 1fr; } .board-compare { grid-template-columns: 1fr; } .tl-row { grid-template-columns: 96px 1fr; } .tl-milestone { grid-column: 2; } }
    html.theme-dark {
      .kepu-tag.best, .inline-badge, .t-badge, .featured-badge { background: #f5f5f7; color: #1d1d1f; }
      .chip-check:has(input:checked), .opt-check:has(input:checked) { background: #f5f5f7; color: #1d1d1f; border-color: #f5f5f7; }
      .chip-check:has(input:checked) input, .opt-check:has(input:checked) input { accent-color: #1d1d1f; }
      .concern-col.bad { background: #2a211e; border-color: #3d2a26; }
      .concern-col.good { background: #1f1f21; }
      .kepu-card, .form-time, .compare-bars, .qblock, .layer-badge { background: #1c1c1e; }
      .board-card, .tl-note { background: #1c1c1e; }
      summary, .board-body, .helper-result { background: #1c1c1e; }
      .bar-track, .tl-track, .kepu-topics a { background: #1f1f21; }
      .kepu-topics a { border-color: #3a3a3c; color: var(--ink-soft); }
      .kepu-topics a:hover { background: #f5f5f7; color: #1d1d1f; border-color: #f5f5f7; }
      .cross .core { color: var(--ink-soft); }
    }

    /* 實拍相簿 + 燈箱 */
    .proof-head { text-align: center; margin-top: 30px; }
    .proof-head h4 { font-size: 18px; font-weight: 700; }
    .proof-head p { font-size: 13.5px; color: var(--ink-faint); margin-top: 4px; }
    .proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
    .proof-item { position: relative; background: var(--white); border: 1px solid var(--line-soft); border-radius: 16px; overflow: hidden; cursor: pointer; transition: transform .25s ease, box-shadow .25s ease; }
    .proof-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .proof-item img { width: 100%; aspect-ratio: 3 / 4; object-fit: cover; display: block; }
    .proof-item figcaption { padding: 12px 14px 14px; font-size: 13px; color: var(--ink-soft); background: var(--white); }
    .proof-item .zoom { position: absolute; top: 10px; right: 10px; width: 28px; height: 28px; border-radius: 50%; background: rgba(0,0,0,.4); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 15px; backdrop-filter: blur(4px); }
    .proof-lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.92); display: none; align-items: center; justify-content: center; z-index: 999; padding: 24px; }
    .proof-lightbox.open { display: flex; }
    .proof-lightbox img { max-width: min(92vw, 900px); max-height: 82vh; border-radius: 12px; }
    .proof-lightbox .lb-cap { position: absolute; bottom: 20px; left: 0; right: 0; text-align: center; color: #f5f5f7; font-size: 14px; }
    .proof-lightbox .lb-close { position: absolute; top: 18px; right: 22px; color: #fff; font-size: 30px; line-height: 1; cursor: pointer; background: none; border: none; }
    @media (max-width: 768px) { .proof-grid { grid-template-columns: 1fr 1fr; } }
    @media (max-width: 480px) { .proof-grid { grid-template-columns: 1fr; } }

    /* 合作品牌牆 */
    .brand-head { text-align: center; margin-top: 32px; }
    .brand-head h4 { font-size: 18px; font-weight: 700; }
    .brand-head p { font-size: 13.5px; color: var(--ink-faint); margin-top: 4px; }
    .brand-wall { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 20px; }
    .brand-item { display: flex; flex-direction: column; align-items: center; justify-content: center; min-width: 132px; background: var(--white); border: 1px solid var(--line-soft); border-radius: 16px; padding: 18px 20px; box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease; }
    .brand-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .brand-mark { font-size: 17px; font-weight: 800; letter-spacing: .01em; color: var(--ink); line-height: 1.15; text-align: center; }
    .brand-cat { margin-top: 6px; font-size: 11.5px; font-weight: 600; color: var(--ink-faint); letter-spacing: .04em; }
    @media (max-width: 560px) { .brand-item { min-width: 108px; padding: 15px 14px; } .brand-mark { font-size: 15.5px; } }

    /* 合作品牌 logo 牆 */
    .logo-wall { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 20px; }
    .logo-item { display: flex; flex-direction: column; align-items: center; justify-content: center; width: 156px; background: #ffffff; border: 1px solid #e8e8ed; border-radius: 16px; padding: 16px 14px 12px; box-shadow: 0 2px 10px rgba(0,0,0,.05); transition: transform .2s ease, box-shadow .2s ease; }
    .logo-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .logo-item img { height: 48px; max-width: 116px; object-fit: contain; display: block; }
    .logo-item .brand-cat { margin-top: 10px; font-size: 11.5px; font-weight: 600; color: #6e6e73; letter-spacing: .04em; }
    @media (max-width: 560px) { .logo-item { width: 130px; } .logo-item img { height: 42px; max-width: 96px; } }