:root {
  --ink: var(--color-text);
  --ink-soft: var(--color-text-strong);
  --canvas: var(--color-canvas);
  --paper: var(--color-paper);
  --line: var(--color-border);
  --muted: var(--color-text-muted);
  --accent: var(--color-accent);
  --accent-pale: var(--color-accent-soft);
  --danger: var(--color-danger);
  --shadow: 0 22px 50px var(--color-shadow);
  --strong-line: color-mix(in srgb, var(--color-on-strong) 18%, transparent);
  --strong-panel: color-mix(in srgb, var(--color-on-strong) 10%, transparent);
  --strong-panel-soft: color-mix(in srgb, var(--color-on-strong) 6%, transparent);
}

* { box-sizing: border-box; }
body { min-width: 320px; margin: 0; color: var(--ink); background: var(--canvas); }
button, input { font: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }
.page-shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 30px 0 36px; }
.topbar, .panel-heading, .intro, .form-title, .form-actions { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.topbar { padding-bottom: 42px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: var(--type-body); font-weight: var(--weight-heading); text-decoration: none; }
.brand-mark { display: grid; grid-template-columns: repeat(2, 7px); gap: 2px; width: 16px; height: 16px; padding: 1px; border: 1px solid var(--ink); }
.brand-mark i { background: var(--ink); }.brand-mark i:last-child { background: var(--accent); }
.back-link { color: var(--ink-soft); font-size: var(--type-control); font-weight: 700; text-decoration: none; }
.back-link:hover, .back-link:focus-visible { color: var(--ink); text-decoration: underline; }
.intro { align-items: end; padding: 0 2px 38px; gap: 48px; }
.eyebrow, .section-label { margin: 0; color: var(--ink-soft); font-size: var(--type-meta); font-weight: 700; letter-spacing: var(--tracking-label); text-transform: uppercase; }
.intro h1 { margin: 12px 0 0; font-size: var(--type-display-tool); font-weight: var(--weight-heading); line-height: var(--leading-display); letter-spacing: var(--tracking-display); }
.intro-copy { width: min(330px, 100%); margin: 0 0 3px; color: var(--muted); font-size: var(--type-body); line-height: var(--leading-body); }
.workbench { display: grid; grid-template-columns: minmax(0, .98fr) minmax(0, 1.02fr); gap: 18px; }
.parameter-panel, .result-panel { border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.parameter-panel { padding: clamp(22px, 3vw, 34px); background: var(--paper); }
.result-panel { display: flex; min-height: 610px; flex-direction: column; padding: clamp(22px, 3vw, 34px); overflow: hidden; color: var(--color-on-strong); background: var(--color-strong-surface); }
.panel-heading { align-items: start; }.panel-heading h2 { margin: 7px 0 0; font-size: var(--type-panel-title); font-weight: var(--weight-heading); line-height: var(--leading-heading); }
.fixed-unit, .result-unit { padding: 7px 9px; border-radius: 7px; color: var(--ink-soft); background: var(--color-surface); font-size: var(--type-meta); font-weight: 750; }.result-unit { color: var(--color-strong-surface); background: var(--accent); }.result-heading .section-label { color: var(--color-on-strong-muted); }
.parameter-form { margin-top: 28px; }.form-title { align-items: baseline; }.form-title h3 { margin: 0; font-size: var(--type-subheading); }.form-title span, .field-hint, .form-status { margin: 0; color: var(--muted); font-size: var(--type-meta); line-height: var(--leading-label); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 14px; margin-top: 18px; }.field label { display: block; margin-bottom: 8px; font-size: var(--type-control); font-weight: 700; }.input-wrap { position: relative; }.input-wrap input { width: 100%; height: 48px; border: 1px solid var(--line); border-radius: 9px; padding: 0 48px 0 13px; color: var(--ink); background: var(--color-control); font-size: var(--type-body); font-weight: 650; }.input-wrap input:focus { border-color: var(--ink-soft); outline: 0; box-shadow: 0 0 0 3px var(--color-focus-ring); }.input-wrap input:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--color-focus-ring); outline-offset: 2px; }.input-wrap span { position: absolute; top: 50%; right: 13px; transform: translateY(-50%); color: var(--muted); font-size: var(--type-meta); font-weight: 750; pointer-events: none; }
.field-hint { margin-top: 6px; }.form-actions { margin-top: 27px; padding-top: 19px; border-top: 1px solid var(--line); }.reset-button { min-height: 42px; border: 1px solid var(--line); border-radius: 9px; padding: 9px 15px; color: var(--ink); background: var(--color-control); font-size: var(--type-control); font-weight: 750; }.reset-button:hover { border-color: var(--ink-soft); background: var(--accent-pale); }
.empty-state, .error-state { display: grid; min-height: 400px; flex: 1; place-content: center; text-align: center; }.state-index { color: var(--accent); font-size: var(--type-meta); font-weight: 800; letter-spacing: .16em; }.empty-state h3, .error-state h3 { margin: 14px 0 10px; font-size: var(--type-card-title); font-weight: var(--weight-heading); }.empty-state p, .error-state p { max-width: 310px; margin: 0; color: var(--color-on-strong-muted); font-size: var(--type-body); line-height: var(--leading-body); }.error-state { margin-top: 28px; padding: 20px; border: 1px solid var(--danger); border-radius: 12px; color: var(--danger); background: var(--color-danger-soft); }
.result-state { display: flex; flex: 1; flex-direction: column; padding-top: 28px; }.recommendation { padding: 21px; border: 1px solid var(--strong-line); border-radius: 13px; background: var(--strong-panel-soft); }.recommendation p { margin: 0 0 9px; color: var(--color-on-strong-subtle); font-size: var(--type-control); }.recommendation div { display: flex; align-items: baseline; gap: 8px; }.recommendation output { color: var(--accent); font-size: var(--type-result); font-weight: 760; line-height: .95; letter-spacing: -.08em; }.recommendation span { font-size: var(--type-control); font-weight: 700; }.recommendation small { display: block; margin-top: 12px; color: var(--color-on-strong-muted); font-size: var(--type-meta); line-height: var(--leading-label); }
.layout-canvas { display: flex; min-height: 260px; flex-direction: column; align-content: flex-start; gap: var(--layout-gap, 4px); margin-top: 20px; overflow: hidden; border: 2px solid var(--accent); border-radius: 10px; padding: 10px; background: var(--strong-panel); }.layout-row { display: flex; min-height: 2px; gap: var(--layout-gap, 4px); overflow: hidden; }.layout-piece { display: block; min-width: 2px; flex-shrink: 1; background: var(--accent-pale); }.layout-piece--rotated { background: var(--accent); }.layout-legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 12px; color: var(--color-on-strong-subtle); font-size: var(--type-meta); }.layout-legend i { display: inline-block; width: 9px; height: 9px; margin-right: 5px; border-radius: 2px; background: var(--accent-pale); }.layout-legend .rotated-dot { background: var(--accent); }
.breakdown-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 18px; margin: 20px 0 0; }.breakdown-list > div { min-width: 0; padding: 12px 0 9px; border-top: 1px solid var(--strong-line); }.breakdown-list dt { color: var(--color-on-strong-muted); font-size: var(--type-meta); }.breakdown-list dd { margin: 6px 0 0; font-size: var(--type-control); font-weight: 700; line-height: 1.45; overflow-wrap: anywhere; }
.history-panel { margin-top: 18px; padding: clamp(22px, 3vw, 34px); border: 1px solid var(--line); border-radius: 16px; color: var(--ink); background: var(--paper); box-shadow: var(--shadow); }
.history-heading { display: flex; align-items: start; justify-content: space-between; gap: 18px; }.history-heading h2 { margin: 7px 0 0; font-size: var(--type-panel-title); font-weight: var(--weight-heading); line-height: var(--leading-heading); }.history-status { max-width: 290px; margin: 0; color: var(--muted); font-size: var(--type-meta); line-height: var(--leading-body); text-align: right; }
.history-list { display: grid; gap: 10px; margin: 22px 0 0; padding: 0; list-style: none; }.history-item, .history-empty { padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: var(--color-control); }.history-item time { color: var(--ink-soft); font-size: var(--type-meta); font-weight: 750; }.history-item p { margin: 7px 0 0; font-size: var(--type-control); line-height: var(--leading-body); }.history-item p:last-child { color: var(--muted); }.history-empty { color: var(--muted); font-size: var(--type-control); }
.page-note { margin: 27px 2px 0; color: var(--muted); font-size: var(--type-meta); line-height: var(--leading-body); }
@media (max-width: 760px) { .page-shell { width: min(100% - 28px, 620px); padding-top: 20px; }.topbar { padding-bottom: 32px; }.intro { display: block; padding-bottom: 28px; }.intro h1 { font-size: var(--type-display-tool-mobile); }.intro-copy { margin-top: 19px; }.workbench { grid-template-columns: 1fr; }.result-panel { min-height: 500px; }.layout-canvas { min-height: 210px; } }
@media (max-width: 420px) { .page-shell { width: calc(100% - 20px); }.panel-heading, .form-title, .form-actions { align-items: flex-start; }.form-title, .form-actions { flex-direction: column; }.form-grid, .breakdown-list { grid-template-columns: 1fr; }.history-heading { display: block; }.history-status { margin-top: 10px; text-align: left; }.recommendation output { font-size: clamp(48px, 18vw, 63px); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; } }