@layer reset,tokens,base,layout,components,states,print;@layer reset{*,*:before,*:after{box-sizing:border-box}html{color-scheme:light dark}body,h1,h2,h3,p,figure,dl,dd,ol,ul{margin:0}ol,ul{padding:0}button,input,select{font:inherit}button{border:0}img,svg{display:block;max-inline-size:100%}[hidden]{display:none!important}}@layer tokens{:root{--paper: #f4f6f7;--surface: #ffffff;--surface-sunk: #eaeef0;--ink: #151a1e;--ink-soft: #5a666e;--line: #d3dade;--line-control: #6f7c84;--mark: #243ca6;--mark-hover: #1b2e86;--mark-soft: #e4e8f8;--band-violet: #eee9ff;--band-blue: #e3efff;--band-cyan: #ddf4f4;--band-green: #e1f3e8;--band-lime: #edf4d8;--band-yellow: #fbf1c8;--band-orange: #fae4cf;--band-red: #f8dddd;--band-rose: #f1e2ef;--notice: #825500;--notice-bg: #fdf3dc;--danger: #a32319;--danger-bg: #fce9e7;--ok: #1a6b45;--ok-bg: #e9f6ef;--inverse: #ffffff;--backdrop: rgb(21 26 30 / .55);--shadow: 0 1px 2px rgb(21 26 30 / .06), 0 1px 8px rgb(21 26 30 / .04);--font-ui: ui-sans-serif, system-ui, 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base{html{min-inline-size:320px;background:var(--paper)}body{min-block-size:100vh;background:var(--paper);color:var(--ink);font-family:var(--font-ui);font-size:16px;line-height:1.55;text-rendering:optimizeLegibility}a{color:var(--mark);text-underline-offset:3px}button,summary,select,input{color:inherit}button,summary{cursor:pointer}input,select{font-variant-numeric:tabular-nums}h1,h2,h3{line-height:1.15;letter-spacing:-.02em}h1{font-size:clamp(1.55rem,3vw,1.9rem)}h2{font-size:1.2rem}h3{font-size:1rem}:focus-visible{outline:none;box-shadow:0 0 0 2px var(--surface),0 0 0 5px var(--ink);border-radius:var(--r-sm)}::selection{background:var(--mark-soft);color:var(--ink)}}@layer layout{.site-header{inline-size:min(1180px,calc(100% - 32px));block-size:58px;margin-inline:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;border-block-end:1px solid 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minmax(0,1fr);gap:18px;align-items:center}.refine__grid{display:grid;gap:10px}.sheet__header{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.fit-chart__main{display:grid;grid-template-columns:88px minmax(0,1fr);gap:8px;align-items:stretch}.fit-chart__summary{grid-column:1 / -1}.table-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px}.table-toolbar__copy{min-inline-size:0;display:grid;gap:1px}.spec-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px}.sheet-actions{display:flex;flex-wrap:wrap;gap:8px}.check-tool__body{display:grid;gap:18px}.check-form{display:grid;gap:12px;align-items:end}.method{display:grid;gap:24px}.site-footer{inline-size:min(1180px,calc(100% - 32px));margin:40px auto 0;padding-block:22px 30px;display:flex;gap:16px;align-items:center;justify-content:space-between;border-block-start:1px solid var(--line)}.site-footer nav{display:flex;flex-wrap:wrap;gap:14px;align-items:center}@media(min-width:640px){.refine__grid{grid-template-columns:1fr 1fr}.check-form{grid-template-columns:1fr 1fr auto}.method{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}.fit-chart__main{grid-template-columns:112px minmax(0,1fr) 154px;gap:10px}.fit-chart__summary{grid-column:auto}.privacy-note{grid-column:1 / -1}}@media(min-width:1024px){.site-header,.page-shell,.site-footer{inline-size:min(1180px,calc(100% - 48px))}.site-header{block-size:52px}.intro{padding-block:12px 8px}.workspace{grid-template-columns:minmax(350px,.38fr) minmax(0,.62fr);gap:22px}.form-card{position:sticky;inset-block-start:16px;max-block-size:calc(100vh - 32px);overflow:auto;overscroll-behavior:contain}.method{margin-block-start:30px}}}@layer components{.skip-link{position:fixed;inset:8px auto auto 8px;z-index:var(--z-toast);transform:translateY(-160%);padding:9px 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3px;color:var(--ink-soft);font-size:.68rem;line-height:1.35}.intro__promise{font-size:clamp(1rem,2vw,1.08rem);max-inline-size:74ch}.intro__limit{color:var(--ink-soft);font-size:.91rem;max-inline-size:78ch}.form-card,.sheet,.check-tool,.method{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface)}.form-card{padding:18px;box-shadow:var(--shadow)}.sheet{overflow:clip}.segmented{min-inline-size:0;padding:0;border:0}.segmented legend{margin-block-end:5px;font-size:.78rem;font-weight:700}.segmented__track{display:grid;padding:3px;border-radius:var(--r-md);background:var(--surface-sunk)}.segmented--player .segmented__track{grid-template-columns:repeat(3,minmax(0,1fr))}.segmented--units .segmented__track{grid-template-columns:repeat(2,44px)}.segmented label{position:relative;display:block;min-inline-size:0;cursor:pointer}.segmented 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span{margin-block-start:2px;color:var(--ink-soft)}.form-status{min-block-size:22px;color:var(--ink-soft);font-size:.79rem}.form-status[data-kind=success]{color:var(--ok)}.form-status[data-kind=notice]{color:var(--notice)}.form-status[data-kind=error]{color:var(--danger);font-weight:650}.primary-button{min-block-size:52px;inline-size:100%;border-radius:var(--r-md);background:var(--mark);color:var(--inverse);font-size:.98rem;font-weight:760;transition:background var(--dur-fast),translate var(--dur-fast)}.primary-button:active{translate:0 1px}.presets>span{display:block;margin-block-end:6px;color:var(--ink-soft);font-size:.75rem;font-weight:700}.presets__list{display:flex;flex-wrap:wrap;gap:6px}.presets button{min-block-size:36px;padding-inline:11px;border:1px solid var(--line-control);border-radius:999px;background:var(--surface);color:var(--ink);font-size:.76rem;font-weight:560}.presets button span{font-family:var(--font-num)}.sheet__metadata{min-block-size:35px;padding:9px 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