:root{--bg:#f5f8fb;--card:#fff;--ink:#14202e;--muted:#5b6b7c;--line:#dbe3ec;--acc:#0e7490;--acc2:#0f766e;--acc-l:#e0f2f7;--ok:#15803d;--ok-l:#dcfce7;--bad:#b91c1c;--bad-l:#fee2e2;--warn:#a16207;--warn-l:#fef9c3;--bg2:#eef3f8;--fs:100%}
*{box-sizing:border-box}
html{font-size:var(--fs)}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;-webkit-text-size-adjust:100%}
a{color:var(--acc)}
.site-credit{font-size:.75rem;line-height:1.35;color:var(--muted);text-align:center;padding:.35rem .75rem;background:#fff;border-bottom:1px solid var(--line)}
header.top{background:linear-gradient(135deg,#0e7490,#0f766e);color:#fff;padding:.7rem 1rem}
.top-in{max-width:1100px;margin:0 auto;display:flex;gap:.7rem;align-items:center;flex-wrap:wrap}
.brand{flex:1 1 260px;min-width:0}
.brand h1{font-size:1.15rem;margin:0;line-height:1.25}
.brand .sub{font-size:.8rem;opacity:.9}
.ctrls{display:flex;gap:.4rem;align-items:center;flex-wrap:wrap}
.ctrls button,#langbar button{background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.4);border-radius:999px;padding:.3rem .7rem;font:inherit;font-size:.85rem;cursor:pointer}
#langbar{display:inline-flex;gap:0;border-radius:999px;overflow:hidden;border:1px solid rgba(255,255,255,.5)}
#langbar button{border:0;border-radius:0}
#langbar button.on{background:#fff;color:var(--acc);font-weight:700}
nav.tabs{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
nav.tabs .in{max-width:1100px;margin:0 auto;display:flex;overflow-x:auto;scrollbar-width:thin}
nav.tabs a{flex:0 0 auto;padding:.65rem .85rem;text-decoration:none;color:var(--muted);font-weight:600;font-size:.92rem;border-bottom:3px solid transparent;white-space:nowrap}
nav.tabs a.on{color:var(--acc);border-bottom-color:var(--acc)}
nav.tabs a .zh{display:inline;margin-left:.3rem;font-size:.8rem}
main{max-width:1100px;margin:0 auto;padding:1rem}
h2{font-size:1.35rem;margin:.4rem 0 .8rem;line-height:1.3}
h3{font-size:1.08rem;margin:.2rem 0 .5rem;line-height:1.35}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem;margin:0 0 1rem;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.grid2{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.zh{display:block;color:#3f5163;font-size:.93em;margin-top:.1rem}
.zh-i{display:inline;color:#3f5163;font-size:.9em;margin-left:.35rem}
.muted{color:var(--muted);font-size:.9rem}
.small{font-size:.82rem}
.pill{display:inline-block;font-size:.75rem;font-weight:700;padding:.1rem .55rem;border-radius:999px;background:var(--acc-l);color:var(--acc)}
.pill.bg{background:var(--warn-l);color:var(--warn)}
.pill.med{background:#fce7f3;color:#9d174d}.pill.acad{background:#ede9fe;color:#5b21b6}
.bgnote{background:var(--warn-l);border:1px dashed #d4a017;border-radius:10px;padding:.6rem .8rem;font-size:.9rem;margin:.6rem 0}
.quote{border-left:4px solid var(--acc);background:var(--acc-l);padding:.7rem 1rem;border-radius:0 10px 10px 0;font-style:italic}
.quote cite{display:block;font-style:normal;font-size:.8rem;color:var(--muted);margin-top:.3rem}
.btn{font:inherit;cursor:pointer;border-radius:999px;padding:.5rem 1rem;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:600}
.btn:hover{border-color:var(--acc)}
.btn.primary{background:var(--acc);border-color:var(--acc);color:#fff}
.btn.ok{background:var(--ok);border-color:var(--ok);color:#fff}
.btn.warn{background:#fff7ed;border-color:#fdba74;color:#9a3412}
.btn.sm{padding:.25rem .65rem;font-size:.85rem}
.btn:disabled{opacity:.5;cursor:default}
.row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}
.spacer{flex:1}
details.sec{background:#fff;border:1px solid var(--line);border-radius:12px;margin:0 0 .6rem;padding:.2rem .9rem}
details.sec summary{cursor:pointer;padding:.6rem 0;list-style:none}
details.sec summary::-webkit-details-marker{display:none}
details.sec summary .t{font-weight:700}
details.sec summary .s{display:block;color:var(--ink);font-size:.95rem;margin-top:.2rem}
details.sec summary .more{font-size:.8rem;color:var(--acc);font-weight:600}
details.sec[open] summary .more{display:none}
details.sec ul{margin:.2rem 0 .8rem;padding-left:1.2rem}
details.sec li{margin:.35rem 0}
.tbl{width:100%;border-collapse:collapse;font-size:.93rem}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:.45rem .5rem;text-align:left;vertical-align:top}
.tbl th{background:var(--bg2)}
.nums{display:grid;gap:.7rem;grid-template-columns:repeat(auto-fill,minmax(170px,1fr))}
.num{background:var(--acc-l);border-radius:12px;padding:.7rem}
.num b{display:block;font-size:1.5rem;color:var(--acc)}
.chips{display:flex;gap:.35rem;flex-wrap:wrap;margin:.3rem 0 .8rem}
.chip{font:inherit;font-size:.85rem;border:1px solid var(--line);background:#fff;border-radius:999px;padding:.25rem .7rem;cursor:pointer}
.chip.on{background:var(--acc);color:#fff;border-color:var(--acc)}
input[type=text],input[type=search],select,textarea{font:inherit;border:1px solid var(--line);border-radius:10px;padding:.5rem .7rem;background:#fff;color:var(--ink);max-width:100%}
textarea{width:100%;min-height:90px}
.vcard .w{font-size:1.15rem;font-weight:800;color:var(--acc2)}
.vcard .ex{background:var(--bg2);border-radius:8px;padding:.45rem .6rem;margin-top:.4rem;font-size:.93rem}
.say{border:0;background:var(--acc-l);border-radius:999px;width:2rem;height:2rem;cursor:pointer;font-size:1rem;vertical-align:middle}
/* flashcards */
.fc-wrap{perspective:1200px;max-width:640px;margin:0 auto}
.fc{position:relative;width:100%;min-height:260px;cursor:pointer;transition:transform .45s;transform-style:preserve-3d}
.fc.flip{transform:rotateY(180deg)}
.fc .face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:18px;border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1.2rem;text-align:center;box-shadow:0 6px 18px rgba(14,116,144,.12);overflow:auto}
.fc .back{transform:rotateY(180deg);background:#f0fdfa}
.fc .front .big{font-size:1.7rem;font-weight:800;color:var(--acc2)}
.fc .hint{position:absolute;bottom:.5rem;font-size:.75rem;color:var(--muted)}
.bar{height:10px;background:var(--bg2);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--ok)}
/* quiz */
.qopt{display:block;width:100%;text-align:left;font:inherit;padding:.7rem .9rem;margin:.4rem 0;border:2px solid var(--line);border-radius:12px;background:#fff;cursor:pointer}
.qopt:hover:not(:disabled){border-color:var(--acc)}
.qopt.right{border-color:var(--ok);background:var(--ok-l)}
.qopt.wrong{border-color:var(--bad);background:var(--bad-l)}
.qopt:disabled{cursor:default}
.why{background:var(--bg2);border-radius:10px;padding:.6rem .8rem;margin-top:.5rem}
.score{font-size:2.2rem;font-weight:800;color:var(--acc)}
/* diagrams */
.flow{display:flex;flex-direction:column;align-items:stretch;gap:.4rem}
.flow .box{border-radius:12px;padding:.7rem .9rem;border:2px solid}
.flow .prob{background:var(--bad-l);border-color:#fca5a5;text-align:center}
.flow .arrow{text-align:center;font-size:1.4rem;color:var(--muted);line-height:1}
.flow .cols{display:grid;gap:.6rem;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.flow .cause{background:#fff7ed;border-color:#fdba74}
.flow .sol{background:var(--ok-l);border-color:#86efac}
.flow ul{margin:.3rem 0 0;padding-left:1.1rem;font-size:.9rem}
svg{max-width:100%;height:auto;display:block}
svg text{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans TC","PingFang TC",sans-serif}
.cmp th{width:22%}
/* modal */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.55);display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem}
.modal .box{background:#fff;border-radius:16px;max-width:460px;width:100%;padding:1.2rem 1.3rem;max-height:92vh;overflow:auto}
.modal label{display:block;font-weight:600;margin:.6rem 0 .2rem}
.modal input{width:100%}
.err{color:var(--bad);font-size:.9rem}
.toast{position:fixed;left:50%;bottom:1rem;transform:translateX(-50%);background:#0f172a;color:#fff;padding:.5rem 1rem;border-radius:999px;font-size:.9rem;z-index:200;opacity:0;transition:opacity .3s;pointer-events:none}
.toast.show{opacity:.95}
footer.foot{text-align:center;color:var(--muted);font-size:.82rem;padding:1.5rem 1rem 2rem;border-top:1px solid var(--line);background:#fff;margin-top:1.5rem}
footer.foot .credit{font-weight:700;color:var(--ink);margin-bottom:.35rem}
footer.foot .src{max-width:760px;margin:0 auto}
.timer{font-size:2rem;font-weight:800;font-variant-numeric:tabular-nums;color:var(--acc)}
.subtabs{display:flex;gap:.35rem;flex-wrap:wrap;margin-bottom:1rem}
.hidden{display:none!important}
@media (max-width:600px){
  main{padding:.7rem}
  .card{padding:.85rem}
  h2{font-size:1.2rem}
  .brand h1{font-size:1rem}
  .fc{min-height:300px}
}
@media print{nav.tabs,.ctrls,.say{display:none}}
/* pipeline + timeline (HTML diagrams) */
.pipe{position:relative;padding-left:1.4rem;border-left:14px solid #0e7490;border-radius:10px}
.pstage{margin:0 0 1rem;position:relative}
.pstage::before{content:"";position:absolute;left:-1.95rem;top:2.4rem;width:12px;height:18px;border-radius:50% 50% 50% 50%/60% 60% 40% 40%;background:#f87171}
.pstage.big::before{background:#dc2626;width:16px;height:24px;left:-2.05rem}
.pstage:last-of-type::before{display:none}
.pname{font-weight:800;color:#0e7490;font-size:1.05rem;margin-bottom:.35rem;display:flex;align-items:center;gap:.45rem;flex-wrap:wrap}
.pnum{display:inline-flex;align-items:center;justify-content:center;width:1.6rem;height:1.6rem;border-radius:50%;background:#0e7490;color:#fff;font-size:.85rem}
.pcards{display:grid;gap:.5rem;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.pleak{background:var(--bad-l);border:1.5px solid #fca5a5;border-radius:10px;padding:.5rem .7rem;font-size:.93rem}
.pstage.big .pleak{border:3px solid #dc2626}
.pleak b{color:#b91c1c}.pfix b{color:#15803d}
.pfix{background:var(--ok-l);border:1.5px solid #86efac;border-radius:10px;padding:.5rem .7rem;font-size:.93rem}
.ploop{background:#ccfbf1;border:1.5px dashed #0f766e;border-radius:10px;padding:.5rem .7rem;font-weight:600;color:#115e59}
.tline{list-style:none;margin:0;padding:0 0 0 1.4rem;border-left:4px solid #0e7490}
.tline li{position:relative;margin:0 0 1rem;padding-left:.4rem}
.tline li::before{content:"";position:absolute;left:calc(-1.4rem - 13px);top:.25rem;width:16px;height:16px;border-radius:50%;background:#0e7490;border:3px solid #fff;box-shadow:0 0 0 2px #0e7490}
.tline li.warn::before{background:#dc2626;box-shadow:0 0 0 2px #dc2626}
.tline li b{color:#0e7490;font-size:1.05rem}.tline li.warn b{color:#dc2626}
.qopt:disabled{color:var(--ink);opacity:1}
header.top .zh-i,header.top .zh,.chip.on .zh-i,.btn.primary .zh-i,.btn.ok .zh-i,.pnum .zh-i{color:inherit;opacity:.85}
.btn.primary .zh,.btn.ok .zh{color:inherit}
.draft-banner{background:#7f1d1d;color:#fff;text-align:center;padding:.4rem .75rem;font-size:.82rem;font-weight:700;border-radius:10px;margin:0 0 .8rem}
.consent-box .draft-banner{margin:-1rem -1.1rem .9rem;border-radius:14px 14px 0 0}
.likert{border-bottom:1px solid var(--line);padding:.7rem 0}
.likert:last-of-type{border-bottom:0}
.lq{font-weight:600;margin-bottom:.35rem}
.lopts{display:flex;flex-direction:column;gap:.2rem}
.lopt{font-size:.9rem;display:flex;gap:.45rem;align-items:flex-start;cursor:pointer}
.field{display:block;margin:.8rem 0}
.field span{display:block;font-weight:600;margin-bottom:.25rem}
.field textarea{width:100%}
@media (min-width:700px){
  .lopts{flex-direction:row;flex-wrap:wrap;gap:.5rem 1rem}
}
.scode{font-size:.75rem;background:var(--bg2);padding:.05rem .35rem;border-radius:6px;margin-right:.25rem;color:var(--acc2)}
.lopts{gap:.15rem .6rem}
.lopt span{font-size:.85rem}