:root{--bg:#f5f7fb;--card:#fff;--ink:#1b1b1f;--mute:#525a68;--brand:#1f3a5f;--brand-2:#0f6e6e;--brand-ink:#fff;--line:#dfe4ec;--chip:#e8eef6;--focus:#c2410c}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html.noscroll{overflow:hidden}
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,.result: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:50%;background:conic-gradient(#F9C74F 0 25%,#90BE6D 0 50%,#8ECAE6 0 75%,#F28482 0);border:2px solid var(--brand)}
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:8px 0 0}
.crumb a{color:var(--mute)}
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:12px}
.tabs{display:flex;gap:8px;margin:0 0 10px}
.tabs button{flex:1;font:inherit;font-weight:600;border:1px solid var(--line);cursor:pointer;color:var(--ink);background:var(--chip);border-radius:999px;padding:6px 12px;min-height:44px}
.tabs button[aria-selected="true"]{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.stage{position:relative;display:flex;flex-direction:column;align-items:center;gap:10px}
.wheelbox{position:relative;width:min(100%,420px,calc(100svh - 330px));min-width:220px;aspect-ratio:1/1;cursor:pointer;padding-top:0}
.tod .wheelbox{width:min(100%,420px,calc(100svh - 385px))}
.wheelbox canvas{display:block;width:100%;height:100%;border-radius:50%;box-shadow:0 0 0 4px var(--brand),0 6px 18px rgba(31,58,95,.18);will-change:transform}
.pointer{position:absolute;left:50%;top:-6px;transform:translateX(-50%);width:0;height:0;border-left:14px solid transparent;border-right:14px solid transparent;border-top:26px solid var(--brand);z-index:2;filter:drop-shadow(0 2px 1px rgba(0,0,0,.25))}
.spin{font:inherit;font-size:18px;font-weight:700;border:0;border-radius:999px;background:var(--brand);color:var(--brand-ink);padding:10px 36px;min-height:48px;min-width:200px;cursor:pointer}
.spin:hover{background:#16304f}
.spin:disabled{background:#8a97a8;cursor:not-allowed}
.result{position:absolute;left:50%;top:50%;transform:translate(-50%,-60%);width:min(92%,380px);background:#fff;border:2px solid var(--brand);border-radius:16px;padding:14px;box-shadow:0 10px 30px rgba(0,0,0,.22);z-index:5;text-align:center}
.result[hidden]{display:none}
.result .rt{margin:0 0 10px;font-size:18px;overflow-wrap:anywhere}
.result strong{font-size:24px;color:var(--brand);display:block;line-height:1.35}
.result.fade{animation:fade .3s ease-out}
@keyframes fade{from{opacity:0}to{opacity:1}}
.row,.opts{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.row{justify-content:center}
.tool button:not(.spin):not(.chip):not([role="tab"]),.numrow input{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)!important;color:#fff!important;border-color:var(--brand)!important}
.tool button:disabled{opacity:.5;cursor:not-allowed}
.panel{margin-top:14px}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}
.chip{font:inherit;font-size:14px;min-height:44px;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--chip);color:var(--ink);cursor:pointer}
.chip:hover{border-color:var(--brand)}
.numrow{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 10px}
.numrow[hidden]{display:none}
.numrow input{width:96px;cursor:text}
.lbl{display:block;font-weight:600;margin-bottom: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:150px;background:#fff;color:var(--ink)}
.tp[hidden]{display:none}
.count{margin:6px 0 0;font-size:14px;color:var(--mute)}
.note{margin:6px 0 0;font-size:14px;color:#9a3412;font-weight:600}
.note[hidden]{display:none}
.opts{margin-top:10px}
.sw{display:inline-flex;align-items:center;gap:8px;min-height:44px;cursor:pointer;padding-right:6px}
.sw input{width:22px;height:22px;accent-color:var(--brand);margin:0}
.hist{margin-top:14px;border-top:1px dashed var(--line);padding-top:10px}
.hh{font-weight:600;margin:0}
.hist ol{margin:6px 0 0;padding-left:1.6em;max-height:180px;overflow:auto}
.hist ol:empty{display:none}
.hist .muted{font-size:14px;margin:4px 0 0}
/* fullscreen */
.tool:fullscreen{overflow:auto;border-radius:0;border:0;padding:16px}
.tool.fsx{position:fixed;inset:0;z-index:50;border-radius:0;border:0;overflow:auto;margin:0;padding:16px}
.tool:fullscreen .wheelbox,.tool.fsx .wheelbox{width:min(92vw,calc(100vh - 150px),640px)}
/* 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}
.pills{list-style:none;padding:0!important;display:flex;flex-wrap:wrap;gap:6px}
.pills li{background:#fff;border:1px solid var(--line);border-radius:999px;padding:2px 12px;font-size:15px}
.xlinks li{margin-bottom:4px}
.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{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:20px;padding:20px}
.tool .tabs{grid-column:1/-1;margin:0;max-width:420px}
.panel{margin-top:0}
.wheelbox{width:min(100%,440px)}
.tod .wheelbox{width:min(100%,440px)}
.cards{grid-template-columns:1fr 1fr}
}
@media (prefers-reduced-motion:reduce){.toast{transition:none}}