/* ============================================================
   Toolkit workspace — Linear/Raycast-like tool surface
   Inherits tokens from /assets/site.css
   ============================================================ */
.tool-topbar .topbar-inner { min-height: 60px; }
.tool-search {
  display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--surface); padding: 0 12px; height: 36px;
  transition: border-color var(--dur) var(--ease);
}
.tool-search:focus-within { border-color: var(--blue); }
.tool-search svg { width: 15px; height: 15px; color: var(--ink-3); flex: none; }
.tool-search input {
  border: 0; outline: 0; background: transparent; width: 168px;
  font-size: 13px; color: var(--ink);
}
.tool-search input::placeholder { color: var(--ink-3); }
.tool-search kbd {
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-3);
  border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px;
}

/* ---------- shell ---------- */
.tool-shell {
  display: grid; grid-template-columns: 248px minmax(0, 1fr);
  gap: clamp(24px, 4vw, 64px);
  width: min(1360px, 100% - 48px); margin: 0 auto;
  padding: 36px 0 72px;
  align-items: start;
}
.sidebar { position: sticky; top: 88px; }
.side-title {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em;
  color: var(--ink-3); padding: 22px 10px 8px; text-transform: uppercase;
}
.side-group:first-child .side-title { padding-top: 4px; }
.side-item {
  display: flex; align-items: center; gap: 11px;
  padding: 9px 11px; border-radius: 9px;
  font-size: 13.5px; color: var(--ink-2);
  border: 1px solid transparent;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.side-item:hover { background: var(--blue-soft); color: var(--blue); }
.side-item.is-active {
  background: var(--surface); color: var(--ink); font-weight: 600;
  border-color: var(--line); box-shadow: var(--shadow-sm);
}
.side-num { font-family: var(--font-mono); font-size: 10px; color: var(--ink-3); min-width: 20px; }
.side-item.is-active .side-num { color: var(--blue); }
.side-empty { font-size: 13px; color: var(--ink-3); padding: 24px 10px; }
.side-note {
  margin-top: 26px; padding: 14px; border-top: 1px solid var(--line);
  font-size: 11.5px; color: var(--ink-3); line-height: 1.7;
}

/* ---------- panel ---------- */
.main { min-width: 0; }
.panel-head { padding-bottom: 22px; border-bottom: 1px solid var(--line-strong); margin-bottom: 26px; }
.panel-eyebrow { font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em; color: var(--ink-3); text-transform: uppercase; }
.panel-head h1 {
  font-size: clamp(28px, 3.4vw, 40px); font-weight: 650; letter-spacing: -.02em;
  margin: 12px 0 10px; line-height: 1.2;
}
.panel-head p { margin: 0; color: var(--ink-2); font-size: 14.5px; max-width: 76ch; text-wrap: pretty; }
.panel-head-actions { display: flex; gap: 8px; margin-top: 18px; flex-wrap: wrap; }
.panel-body { display: block; }
.panel-foot {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--line);
  font-size: 11.5px; color: var(--ink-3);
}
.panel-foot a:hover { color: var(--blue); }

/* ---------- form primitives ---------- */
.field-grid { display: grid; gap: 16px; margin-bottom: 18px; }
.field-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.field-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.field-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.field { min-width: 0; display: flex; flex-direction: column; gap: 7px; }
.field-label { font-size: 12px; font-weight: 600; color: var(--ink-2); letter-spacing: .01em; }
.field-hint { font-size: 11.5px; color: var(--ink-3); line-height: 1.55; }
.input {
  width: 100%; min-height: 40px; padding: 9px 12px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--line); border-radius: 9px;
  font-size: 14px; transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.input:hover { border-color: var(--line-strong); }
.input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.input.mono { font-family: var(--font-mono); font-size: 13px; }
.input.short { max-width: 100%; }
.textarea { resize: vertical; line-height: 1.6; min-height: 90px; }
select.input { appearance: none; padding-right: 30px;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%), linear-gradient(135deg, var(--ink-3) 50%, transparent 50%);
  background-position: calc(100% - 17px) 18px, calc(100% - 12px) 18px;
  background-size: 5px 5px, 5px 5px; background-repeat: no-repeat;
}
.inline-row { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin: 4px 0 18px; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.check input { accent-color: var(--blue); width: 15px; height: 15px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-height: 38px; padding: 8px 15px; border-radius: 9px;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  font-size: 13px; font-weight: 600; white-space: nowrap;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--blue); border-color: var(--blue); color: var(--blue-ink); }
.btn.primary:hover { filter: brightness(1.08); color: var(--blue-ink); }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink-2); }
.btn.tiny { min-height: 30px; padding: 5px 11px; font-size: 11.5px; font-weight: 500; }
.btn.is-copied { color: var(--blue); border-color: var(--blue); }
.btn.swap-btn { width: 100%; }
.actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 6px 0 22px; }
.actions.wrap-actions { margin-top: 4px; }
.actions-hint { font-size: 11.5px; color: var(--ink-3); }

.toolbar-block { margin-bottom: 20px; }
.toolbar-label { font-size: 11px; color: var(--ink-3); margin-bottom: 9px; letter-spacing: .06em; }
.segmented { display: inline-flex; flex-wrap: wrap; gap: 3px; padding: 3px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-2); }
.seg-btn {
  border: 0; border-radius: 7px; background: transparent; color: var(--ink-2);
  padding: 7px 14px; font-size: 12.5px; transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.seg-btn:hover { color: var(--blue); }
.seg-btn.is-active { background: var(--surface); color: var(--ink); font-weight: 600; box-shadow: var(--shadow-sm); }

.examples { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; margin: 2px 0 18px; }
.examples-label { font-size: 11.5px; color: var(--ink-3); }
.example-chip {
  border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
  padding: 5px 12px; font-size: 11.5px; font-family: var(--font-mono); color: var(--ink-2);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.example-chip:hover { border-color: var(--blue); color: var(--blue); }
.quick-values { display: flex; gap: 8px; flex-wrap: wrap; margin: -4px 0 20px; }

/* ---------- formula editor ---------- */
.preview-surface {
  min-height: 132px; display: flex; align-items: center; justify-content: center;
  padding: 22px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--surface); overflow-x: auto; text-align: center;
}
.preview-surface.has-error { border-color: var(--coral); }
.preview-empty { color: var(--ink-3); font-size: 13px; }
.field-error { margin-top: 8px; font-size: 12px; color: var(--coral); }
.template-grid { display: flex; gap: 7px; flex-wrap: wrap; }
.template-btn {
  border: 1px solid var(--line); border-radius: 8px; background: var(--surface);
  padding: 7px 12px; font-size: 12px; color: var(--ink-2);
}
.template-btn:hover { border-color: var(--blue); color: var(--blue); }
.readout {
  margin-top: 14px; padding: 12px 14px; border-radius: 9px; background: var(--surface-2);
  font-size: 12.5px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.readout code { font-family: var(--font-mono); color: var(--blue); }
.cheatsheet { margin-top: 26px; border-top: 1px solid var(--line); padding-top: 16px; }
.cheatsheet summary { cursor: pointer; font-size: 13px; color: var(--ink-2); }
.cheat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; margin-top: 16px; }
.cheat-item {
  display: flex; flex-direction: column; gap: 4px; text-align: left;
  border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px; background: var(--surface);
}
.cheat-item:hover { border-color: var(--blue); }
.cheat-item span { font-size: 12px; color: var(--ink-2); }
.cheat-item code { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- results ---------- */
.js-result { margin-top: 6px; }
.js-plot { margin-top: 20px; }
.result-card {
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--surface); padding: 20px 22px; box-shadow: var(--shadow-sm);
}
.result-card.is-error { border-color: var(--coral); background: var(--coral-soft); }
.result-label {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-3); margin: 18px 0 10px;
}
.result-label:first-child { margin-top: 0; }
.result-note { font-size: 11.5px; color: var(--ink-3); line-height: 1.7; margin: 12px 0 0; }
.result-error { color: var(--coral); font-size: 13px; margin: 4px 0 0; }
.math-block { overflow-x: auto; padding: 10px 2px; font-size: 1.06em; }
.math-block .katex-display { margin: 0.4em 0; }
.kv-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 0 26px; }
.kv {
  display: flex; align-items: baseline; justify-content: space-between; gap: 14px;
  padding: 9px 0; border-bottom: 1px dashed var(--line);
}
.kv span { font-size: 12px; color: var(--ink-3); flex: none; }
.kv strong { font-weight: 600; font-size: 13px; text-align: right; min-width: 0; }
.kv code, .result-card code { font-family: var(--font-mono); font-size: 12px; color: var(--blue); word-break: break-all; }
.big-result {
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
  padding: 12px 0 18px; font-size: 16px;
}
.big-result strong { font-family: var(--font-mono); font-size: clamp(24px, 3.6vw, 38px); font-weight: 500; letter-spacing: -.03em; }
.big-result strong.accent { color: var(--blue); }
.big-result span { font-size: 13px; color: var(--ink-2); }
.big-result i { font-style: normal; color: var(--ink-3); }
.accent { color: var(--blue); }
.muted { color: var(--ink-3); font-size: 11px; }

.order-list { display: grid; gap: 4px; }
.order-row {
  display: flex; align-items: center; gap: 16px; min-height: 42px;
  padding: 6px 12px; border-radius: 8px; background: var(--surface-2); overflow-x: auto;
}
.order-row > span { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); min-width: 62px; }
.order-row em { font-size: 12px; color: var(--ink-3); }

.data-table, .matrix-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.data-table th, .matrix-table th {
  text-align: left; font-weight: 600; color: var(--ink-3); font-size: 11px;
  padding: 8px 10px; border-bottom: 1px solid var(--line-strong);
}
.data-table td, .matrix-table td { padding: 8px 10px; border-bottom: 1px solid var(--line); }
.data-table tbody tr:hover { background: var(--blue-soft); }
.data-table code { font-family: var(--font-mono); font-size: 12px; color: var(--blue); }
.matrix-table { max-width: 420px; }
.matrix-table td { font-family: var(--font-mono); text-align: center; }

.callout {
  border: 1px solid var(--line); border-left: 2px solid var(--blue);
  border-radius: 8px; padding: 10px 14px; margin-bottom: 18px;
  font-size: 12px; color: var(--ink-2); background: var(--surface);
}
.callout.is-error { border-left-color: var(--coral); color: var(--coral); }
.rate-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 14px 0; }
.rate-item { display: flex; flex-direction: column; gap: 5px; font-size: 11px; color: var(--ink-3); }
.rate-item .input { min-height: 34px; padding: 6px 10px; font-size: 12px; }
.collapsible { margin-top: 26px; border-top: 1px solid var(--line); padding-top: 14px; }
.collapsible summary { cursor: pointer; font-size: 13px; color: var(--ink-2); }
.sub-tool {
  border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px;
  margin-bottom: 18px; background: var(--surface);
}
.sub-tool-head { font-size: 13px; font-weight: 600; margin-bottom: 16px; }
.inline-result {
  margin-top: 14px; padding: 12px 14px; border-radius: 8px;
  background: var(--surface-2); font-size: 13px; line-height: 1.8;
}
.inline-result code { font-family: var(--font-mono); font-size: 12px; color: var(--blue); }

/* ---------- plots ---------- */
.plot {
  width: 100%; height: auto; display: block;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
}
.plot-grid { stroke: var(--line); stroke-width: 1; }
.plot-axis { stroke: var(--line-strong); stroke-width: 1.4; }
.plot-label, .plot-axis-label { fill: var(--ink-3); font-family: var(--font-mono); font-size: 10px; }
.plot-axis-label { font-size: 11px; }
.plot-curve { fill: none; stroke: var(--blue); stroke-width: 2.2; stroke-linejoin: round; stroke-linecap: round; }
.plot-curve-alt { fill: none; stroke: var(--coral); stroke-width: 2; stroke-dasharray: 7 4; stroke-linejoin: round; }
.plot-curve-third { fill: none; stroke: var(--ink-2); stroke-width: 1.8; stroke-dasharray: 2 3; stroke-linejoin: round; }
.plot-fill { fill: var(--blue); opacity: .13; stroke: none; }
.plot-guide { stroke: var(--ink-3); stroke-width: 1; }
.plot-guide-dash { stroke: var(--ink-3); stroke-width: 1.3; stroke-dasharray: 6 5; }
.plot-ground { stroke: var(--ink-2); stroke-width: 1.6; }
.plot-point { fill: var(--coral); stroke: var(--surface); stroke-width: 1.5; }
.plot-point-alt { fill: var(--blue); stroke: var(--surface); stroke-width: 1.5; }
.plot-point-label, .plot-guide-label { fill: var(--ink-2); font-family: var(--font-mono); font-size: 11px; }
.plot-guide-label { fill: var(--ink-3); }
.plot-legend { font-size: 11.5px; color: var(--ink-3); margin: 10px 0 0; }
.legend-line { display: inline-block; width: 16px; height: 2px; background: var(--blue); vertical-align: middle; margin-right: 4px; }
.legend-line.alt { background: var(--coral); }
.legend-line.third { background: var(--ink-2); }
.legend-fill { display: inline-block; width: 16px; height: 10px; background: var(--blue); opacity: .18; vertical-align: middle; margin-right: 4px; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .tool-shell { grid-template-columns: 1fr; gap: 24px; padding-top: 24px; }
  .sidebar { position: static; }
  .side-group { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
  .side-title { width: 100%; padding: 12px 0 2px; }
  .side-item { border: 1px solid var(--line); background: var(--surface); padding: 7px 11px; }
  .side-item.is-active { border-color: var(--blue); }
  .side-note { display: none; }
  .field-grid.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .tool-shell { width: min(1360px, 100% - 32px); }
  .field-grid.two, .field-grid.three, .field-grid.four { grid-template-columns: 1fr; }
  .tool-search input { width: 110px; }
  .tool-search kbd { display: none; }
  .result-card { padding: 16px; }
  .panel-head h1 { font-size: 27px; }
  .kv-list { grid-template-columns: 1fr; }
  .wordmark span, .tb-link { display: none; }
}

/* ---------- color wheel & swatches ---------- */
.color-workspace {
  display: grid; grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: 18px; align-items: start;
}
.color-workspace .sub-tool { margin-bottom: 18px; }
.wheel-frame { display: flex; justify-content: center; padding: 4px 0 12px; }
.wheel {
  position: relative; width: min(300px, 100%); aspect-ratio: 1 / 1; border-radius: 50%;
  cursor: crosshair; border: 1px solid var(--line-strong); outline-offset: 4px;
  touch-action: none; box-shadow: var(--shadow-sm);
  background:
    radial-gradient(circle at 50% 50%, #fff 0%, rgba(255, 255, 255, 0) 100%),
    conic-gradient(#f00 0deg, #ff0 60deg, #0f0 120deg, #0ff 180deg, #00f 240deg, #f0f 300deg, #f00 360deg);
}
.wheel-dim, .wheel-svg { position: absolute; inset: 0; width: 100%; height: 100%; border-radius: 50%; pointer-events: none; }
.wheel-svg { overflow: visible; }
.wheel-ring { fill: none; stroke: rgba(255, 255, 255, .55); stroke-width: 1; }
.wheel-edge { fill: none; stroke: rgba(0, 0, 0, .6); stroke-width: 5.5; stroke-linejoin: round; stroke-linecap: round; }
.wheel-line { fill: none; stroke: #fff; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.wheel-dot { stroke: #fff; stroke-width: 2.4; }
.wheel-marker { fill: none; stroke: #0066cc; stroke-width: 3; }
.wheel-frame + .field-hint { margin: 0 0 18px; }
.color-native {
  width: 100%; height: 40px; padding: 3px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 9px; background: var(--surface);
}
.color-range { width: 100%; min-height: 40px; accent-color: var(--blue); }
.swatch-head {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  margin: 4px 0 14px; font-family: var(--font-mono); font-size: 10px;
  letter-spacing: .12em; color: var(--ink-3); text-transform: uppercase;
}
.swatch-head span:last-child { letter-spacing: 0; text-transform: none; }
.swatch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(238px, 1fr)); gap: 14px; }
.swatch { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--surface); }
.swatch-chip {
  height: 88px; display: flex; justify-content: space-between; align-items: flex-start;
  gap: 8px; padding: 10px 12px;
}
.swatch-chip span {
  font-family: var(--font-mono); font-size: 10.5px;
  padding: 3px 7px; border-radius: 5px; background: rgba(255, 255, 255, .86); color: #16181d;
}
.swatch-chip .swatch-angle { background: rgba(0, 0, 0, .62); color: #fff; }
.swatch-body { padding: 12px 14px 14px; }
.swatch-title { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.swatch-title code { font-family: var(--font-mono); font-size: 14px; font-weight: 600; color: var(--ink); }
.color-rows { display: grid; gap: 1px; }
.color-row { display: grid; grid-template-columns: 40px minmax(0, 1fr) 26px; gap: 6px; align-items: center; min-height: 28px; }
.color-row > span { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-3); }
.color-row code {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-2);
  word-break: break-all; line-height: 1.35;
}
.copy-mini {
  border: 0; background: transparent; color: var(--ink-3); font-size: 14px;
  line-height: 1; padding: 3px; border-radius: 5px; cursor: pointer;
}
.copy-mini:hover { color: var(--blue); background: var(--blue-soft); }
.copy-mini.is-copied { color: var(--blue); }
@media (max-width: 1180px) {
  .color-workspace { grid-template-columns: 1fr; }
  .wheel-frame { justify-content: flex-start; }
}
@media (max-width: 640px) {
  .swatch-grid { grid-template-columns: 1fr; }
  .wheel { width: min(280px, 100%); }
}