:root{--bg:#f5f7fa;--card:#fff;--ink:#1b1b1f;--mute:#525a68;--brand:#1d4e89;--brand-2:#0f5f8a;--line:#dfe4ec;--chip:#e8eef6;--focus:#c2410c;--warn:#8a4b00;--err:#9f1c1c}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Heiti TC", sans-serif;line-height:1.7;font-size:16px}
a{color:var(--brand-2)}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-9999px;top:0;background:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:8px;top:8px}
.sr,.offscreen{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;padding:0;margin:-1px}
.offscreen{left:-9999px;top:0}
header.top{background:#fff;border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;gap:8px 14px;min-height:52px;flex-wrap:wrap}
.logo{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:var(--ink);text-decoration:none;font-size:18px;white-space:nowrap;min-height:44px}
.logo .dot{width:20px;height:20px;border-radius:5px;background:var(--brand);box-shadow:inset 0 -7px 0 #f2b33d}
nav.main{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;margin:0 -16px 0 auto;padding-right:16px;max-width:100%}
nav.main::-webkit-scrollbar{display:none}
nav.main a{text-decoration:none;color:var(--mute);padding:10px 8px;border-radius:8px;font-size:15px;white-space:nowrap;min-height:44px;display:inline-flex;align-items:center}
nav.main a[aria-current]{color:var(--brand);background:var(--chip);font-weight:600}
@media (max-width:620px){header.top .wrap{padding-top:2px;gap:0}nav.main{margin:0 -16px;padding:0 12px;width:calc(100% + 32px)}nav.main a{min-height:40px;padding:8px 9px}}
.crumb{font-size:14px;color:var(--mute);margin:-2px 0 -8px;line-height:44px}
.crumb a{color:var(--mute);display:inline-flex;align-items:center;min-height:44px;min-width:44px}
h1{font-size:24px;line-height:1.35;margin:10px 0 4px}
h2{font-size:20px;line-height:1.4;margin:28px 0 8px}
h3{font-size:17px;margin:0 0 4px}
.answer{margin:0 0 10px;font-size:15px;line-height:1.6}
.muted{color:var(--mute)}
/* tool */
.tool{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px;margin-bottom:6px}
.lbl{display:block;font-weight:600;margin:0 0 4px}
textarea{display:block;width:100%;font:inherit;font-size:16px;line-height:1.5;border:1px solid var(--line);border-radius:10px;padding:8px 10px;resize:vertical;min-height:64px;background:#fff;color:var(--ink)}
input[type=search],select{font:inherit;font-size:16px;min-height:44px;border:1px solid var(--line);border-radius:10px;padding:6px 10px;background:#fff;color:var(--ink)}
.qrow{display:flex;flex-wrap:wrap;gap:8px}
.qrow input{flex:1 1 200px;min-width:0}
.row{display:flex;flex-wrap:wrap;gap:4px 12px;align-items:center;margin:8px 0}
.tool button{font:inherit;font-size:15px;min-height:44px;padding:6px 14px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);cursor:pointer}
.tool button.primary{background:var(--brand);color:#fff;border-color:var(--brand);font-weight:600}
.tool button:disabled{opacity:.5;cursor:not-allowed}
.sw{display:inline-flex;align-items:center;gap:6px;min-height:44px;cursor:pointer}
.sw input{width:20px;height:20px;accent-color:var(--brand);margin:0}
.out{background:#f0f5fb;border:1px solid #c9d8ea;border-radius:12px;padding:8px 10px;margin:4px 0 0}
.out .lbl{font-size:14px;color:var(--mute);margin:0}
output{display:block;font-size:17px;line-height:1.5;font-weight:600;overflow-wrap:anywhere;margin:2px 0 8px;font-family:inherit}
output.ml{white-space:pre-line}
.note{margin:8px 0 0;font-size:15px;color:var(--err);font-weight:600}
.warn{margin:8px 0 0;font-size:14px;color:var(--warn)}
.note[hidden],.warn[hidden],[hidden]{display:none!important}
#status{margin:6px 0 0;font-size:14px}
.chips{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:10px}
.chips .muted{font-size:14px}
.tool .chip{font-size:14px;border-radius:999px;background:var(--chip);padding:4px 12px}
.acc{font-size:14px;color:var(--mute);margin:0 0 8px}
.tbl{width:100%;border-collapse:collapse;font-size:15px;background:#fff;margin:10px 0}
.tbl caption{text-align:left;font-weight:600;font-size:14px;color:var(--mute);padding-bottom:4px}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top;overflow-wrap:anywhere}
.tbl th{background:#f0f5fb;font-weight:600}
.tw{overflow-x:auto}
#ptable td:first-child{white-space:nowrap}
.count{margin:6px 0 0;font-size:14px;color:var(--mute)}
.rlist{list-style:none;padding:0;margin:8px 0 0}
.rlist li{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px;border-bottom:1px solid var(--line);padding:4px 0}
.rlist .zh{min-width:7em}
.rlist .en{flex:1;font-weight:600}
.rlist button{min-height:40px;padding:4px 12px}
/* content */
.content section{margin:0}
.content p,.prose p{margin:0 0 10px}
.content ul,.content ol{margin:0 0 10px;padding-left:1.4em}
.xl{margin:16px 0 0}
.faq .qa{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:8px}
.faq .qa p{margin:0}
.related{margin-bottom:28px}
.cards{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr;gap:10px}
.card{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;text-decoration:none;color:var(--ink);height:100%;min-height:44px}
.card:hover{border-color:var(--brand)}
.card .cn{display:block;font-weight:700;color:var(--brand)}
.card .cd{display:block;font-size:14px;color:var(--mute)}
.prose{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px 6px;margin:14px 0 8px}
.prose h2{font-size:18px;margin:16px 0 6px}
footer{border-top:1px solid var(--line);background:#fff;font-size:14px;color:var(--mute);margin-top:24px}
footer .wrap{display:flex;flex-wrap:wrap;gap:4px 16px;align-items:center;padding-top:10px;padding-bottom:10px}
footer a{color:var(--mute);display:inline-flex;align-items:center;min-height:44px}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:10px 16px;border-radius:10px;font-size:15px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:60;max-width:90vw}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
@media (min-width:600px){.cards{grid-template-columns:1fr 1fr}}
@media (min-width:900px){h1{font-size:30px}.answer{font-size:16px}.tool{padding:20px}output{font-size:19px}.cards{grid-template-columns:1fr 1fr 1fr}}
@media (prefers-reduced-motion:reduce){.toast{transition:none}}