:root{--bg:#f8fafc;--card:#fff;--fg:#0f172a;--mut:#64748b;--line:#e2e8f0;--acc:#2563eb;--cheap:#16a34a;--mid:#eab308;--exp:#dc2626;color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--card:#131c2e;--fg:#e5e7eb;--mut:#94a3b8;--line:#243047;--acc:#60a5fa;--cheap:#22c55e;--mid:#facc15;--exp:#f87171}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;max-width:760px;margin:0 auto}
h1{font-size:1.3rem;margin:0}h2{font-size:1.05rem;margin:0 0 8px}
main{max-width:760px;margin:0 auto;padding:0 12px 24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 16px;margin:0 0 12px}
.now{text-align:center;cursor:pointer}
.now .big{font-size:3.4rem;font-weight:800;letter-spacing:-1px;line-height:1.1;margin:4px 0}
.now .big small{font-size:1rem;font-weight:500;color:var(--mut)}
.now.cheap .big span{color:var(--cheap)}.now.mid .big span{color:var(--mid)}.now.exp .big span{color:var(--exp)}
.label,.sub{color:var(--mut)}.hint{font-size:.8rem}
.row{display:flex;gap:8px;align-items:center}.between{justify-content:space-between}.end{justify-content:flex-end}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{border:0;background:transparent;color:var(--fg);padding:6px 12px;font:inherit;font-size:.9rem}
.seg button.on{background:var(--acc);color:#fff}
button.icon{background:transparent;border:0;color:var(--fg);font-size:1.3rem;padding:6px;cursor:pointer}
button.primary{background:var(--acc);color:#fff;border:0;border-radius:10px;padding:8px 18px;font:inherit}
.legend{font-size:.8rem;color:var(--mut);margin:4px 0 6px}
.dot{display:inline-block;width:10px;height:10px;border-radius:3px;margin:0 4px 0 8px;vertical-align:-1px}
.dot.cheap{background:var(--cheap)}.dot.mid{background:var(--mid)}.dot.exp{background:var(--exp)}
.chartwrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
#chart{display:block;height:220px}
#chart .b{cursor:pointer}#chart .b.cheap{fill:var(--cheap)}#chart .b.mid{fill:var(--mid)}#chart .b.exp{fill:var(--exp)}
#chart .b.past{opacity:.35}#chart .b.sel{stroke:var(--fg);stroke-width:1.5}
#chart text{fill:var(--mut);font-size:10px}#chart .grid{stroke:var(--line)}#chart .nowline{stroke:var(--acc);stroke-width:2}
#chart .daysep{stroke:var(--mut);stroke-dasharray:3 3}
.note{color:var(--mut);font-style:italic;margin:8px 0 0}.small{font-size:.8rem}
.stats{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.85rem;color:var(--mut);margin-top:8px}
.stats b{color:var(--fg)}
table.bd{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
table.bd td{padding:6px 0;border-bottom:1px solid var(--line)}table.bd td:last-child{text-align:right}
table.bd tr.tot td{font-weight:700;border-bottom:0}
.form{display:grid;gap:10px}
.form label{display:grid;gap:4px;font-size:.9rem;color:var(--mut)}
.form label.check{display:flex;gap:8px;align-items:center;color:var(--fg)}
.form input[type=number],.form input[type=time],.form select{font:inherit;padding:8px 10px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);width:100%}
fieldset.radio{border:0;padding:0;margin:0;display:flex;gap:16px;flex-wrap:wrap}fieldset.radio legend{font-size:.9rem;color:var(--mut);margin-bottom:4px}
fieldset.radio label{display:flex;gap:6px;color:var(--fg)}
.result{margin-top:10px;font-size:.95rem}.result .big2{font-size:1.4rem;font-weight:700}
.result ul{margin:6px 0 0;padding-left:18px}
dialog{border:1px solid var(--line);border-radius:16px;background:var(--card);color:var(--fg);width:min(92vw,420px)}
dialog::backdrop{background:rgba(0,0,0,.45)}
hr{border:0;border-top:1px solid var(--line);width:100%}
.foot{font-size:.75rem;color:var(--mut);text-align:center}
.err{color:var(--exp)}
.chartbox{display:flex;align-items:flex-start}
#yaxis{flex:0 0 34px;height:220px;width:34px}#yaxis text{fill:var(--mut);font-size:10px}
.chartbox .chartwrap{flex:1 1 auto;min-width:0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.carrow{border:1px solid var(--line);border-radius:12px;padding:10px;display:grid;gap:8px}
.carrow b{font-size:.95rem;color:var(--fg)}
.carres{border-top:1px solid var(--line);padding-top:8px;margin-top:8px}
.mt6{margin-top:6px}
[hidden]{display:none!important}
#chart .b.fc{fill-opacity:.38;stroke-dasharray:2 2;stroke-width:1}
#chart .b.fc.cheap{stroke:var(--cheap)}#chart .b.fc.mid{stroke:var(--mid)}#chart .b.fc.exp{stroke:var(--exp)}
#chart .fcsep{stroke:var(--fg);stroke-width:1.2;stroke-dasharray:5 3}
#chart .fclbl{font-weight:700;fill:var(--fg)}
.dot.fcdot{background:transparent;border:1.5px dashed var(--mut)}
.prelim{margin-top:8px;padding:8px 10px;border-radius:10px;border:1px dashed var(--mid);background:color-mix(in srgb,var(--mid) 14%,transparent);font-weight:600}
.fctag{font-size:.75rem;padding:1px 6px;border-radius:8px;border:1px dashed var(--mut);color:var(--mut)}
.fcnote a,#fcAttr a,#foot a,.bd a{color:inherit;text-decoration:underline}