/* Seller Profit Calculator — design tokens and components.
   Palette roles: graphite ink on warm paper, one amber signal colour.
   Dark theme keeps the same roles so both modes read as one product. */

/* ---------- 1. Tokens ---------- */
:root {
  color-scheme: light;

  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --ink: #1c1a17;
  --ink-soft: #3a352e;
  --muted: #6b655c;
  --line: #e7e3da;
  --line-strong: #d7d2c6;
  --hairline: #efebe3;

  --accent: #b45309;
  --accent-strong: #8f3f07;

  --soft: #f1efea;
  --red: #9f2c2c;
  --error-bg: #fdf2f0;
  --error-line: #e9c6c0;

  --control-bg: #ffffff;
  --control-line: #d9d4c9;
  --control-line-hover: #b7b0a2;

  --button-bg: #1c1a17;
  --button-ink: #ffffff;
  --button-hover: #38322a;

  --result-bg: #fbf6ec;
  --result-line: #ebe2cd;

  --focus: #b45309;
  --ring: rgba(180, 83, 9, .15);

  --shadow-sm: 0 1px 2px rgba(28, 26, 23, .05), 0 1px 3px rgba(28, 26, 23, .04);
  --shadow-md: 0 2px 4px rgba(28, 26, 23, .04), 0 12px 26px -8px rgba(28, 26, 23, .1);
  --shadow-lg: 0 4px 10px rgba(28, 26, 23, .05), 0 28px 52px -14px rgba(28, 26, 23, .14);

  --r-sm: 8px;
  --r: 12px;
  --r-lg: 16px;
  --r-pill: 999px;

  --brand-bg: transparent;
  --brand-padding: 0;

  --ease: cubic-bezier(.2, .7, .3, 1);
  --speed: 160ms;

  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #121110;
  --surface: #1a1917;
  --surface-raised: #26221b;
  --ink: #f4f1eb;
  --ink-soft: #d8d3c9;
  --muted: #9c958a;
  --line: #302d28;
  --line-strong: #3a3733;
  --hairline: #2f2b25;

  --accent: #f0b429;
  --accent-strong: #f3c34e;

  --soft: #221f1b;
  --red: #ff9d94;
  --error-bg: #2b1a18;
  --error-line: #6b3a33;

  --control-bg: #1a1917;
  --control-line: #403c35;
  --control-line-hover: #5c574d;

  --button-bg: #f2ede2;
  --button-ink: #17150f;
  --button-hover: #ffffff;

  --result-bg: #201b12;
  --result-line: #453822;

  --focus: #f0b429;
  --ring: rgba(240, 180, 41, .18);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .34);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, .38), 0 14px 30px -10px rgba(0, 0, 0, .5);
  --shadow-lg: 0 6px 16px rgba(0, 0, 0, .42), 0 30px 60px -16px rgba(0, 0, 0, .6);

  --brand-bg: #f2ede2;
  --brand-padding: 4px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #121110;
    --surface: #1a1917;
    --surface-raised: #26221b;
    --ink: #f4f1eb;
    --ink-soft: #d8d3c9;
    --muted: #9c958a;
    --line: #302d28;
    --line-strong: #3a3733;
    --hairline: #2f2b25;
    --accent: #f0b429;
    --accent-strong: #f3c34e;
    --soft: #221f1b;
    --red: #ff9d94;
    --error-bg: #2b1a18;
    --error-line: #6b3a33;
    --control-bg: #1a1917;
    --control-line: #403c35;
    --control-line-hover: #5c574d;
    --button-bg: #f2ede2;
    --button-ink: #17150f;
    --button-hover: #ffffff;
    --result-bg: #201b12;
    --result-line: #453822;
    --focus: #f0b429;
    --ring: rgba(240, 180, 41, .18);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .34);
    --shadow-md: 0 2px 6px rgba(0, 0, 0, .38), 0 14px 30px -10px rgba(0, 0, 0, .5);
    --shadow-lg: 0 6px 16px rgba(0, 0, 0, .42), 0 30px 60px -16px rgba(0, 0, 0, .6);
    --brand-bg: #f2ede2;
    --brand-padding: 4px;
  }
}

/* ---------- 2. Base ---------- */
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.03em; color: var(--ink); }
h1 { max-width: 900px; margin-bottom: 18px; font-size: clamp(2.2rem, 4vw, 3.3rem); }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.05rem; }
p { margin-bottom: 18px; }
a { color: var(--accent-strong); text-decoration-color: var(--ring); text-underline-offset: 4px; transition: color var(--speed) var(--ease), text-decoration-color var(--speed) var(--ease); }
a:hover { color: var(--ink); text-decoration-color: currentColor; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; border: 0; }
button:disabled { opacity: .55; cursor: wait; }
button, a, input, select, summary { touch-action: manipulation; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
[hidden] { display: none !important; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
}

.skip-link { position: absolute; top: -100px; left: 15px; z-index: 10; padding: 12px 16px; border-radius: var(--r-sm); background: var(--button-bg); color: var(--button-ink); }
.skip-link:focus { top: 10px; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 28px 70px; }

.eyebrow { margin: 0 0 16px; color: var(--accent-strong); font-size: .71rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; }

/* ---------- 3. Header ---------- */
.site-header {
  display: flex; align-items: center; gap: 28px;
  max-width: 1160px; margin: 0 auto; padding: 22px 28px;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; flex-shrink: 0; align-items: center; gap: 12px; min-height: 44px; color: var(--ink); text-decoration: none; }
.brand-mark { display: block; flex: none; width: 36px; height: 42px; padding: var(--brand-padding); border-radius: 9px; background: var(--brand-bg); transition: transform var(--speed) var(--ease); }
.brand:hover .brand-mark { transform: translateY(-1px) rotate(-2deg); }
.brand-wordmark { font-size: 1.18rem; font-weight: 600; letter-spacing: -.045em; line-height: 1.1; }
.brand-detail { display: block; margin-top: 6px; color: var(--muted); font-size: .55rem; font-weight: 600; letter-spacing: .26em; line-height: 1.4; }
.site-header nav { display: flex; gap: 2px; margin-left: auto; }
.site-header nav a { position: relative; padding: 10px 12px; border-radius: var(--r-sm); color: var(--muted); font-size: .88rem; font-weight: 500; text-decoration: none; transition: color var(--speed) var(--ease), background-color var(--speed) var(--ease); }
.site-header nav a:hover { color: var(--ink); background: var(--soft); }
.site-header nav a[aria-current] { color: var(--ink); font-weight: 600; }
.site-header nav a[aria-current]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 2px; border-radius: 2px; background: var(--accent); }

/* Segmented light / system / dark switch. Real radios keep arrow-key support. */
.theme-switch {
  display: flex; flex: none; align-items: center; gap: 2px;
  margin: 0; padding: 4px; min-width: 0;
  border: 1px solid var(--line); border-radius: var(--r-pill);
  background: var(--surface); box-shadow: var(--shadow-sm);
}
.theme-switch input { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.theme-switch label {
  display: grid; place-items: center; width: 34px; height: 34px;
  border-radius: var(--r-pill); color: var(--muted); cursor: pointer;
  transition: color var(--speed) var(--ease), background-color var(--speed) var(--ease);
}
.theme-switch label svg { display: block; width: 17px; height: 17px; }
.theme-switch label:hover { color: var(--ink); background: var(--soft); }
.theme-switch input:checked + label { color: var(--button-ink); background: var(--button-bg); }
.theme-switch input:focus-visible + label { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ---------- 5. Calculator ---------- */
.page-heading { max-width: 800px; padding-top: 48px; }
.page-heading > p:last-child { margin-bottom: 26px; color: var(--muted); font-size: 1.05rem; }
.calculator-layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 24px; align-items: start; }

.panel { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); box-shadow: var(--shadow-sm); }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 22px; }
.panel-heading h2 { margin: 0; font-size: 1.2rem; }

.text-button {
  display: inline-flex; align-items: center; min-height: 44px; padding: 8px 2px;
  background: transparent; color: var(--accent-strong);
  font-size: .79rem; font-weight: 600;
  text-decoration: underline; text-decoration-color: var(--ring); text-underline-offset: 4px;
  transition: color var(--speed) var(--ease), text-decoration-color var(--speed) var(--ease);
}
.text-button:hover { color: var(--ink); text-decoration-color: currentColor; }

.field { min-width: 0; margin-bottom: 20px; }
.field label { display: block; margin-bottom: 8px; color: var(--ink); font-size: .81rem; font-weight: 600; }
.field small { display: block; margin-top: 8px; color: var(--muted); font-size: .74rem; line-height: 1.5; }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field-grid .field { margin: 0; }

.input-wrap {
  display: flex; align-items: stretch;
  border: 1px solid var(--control-line); border-radius: 10px; background: var(--control-bg);
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}
.input-wrap:hover { border-color: var(--control-line-hover); }
.input-wrap:focus-within { border-color: var(--focus); box-shadow: 0 0 0 4px var(--ring); }
.input-wrap > span { display: flex; align-items: center; padding: 0 14px; border-right: 1px solid var(--line); color: var(--muted); font-size: .88rem; font-weight: 500; font-variant-numeric: tabular-nums; }
.input-wrap > span + input { padding-left: 14px; }
.input-wrap input { width: 100%; min-width: 0; padding: 13px 14px; border: 0; background: none; color: var(--ink); font-size: 1rem; line-height: 1.35; font-variant-numeric: tabular-nums; }
.input-wrap input:focus { outline: none; }

/* Native select keeps its listbox behaviour; the arrow is drawn by us so it
   sits clear of the border instead of touching it. */
.select-wrap { position: relative; display: block; }
.select-wrap select {
  display: block; width: 100%; min-width: 0;
  padding: 13px 44px 13px 15px;
  border: 1px solid var(--control-line); border-radius: 10px;
  background: var(--control-bg); color: var(--ink);
  font-size: .95rem; line-height: 1.35; cursor: pointer;
  appearance: none; -webkit-appearance: none;
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}
.select-wrap select:hover { border-color: var(--control-line-hover); }
.select-wrap select:focus-visible { outline: none; border-color: var(--focus); box-shadow: 0 0 0 4px var(--ring); }
.select-chevron { position: absolute; top: 50%; right: 15px; width: 15px; height: 15px; transform: translateY(-50%); color: var(--muted); pointer-events: none; }

.form-section { margin: 30px 0 14px; color: var(--muted); font-size: .74rem; font-weight: 600; letter-spacing: .13em; text-transform: uppercase; }

.advanced { margin: 26px 0 22px; padding-top: 6px; border-top: 1px solid var(--line); }
.advanced .field-grid { margin-top: 12px; }

.advanced summary, .result-details summary {
  display: flex; align-items: center; gap: 11px;
  min-height: 44px; cursor: pointer; list-style: none;
  color: var(--ink); font-size: .86rem; font-weight: 600;
  transition: color var(--speed) var(--ease);
}
.advanced summary::-webkit-details-marker, .result-details summary::-webkit-details-marker { display: none; }
.advanced summary::before, .result-details summary::before {
  content: ""; width: 6px; height: 6px; margin-right: 1px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform var(--speed) var(--ease);
}
.advanced[open] summary::before, .result-details[open] summary::before { transform: rotate(45deg); }
.advanced summary:hover, .result-details summary:hover { color: var(--accent-strong); }

.presets { display: flex; align-items: center; gap: 6px; }
.presets button {
  min-height: 44px; padding: 9px 14px;
  border: 1px solid transparent; border-radius: 9px;
  background: var(--soft); color: var(--muted);
  font-size: .8rem; font-weight: 600;
  transition: color var(--speed) var(--ease), background-color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}
.presets button:hover { border-color: var(--control-line-hover); color: var(--ink); }
.presets button.is-active { border-color: var(--button-bg); background: var(--button-bg); color: var(--button-ink); }

.validation { margin: 0 0 16px; padding: 13px 15px; border: 1px solid var(--error-line); border-radius: var(--r); background: var(--error-bg); color: var(--red); font-size: .86rem; }

.primary-button {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 15px 22px;
  border-radius: 10px; background: var(--button-bg); color: var(--button-ink);
  font-size: .98rem; font-weight: 600; text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease), transform var(--speed) var(--ease);
}
.primary-button:hover { background: var(--button-hover); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.primary-button:active { box-shadow: var(--shadow-sm); transform: translateY(0); }
.primary-button span { transition: transform var(--speed) var(--ease); }
.primary-button:hover span { transform: translateX(3px); }
.input-panel .primary-button { width: 100%; margin-top: 6px; }

.save-row { display: flex; flex-wrap: wrap; gap: 4px 20px; margin-top: 10px; }
.small-status { min-height: 1px; margin: 6px 0 0; color: var(--muted); font-size: .76rem; line-height: 1.5; }

/* ---------- 6. Result ---------- */
.result-panel { border-color: var(--result-line); background: var(--result-bg); box-shadow: var(--shadow-md); scroll-margin-top: 20px; }
.amount { margin: 0 0 6px; font-size: clamp(2.5rem, 4.6vw, 3.5rem); font-weight: 600; letter-spacing: -.045em; line-height: 1.04; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.amount.amount-long { font-size: clamp(1.75rem, 3vw, 2.4rem); letter-spacing: -.03em; }
.negative { color: var(--red); }
.result-subtitle { margin-bottom: 22px; color: var(--muted); font-size: .85rem; }
.result-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; margin-bottom: 20px; padding: 18px 0; border-top: 1px solid var(--result-line); border-bottom: 1px solid var(--result-line); }
.result-stats span { display: block; color: var(--muted); font-size: .74rem; }
.result-stats strong { font-size: 1.1rem; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.insight { margin-bottom: 20px; color: var(--accent-strong); font-size: .81rem; line-height: 1.55; }

.breakdown { margin: 0; font-size: .78rem; font-variant-numeric: tabular-nums; }
.breakdown > div { display: flex; justify-content: space-between; gap: 18px; padding: 9px 0; border-bottom: 1px solid var(--hairline); }
.breakdown > div:last-child { border-bottom: 0; }
.breakdown dt { color: var(--muted); }
.breakdown dd { margin: 0; text-align: right; white-space: nowrap; }
.breakdown .subtotal { margin-top: 2px; padding-top: 11px; border-top: 1px solid var(--result-line); border-bottom: 0; font-weight: 600; }
.breakdown .subtotal dt { color: var(--ink); }

.result-note { margin: 18px 0 10px; padding-top: 17px; border-top: 1px solid var(--result-line); color: var(--muted); font-size: .7rem; line-height: 1.5; }
.result-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.result-actions button { min-height: 44px; padding: 10px 16px; border: 1px solid var(--control-line); border-radius: 9px; background: var(--surface-raised); color: var(--ink); font-size: .82rem; font-weight: 600; transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease); }
.result-actions button:hover { border-color: var(--accent); color: var(--accent-strong); box-shadow: var(--shadow-sm); }
.result-details { margin-top: 20px; font-size: .8rem; }

.table-scroll { overflow-x: auto; }
.comparison-scroll { max-width: 100%; }
.comparison-scroll:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.comparison { width: 100%; border-collapse: collapse; font-size: .79rem; font-variant-numeric: tabular-nums; }
.comparison caption { margin: 0 0 8px; color: var(--muted); font-size: .75rem; text-align: left; }
.comparison th, .comparison td { padding: 11px 4px; border-bottom: 1px solid var(--result-line); text-align: right; white-space: nowrap; }
.comparison thead th { color: var(--muted); font-size: .68rem; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; }
.comparison th:first-child { text-align: left; font-weight: 500; }
.comparison tbody tr:last-child th, .comparison tbody tr:last-child td { border-bottom: 0; }
.comparison tbody tr:nth-child(4) { font-weight: 600; }
.comparison tbody tr:nth-child(4) th { font-weight: 600; }

/* ---------- 7. Editorial pages and footer ---------- */
.prose { max-width: 790px; color: var(--ink-soft); font-size: .97rem; }
.prose h1, .prose h2, .prose h3 { color: var(--ink); }
.prose h2 { margin: 38px 0 14px; font-size: 1.55rem; }
.prose p { margin-bottom: 16px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin-bottom: 9px; }
.editorial { min-height: 400px; padding-top: 55px; }
.editorial > h1 { font-size: 2.7rem; }
.rates { width: 100%; min-width: 560px; border-collapse: collapse; font-size: .8rem; }
.rates th, .rates td { padding: 14px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.rates th { color: var(--ink); font-weight: 600; }
.rates small { display: block; margin-top: 6px; color: var(--muted); font-size: .72rem; font-weight: 400; line-height: 1.45; }

.site-footer { display: flex; justify-content: space-between; gap: 30px; max-width: 1104px; margin: auto; padding: 32px 0 40px; border-top: 1px solid var(--line); font-size: .79rem; }
.site-footer p { margin: 8px 0 0; color: var(--muted); font-size: .73rem; }
.site-footer nav { display: flex; flex-wrap: wrap; align-items: start; gap: 22px; }
.site-footer a { padding: 6px 0; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; text-underline-offset: 3px; }

#copy-status textarea { width: 100%; min-height: 180px; padding: 10px; border: 1px solid var(--control-line); border-radius: var(--r-sm); background: var(--control-bg); color: var(--ink); font-size: .75rem; }

/* ---------- 8. Optional analytics controls (markup exists only when the build enables analytics) ---------- */
.site-footer nav button { padding: 6px 0; border: 0; background: none; color: var(--accent-strong); font-size: inherit; font-weight: 400; cursor: pointer; }
.site-footer nav button:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }

.analytics-banner {
  position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); z-index: 20;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 18px;
  max-width: min(92vw, 620px); padding: 16px 18px;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--surface); box-shadow: var(--shadow-lg);
}
.analytics-banner-text { margin: 0; color: var(--ink-soft); font-size: .82rem; line-height: 1.5; max-width: 34ch; text-align: left; }
.analytics-banner-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.analytics-primary { min-height: 44px; padding: 10px 18px; border-radius: 9px; background: var(--button-bg); color: var(--button-ink); font-size: .82rem; font-weight: 600; transition: background-color var(--speed) var(--ease); }
.analytics-primary:hover { background: var(--button-hover); }
.analytics-quiet { min-height: 44px; padding: 10px 18px; border: 1px solid var(--control-line); border-radius: 9px; background: var(--surface); color: var(--ink); font-size: .82rem; font-weight: 600; transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease); }
.analytics-quiet:hover { border-color: var(--accent); color: var(--accent-strong); }

.analytics-dialog { max-width: min(92vw, 460px); padding: 26px 28px; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); color: var(--ink); box-shadow: var(--shadow-lg); }
.analytics-dialog::backdrop { background: rgba(15, 14, 12, .45); }
.analytics-dialog h2 { margin-bottom: 10px; font-size: 1.15rem; }
.analytics-dialog p { margin-bottom: 14px; color: var(--ink-soft); font-size: .88rem; line-height: 1.55; }
.analytics-status { color: var(--muted) !important; font-size: .78rem !important; }
.analytics-dialog-actions { display: flex; flex-wrap: wrap; gap: 8px; }

@media (max-width: 520px) {
  .analytics-banner { flex-direction: column; align-items: stretch; bottom: 12px; }
  .analytics-banner-text { max-width: none; }
  .analytics-dialog-actions { flex-direction: column; align-items: stretch; }
}

/* ---------- 10. Responsive ---------- */
@media (max-width: 1000px) {
  .scope a { margin-left: 0; }
  .site-footer { margin: 0 28px; }
  .tool-card { padding: 22px; }
  .tool-card h2 { font-size: 1.25rem; }
  .panel { padding: 22px; }
  .site-header { gap: 18px; }
  .site-header nav { gap: 2px; }
}

@media (max-width: 760px) {
  .container { padding: 0 20px 45px; }
  .site-header { flex-wrap: wrap; align-items: start; gap: 14px; padding: 18px 20px; }
  .site-header nav { order: 3; gap: 2px; width: 100%; margin-left: 0; padding-top: 4px; }
  .site-header nav a { padding: 10px 10px; font-size: .82rem; }
  .theme-switch { margin-left: auto; }
  .home-hero { padding: 48px 0 35px; }
  .hero-description { font-size: 1rem; }
  .tool-cards { grid-template-columns: 1fr; }
  .tool-card { padding: 24px; }
  .card-number { margin-bottom: 16px; }
  .card-arrow { padding-top: 6px; }
  .home-method { grid-template-columns: 1fr; gap: 15px; padding-top: 30px; }
  .home-method h2 { font-size: 2.2rem; }
  .home-tools { padding-bottom: 35px; }
  .page-heading { padding-top: 32px; }
  .page-heading h1 { font-size: 2.25rem; }
  .calculator-layout { grid-template-columns: 1fr; gap: 20px; }
  .scope { display: block; margin-bottom: 25px; }
  .scope strong, .scope span, .scope a { display: block; margin-bottom: 5px; }
  .scope a { margin-bottom: 0; }
  .panel { padding: 24px; }
  .amount { font-size: 3.2rem; }
  .site-footer { flex-direction: column; gap: 18px; margin: 0 20px; padding-top: 25px; }
  .site-footer nav { gap: 18px; }
  .editorial { padding-top: 35px; }
  .editorial > h1 { font-size: 2.1rem; }
  .presets { flex-wrap: wrap; gap: 6px; }
  .presets button { min-width: 44px; padding: 8px; }
}

@media (max-width: 390px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .site-header { padding: 16px; }
  .theme-switch { padding: 3px; }
  .theme-switch label { width: 31px; height: 31px; }
  .panel { padding: 19px; }
  .field-grid { gap: 15px; }
  .field label { font-size: .76rem; }
  .select-wrap select { font-size: .88rem; }
  .input-wrap > span { padding: 0 10px; }
  .input-wrap input { padding: 12px 11px; font-size: .96rem; }
  .comparison { font-size: .73rem; }
  .amount { font-size: 2.8rem; }
  .result-actions { gap: 8px; }
  .site-header nav { gap: 0; }
}

/* ---------- 11. Tool workspace and help hierarchy ---------- */
.site-header { padding-top: 18px; padding-bottom: 18px; }
.page-heading { max-width: none; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 36px; padding-bottom: 26px; }
.page-heading .eyebrow { margin-bottom: 10px; }
.page-heading h1 { max-width: 780px; margin-bottom: 12px; font-size: clamp(1.9rem, 3.1vw, 2.65rem); letter-spacing: -.045em; }
.page-heading > div > p:last-child { margin: 0; color: var(--muted); font-size: 1rem; }
.source-stamp { display: flex; flex: none; align-items: center; gap: 10px; color: var(--ink-soft); text-decoration: none; font-size: .77rem; line-height: 1.5; }
.source-stamp svg { width: 26px; height: 26px; color: var(--accent); }
.source-stamp small { display: block; color: var(--muted); font-size: .72rem; }
.source-stamp:hover span { text-decoration: underline; }
.workspace-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 16px; }
.tool-navigation { display: flex; flex-wrap: wrap; gap: 4px; padding: 5px; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); }
.tool-navigation a { display: flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 8px 17px; border-radius: 8px; color: var(--muted); font-size: .82rem; font-weight: 600; text-decoration: none; }
.tool-navigation a svg { width: 18px; height: 18px; flex: none; }
.tool-navigation a:hover { background: var(--surface); color: var(--ink); }
.tool-navigation a[aria-current] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow-sm); }
.section-navigation { display: flex; gap: 18px; font-size: .77rem; }
.section-navigation a { min-height: 44px; display: inline-flex; align-items: center; color: var(--muted); text-decoration: none; }
.section-navigation a:hover { color: var(--accent-strong); }
.calculator-workspace, #how-it-works, #faq { scroll-margin-top: 24px; }
.workspace-caption { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 16px; margin-bottom: 14px; color: var(--muted); font-size: .72rem; }
.workspace-caption p { margin: 0; }
.workspace-caption > p:first-child { color: var(--ink-soft); font-weight: 500; }
.mobile-result-link { display: none; }
.calculator-layout { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 24px; }
.panel { padding: 24px; }
.panel-heading { margin-bottom: 20px; }
.panel-heading h2 { font-size: 1.15rem; }
.input-section { min-width: 0; margin: 0 0 23px; padding: 0; border: 0; }
.input-section legend { display: flex; align-items: center; gap: 8px; width: 100%; margin-bottom: 14px; padding: 0; color: var(--ink-soft); font-size: .8rem; font-weight: 600; }
.step-number { display: inline-grid; place-items: center; width: 24px; height: 24px; flex: none; border: 1px solid var(--line); border-radius: 7px; background: var(--soft); color: var(--muted); font-size: .63rem; font-weight: 500; }
.input-section + .input-section { padding-top: 18px; border-top: 1px solid var(--line); }
.field label { font-size: .8rem; }
.input-wrap input { padding-top: 11px; padding-bottom: 11px; }
.select-wrap select { padding-top: 12px; padding-bottom: 12px; font-size: .88rem; }
.field-note { margin: 9px 0 0; color: var(--muted); font-size: .73rem; line-height: 1.5; }
.field-note:empty { display: none; }
.tax-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 16px; margin-top: 16px; }
.tax-row .field { margin: 0; }
.tax-row > p { margin: 0; color: var(--muted); font-size: .74rem; line-height: 1.55; }
.tax-row .field small { font-size: .71rem; }
.advanced { margin: 16px 0 0; padding-top: 6px; }
.advanced summary { flex-wrap: wrap; font-size: .8rem; gap: 8px; }
.advanced summary > span { margin-left: auto; color: var(--muted); font-size: .7rem; font-weight: 400; }
.presets { margin-top: 8px; }
.presets button { min-height: 36px; padding: 6px 10px; }
.input-panel .primary-button { margin-top: 0; min-height: 50px; }
.calculate-actions { margin-top: 4px; }
.save-row { margin-top: 8px; }
.save-row .text-button { font-size: .72rem; }
[aria-invalid="true"] { outline: 2px solid var(--red); outline-offset: -2px; border-radius: 8px; background: var(--error-bg); }
.input-wrap:has(input[aria-invalid="true"]) { border-color: var(--red); }
.input-wrap input[aria-invalid="true"] { background: var(--error-bg); }
.field .validation { margin: 9px 0 0; font-size: .76rem; line-height: 1.5; }
.result-panel { position: sticky; top: 24px; border-color: var(--line-strong); background: var(--surface); box-shadow: var(--shadow-md); scroll-margin-top: 20px; }
.result-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.result-heading .eyebrow { margin: 0; color: var(--muted); letter-spacing: .12em; }
.result-badge { padding: 4px 9px; border-radius: 6px; background: var(--soft); color: var(--muted); font-size: .66rem; font-weight: 600; }
.result-status { margin: 10px 0 16px; color: var(--muted); font-size: .73rem; line-height: 1.5; }
.result-hero { padding: 24px; border-radius: 12px; background: #1c1a17; color: #fff; }
.result-hero > p:first-child { margin: 0 0 10px; color: #ded8ce; font-size: .8rem; font-weight: 500; }
.result-hero .amount { margin-bottom: 9px; color: #ffd080; font-size: clamp(2.75rem, 4.2vw, 3.6rem); letter-spacing: -.045em; font-weight: 600; }
.result-hero .amount.amount-long { font-size: clamp(1.75rem, 2.9vw, 2.5rem); }
.result-hero .amount.negative { color: #ffaaa4; }
.result-hero .result-subtitle { margin: 0; color: #c7bfb3; font-size: .77rem; }
#result { transition: opacity var(--speed) var(--ease); }
.result-panel[data-state="dirty"] #result, .result-panel[data-state="invalid"] #result, .result-panel[data-state="unavailable"] #result { opacity: .48; }
.result-panel[data-state="dirty"] .result-status { padding: 10px 12px; border: 1px solid var(--result-line); border-radius: 8px; background: var(--result-bg); color: var(--accent-strong); font-weight: 600; }
.result-panel[data-state="dirty"] .result-badge { background: var(--result-bg); color: var(--accent-strong); }
.result-panel[data-state="invalid"] .result-status, .result-panel[data-state="unavailable"] .result-status { padding: 10px 12px; border: 1px solid var(--error-line); border-radius: 8px; background: var(--error-bg); color: var(--red); font-weight: 600; }
.result-panel[data-state="invalid"] .result-badge, .result-panel[data-state="unavailable"] .result-badge { background: var(--error-bg); color: var(--red); }
.result-stats { margin: 16px 0 20px; padding: 0; gap: 12px; border: 0; }
.result-stats > div { padding: 12px 15px; border-radius: 9px; background: var(--soft); }
.result-stats span { margin-bottom: 2px; font-size: .72rem; }
.result-stats strong { font-size: 1.25rem; font-weight: 600; }
.revenue-split { margin-bottom: 18px; }
.revenue-split > p { margin-bottom: 9px; color: var(--ink-soft); font-size: .73rem; }
.revenue-split svg { display: block; width: 100%; height: 8px; overflow: hidden; border-radius: 4px; background: var(--soft); }
.split-fees { fill: #7f7668; }
.split-costs { fill: #d4c7b2; }
.split-profit { fill: #d49836; }
.split-legend { display: flex; flex-wrap: wrap; gap: 6px 15px; margin-top: 10px; color: var(--muted); font-size: .67rem; }
.split-legend span { display: flex; align-items: center; gap: 5px; }
.split-legend span::before { content: ""; width: 7px; height: 7px; border-radius: 2px; background: #7f7668; }
.split-legend .legend-costs::before { background: #d4c7b2; }
.split-legend .legend-profit::before { background: #d49836; }
.insight { color: var(--muted); font-size: .74rem; margin-bottom: 16px; }
.discount-insight { margin-top: 16px; color: var(--accent-strong); font-weight: 600; }
.result-details { margin-top: 16px; padding: 4px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.result-details summary { min-height: 42px; font-size: .8rem; }
.result-details .breakdown { padding: 8px 0; }
.result-note { margin-top: 14px; padding-top: 0; border-top: 0; font-size: .71rem; }
.result-actions button { min-height: 40px; padding: 8px 13px; font-size: .74rem; }
.no-result h2 { font-size: 1.55rem; line-height: 1.3; overflow-wrap: anywhere; }
.no-result p { color: var(--muted); font-size: .85rem; }
.workspace-scope { margin: 18px 0 0; text-align: center; color: var(--muted); font-size: .73rem; }
.workspace-scope a { margin-left: 4px; }
.tool-explanation { max-width: none; margin-top: 48px; padding-top: 34px; border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 23px; }
.section-heading .eyebrow { margin-bottom: 8px; }
.section-heading h2 { margin-bottom: 0; font-size: 1.75rem; }
.section-heading > a { padding: 5px 0; font-size: .8rem; }
.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.guide-card { min-width: 0; padding: 28px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.guide-icon { display: grid; place-items: center; width: 36px; height: 36px; margin-bottom: 18px; border-radius: 8px; background: var(--soft); color: var(--accent-strong); }
.guide-icon svg { width: 21px; height: 21px; }
.guide-card h3 { margin-bottom: 14px; font-size: 1.25rem; line-height: 1.3; }
.guide-card p { margin-bottom: 18px; color: var(--muted); font-size: .9rem; line-height: 1.7; }
.guide-card .guide-footnote { margin-bottom: 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: .76rem; }
.worked-example .eyebrow { color: var(--accent-strong); font-size: .66rem; margin-bottom: 10px; }
.worked-example .example-assumptions { margin-bottom: 16px; font-size: .72rem; line-height: 1.6; }
.worked-example dl { margin: 0; font-size: .85rem; font-variant-numeric: tabular-nums; }
.worked-example dl > div { display: flex; justify-content: space-between; gap: 16px; padding: 9px 0; border-bottom: 1px solid var(--line); }
.worked-example dt { color: var(--muted); }
.worked-example dd { margin: 0; font-weight: 600; text-align: right; }
.worked-example dl > div:last-child { padding-top: 12px; border-bottom: 0; }
.worked-example dl > div:last-child dt { color: var(--ink); font-weight: 600; }
.worked-example dl > div:last-child dd { color: var(--accent-strong); font-size: 1.1rem; }
.worked-example .example-footnote { margin: 16px 0 0; font-size: .73rem; line-height: 1.55; }
.affiliate-note { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 20px; padding: 18px 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); }
.affiliate-note p { margin: 0; font-size: .82rem; color: var(--ink-soft); }
.affiliate-note .affiliate-label { margin-bottom: 5px; font-size: .62rem; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.affiliate-note .affiliate-disclosure { max-width: 230px; color: var(--muted); font-size: .73rem; line-height: 1.55; }
.tool-faq { display: grid; grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: 55px; max-width: none; margin-top: 48px; padding: 38px 0 0; border-top: 1px solid var(--line); }
.section-intro .eyebrow { margin-bottom: 10px; }
.section-intro h2 { max-width: 320px; font-size: 1.75rem; line-height: 1.2; }
.section-intro > p:not(.eyebrow) { color: var(--muted); font-size: .85rem; }
.section-intro > a { font-size: .8rem; }
.faq-list { min-width: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.faq-item { padding: 0; }
.faq-item + .faq-item { border-top: 1px solid var(--line); }
.faq-item summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 64px; padding: 17px 22px; list-style: none; cursor: pointer; color: var(--ink); font-size: .88rem; font-weight: 600; line-height: 1.45; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--accent-strong); }
.faq-item summary svg { flex: none; width: 18px; height: 18px; color: var(--muted); }
.faq-item[open] .faq-plus { display: none; }
.faq-answer { padding: 0 22px 20px; }
.faq-answer p { margin: 0; color: var(--ink-soft); font-size: .86rem; line-height: 1.75; }
.editorial { margin: 0 auto; line-height: 1.8; }
.editorial > h1 { font-size: clamp(2rem, 4vw, 2.7rem); }
.etsy-fee-summary { margin: 0 0 16px; padding: 2px 0 10px; border-bottom: 1px solid var(--line); }
.etsy-fee-summary p { display: flex; justify-content: space-between; gap: 14px; margin: 0; padding: 6px 0; font-size: .77rem; }
.etsy-fee-summary span { color: var(--muted); }
.etsy-fee-summary strong { font-variant-numeric: tabular-nums; white-space: nowrap; }
.back-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: .8rem; text-decoration: none; }
.directory-heading { max-width: 780px; padding: 32px 0 38px; }
.directory-heading h1 { margin-bottom: 16px; font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -.045em; }
.directory-heading > p:last-child { max-width: 680px; margin: 0; color: var(--muted); }
.directory-group { margin-bottom: 40px; }
.directory-group .section-heading > p { color: var(--muted); font-size: .75rem; }
.directory-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.directory-card { display: flex; flex-direction: column; min-width: 0; padding: 28px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); color: var(--ink); text-decoration: none; transition: border-color var(--speed), box-shadow var(--speed); }
.directory-card:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
.directory-tag { align-self: start; margin-bottom: 20px; padding: 4px 8px; border-radius: 5px; background: var(--soft); color: var(--accent-strong); font-size: .67rem; font-weight: 600; }
.directory-card h2, .directory-card h3 { display: flex; justify-content: space-between; gap: 20px; font-size: 1.35rem; line-height: 1.35; }
.directory-card h2 > span, .directory-card h3 > span { color: var(--muted); }
.directory-card p { color: var(--muted); font-size: .88rem; line-height: 1.7; }
.directory-action { margin-top: auto; padding-top: 16px; color: var(--accent-strong); font-size: .8rem; font-weight: 600; }
.directory-card small { margin-top: 16px; color: var(--muted); font-size: .7rem; }
.directory-note { padding: 26px; border-top: 1px solid var(--line); }
.directory-note h2 { font-size: 1.2rem; }
.directory-note p { margin: 0; color: var(--muted); font-size: .9rem; }
.guide-directory-tool { padding: 28px; }
.guide-directory-tool h2 { font-size: 1.35rem; }
.guide-directory-tool p { color: var(--muted); font-size: .9rem; }
.guide-directory-tool > a { display: block; min-height: 44px; font-size: .84rem; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0; color: var(--muted); font-size: .75rem; }
.guide-heading { max-width: 850px; padding-bottom: 34px; }
.guide-heading h1 { margin-bottom: 18px; font-size: clamp(2rem, 4.2vw, 3.1rem); line-height: 1.15; letter-spacing: -.045em; }
.guide-deck { max-width: 720px; color: var(--ink-soft); font-size: 1.02rem; line-height: 1.7; }
.guide-meta { margin: 22px 0 0; color: var(--muted); font-size: .75rem; }
.guide-body-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); align-items: start; gap: 48px; border-top: 1px solid var(--line); padding-top: 32px; }
.guide-toc { position: sticky; top: 24px; }
.guide-toc p { margin-bottom: 12px; color: var(--muted); font-size: .68rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.guide-toc a { display: block; padding: 10px 0; color: var(--ink-soft); font-size: .79rem; line-height: 1.55; text-decoration: none; }
.guide-toc a:hover { text-decoration: underline; }
.guide-toc .toc-tool { margin-top: 15px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--accent-strong); font-weight: 600; }
.guide-body { max-width: 800px; min-width: 0; }
.guide-body section { margin-bottom: 40px; scroll-margin-top: 24px; }
.guide-body section + section { padding-top: 28px; border-top: 1px solid var(--line); }
.guide-body h2 { margin-top: 0; font-size: 1.55rem; line-height: 1.35; }
.guide-body li + li { margin-top: 10px; }
.formula-box { margin: 24px 0; padding: 22px 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); font-size: .86rem; }
.formula-box p { margin: 0; }
.formula-box p + p { margin-top: 12px; }
.guide-body .comparison { font-size: .83rem; }
.guide-body .comparison td { white-space: nowrap; font-variant-numeric: tabular-nums; }
.guide-body .comparison th { min-width: 115px; }
.guide-cta { margin: 28px 0 0; padding: 24px; border: 1px solid var(--line-strong); border-radius: 12px; background: var(--surface); }
.guide-cta h3 { font-size: 1.3rem; }
.guide-cta .primary-button { display: inline-flex; justify-content: center; gap: 12px; width: auto; text-decoration: none; font-size: .84rem; }
.methodology-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.methodology-nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 9px 12px; border: 1px solid var(--line-strong); border-radius: 7px; background: var(--surface); font-size: .8rem; text-decoration: none; }
.methodology-nav a:hover { border-color: var(--accent); color: var(--accent-strong); }
.editorial #ebay, .market-methodology { scroll-margin-top: 24px; }
.market-methodology { margin-top: 50px; padding-top: 32px; border-top: 1px solid var(--line); }
.market-methodology > .eyebrow { margin-bottom: 12px; }
.editorial section > h2 { margin-top: 0; }
:root[data-theme="dark"] .result-hero { background: #100e0b; }

@media (max-width: 1000px) {
  .page-heading { align-items: start; }
  .source-stamp { max-width: 180px; }
  .workspace-toolbar { gap: 12px; }
  .tool-navigation a { padding: 8px 12px; }
  .section-navigation { gap: 12px; }
  .guide-card { padding: 24px; }
  .tool-faq { gap: 30px; }
}
@media (max-width: 760px) {
  .directory-heading { padding-top: 24px; padding-bottom: 28px; }
  .directory-grid { grid-template-columns: 1fr; gap: 16px; }
  .directory-card { padding: 24px; }
  .directory-group .section-heading > p { margin-bottom: 0; }
  .directory-note { padding: 22px 0; }
  .guide-directory-tool { padding: 16px 0; }
  .guide-body-layout { grid-template-columns: 1fr; gap: 28px; padding-top: 24px; }
  .guide-toc { position: static; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 16px; }
  .guide-toc p, .guide-toc .toc-tool { grid-column: 1 / -1; }
  .guide-toc .toc-tool { margin-top: 5px; padding-top: 12px; }
  .guide-heading { padding-bottom: 24px; }
  .guide-deck { font-size: .94rem; }
  .guide-body h2 { font-size: 1.4rem; }
  .formula-box { padding: 20px; }
  .guide-cta { padding: 21px; }
  .guide-cta .primary-button { width: 100%; }
  .site-header { gap: 6px; padding-top: 12px; padding-bottom: 12px; }
  .site-header nav { padding-top: 0; }
  .site-header nav a { padding-top: 7px; padding-bottom: 7px; }
  .page-heading { display: block; padding-top: 20px; padding-bottom: 18px; }
  .page-heading .eyebrow { display: none; }
  .page-heading h1 { font-size: 2rem; }
  .page-heading > div > p:last-child { font-size: .92rem; }
  .source-stamp { display: inline-flex; max-width: none; margin-top: 10px; font-size: .73rem; }
  .source-stamp svg { width: 20px; height: 20px; }
  .source-stamp small { display: inline; margin-left: 7px; font-size: .67rem; }
  .workspace-toolbar { display: block; margin-bottom: 8px; }
  .tool-navigation { width: 100%; flex-wrap: nowrap; gap: 3px; padding: 4px; }
  .tool-navigation a { flex: 1; min-width: 0; padding: 9px 6px; font-size: .75rem; }
  .tool-navigation a svg { display: none; }
  .section-navigation { margin-top: 4px; gap: 22px; }
  .section-navigation a { min-height: 36px; }
  .workspace-caption { margin-bottom: 12px; }
  .workspace-privacy { display: none; }
  .mobile-result-link { display: inline-flex; min-height: 36px; align-items: center; gap: 6px; font-size: .73rem; }
  .calculator-layout { grid-template-columns: 1fr; gap: 18px; }
  .result-panel { position: static; }
  .panel { padding: 22px; }
  .input-section { margin-bottom: 20px; }
  .listing-grid { grid-template-columns: 1fr; }
  .field-grid .field label { min-height: 3.2em; display: flex; align-items: end; }
  .listing-grid .field label { min-height: 0; }
  .input-wrap input { font-size: 1rem; }
  .select-wrap select { font-size: .9rem; }
  .workspace-scope { text-align: left; font-size: .71rem; }
  .tool-explanation { margin-top: 32px; padding-top: 28px; }
  .section-heading { display: block; margin-bottom: 18px; }
  .section-heading h2 { margin-bottom: 12px; font-size: 1.5rem; }
  .guide-grid { grid-template-columns: 1fr; gap: 16px; }
  .guide-card { padding: 24px; }
  .tool-faq { grid-template-columns: 1fr; gap: 22px; margin-top: 32px; padding-top: 28px; }
  .section-intro h2 { max-width: none; margin-bottom: 12px; font-size: 1.5rem; }
  .section-intro > p:not(.eyebrow) { margin-bottom: 12px; }
  .faq-item summary { padding: 17px 18px; font-size: .86rem; }
  .faq-answer { padding: 0 18px 20px; }
  .affiliate-note { display: block; padding: 18px; }
  .affiliate-note .affiliate-disclosure { max-width: none; margin-top: 12px; }
}
@media (max-width: 390px) {
  .site-header { gap: 10px; }
  .brand { gap: 8px; }
  .brand-wordmark { font-size: 1.05rem; }
  .brand-mark { width: 30px; height: 36px; }
  .theme-switch label { width: 29px; height: 29px; }
  .page-heading h1 { font-size: 1.8rem; }
  .source-stamp { gap: 7px; font-size: .68rem; }
  .source-stamp small { display: block; margin-left: 0; }
  .tool-navigation a { font-size: .69rem; letter-spacing: -.02em; }
  .panel { padding: 18px; }
  .tax-row { gap: 12px; }
  .tax-row > p { font-size: .69rem; }
  .field-grid { gap: 12px; }
  .field label { font-size: .75rem; }
  .advanced summary > span { font-size: .66rem; }
  .result-hero { padding: 22px; }
  .result-hero .amount { font-size: 2.8rem; }
  .guide-card { padding: 21px; }
}

/* ---------- 11. Motion ---------- */
/* Secondary actions keep link semantics and a clear, touch-sized control shape. */
.section-navigation { flex-wrap: wrap; gap: 8px; }
.section-navigation a, .secondary-link {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 9px 13px; border: 1px solid var(--control-line);
  border-radius: var(--r-sm); background: var(--surface); color: var(--ink-soft);
  font-size: .78rem; font-weight: 600; line-height: 1.3; text-decoration: none;
  transition: border-color var(--speed), background var(--speed), color var(--speed);
}
.section-navigation a::after { content: "→"; color: var(--muted); }
.section-navigation a[href^="#"]::after { content: "↓"; }
.section-navigation a:hover, .secondary-link:hover { border-color: var(--accent); background: var(--soft); color: var(--accent-strong); }
.section-navigation a:focus-visible, .secondary-link:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.section-navigation a[aria-current="page"] { background: var(--soft); border-color: var(--ink-soft); color: var(--ink); }
.platform-switch { margin: 0 0 20px; }
.platform-switch a::after { content: none; }
.tool-identity { display: inline-flex; align-items: center; gap: 8px; min-width: 0; color: var(--ink); }
.tool-identity-symbol { display: grid; place-items: center; flex: 0 0 100px; width: 100px; height: 40px; padding: 7px 9px; border: 1px solid #e2e4e7; border-radius: 8px; background: #fff; }
.platform-logo { display: block; width: 80px; height: 24px; object-fit: contain; }
.tool-identity-label { min-width: 0; font-size: .76rem; font-weight: 600; line-height: 1.5; color: var(--muted); }
.directory-card > .tool-identity { margin-bottom: 16px; min-height: 40px; }
.tool-identity--heading { margin-bottom: 10px; gap: 8px; }
.tool-identity--heading .tool-identity-symbol { height: 36px; padding: 5px 9px; }
.tool-identity--generic .tool-identity-label { padding: 5px 10px; border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface-raised); }
.tool-identity--comparison { flex-wrap: wrap; gap: 6px; }
.tool-identity--comparison .tool-identity-label { flex-basis: 100%; }
.platform-logo-group { grid-template-columns: repeat(2, 1fr); gap: 6px 8px; flex-basis: 188px; width: 188px; height: 70px; }
.platform-logo-group .platform-logo { width: 80px; height: 24px; }
.tool-identity--heading .platform-logo-group { height: 70px; padding: 7px 9px; }
.platform-glyph { flex: 0 0 100px; width: 100px; height: 30px; padding: 2px 8px; border: 1px solid #e2e4e7; border-radius: 6px; background: #fff; }
.directory-heading .independence-note { margin-top: 14px; color: var(--muted); font-size: .76rem; line-height: 1.6; }
.independence-note a { color: inherit; text-underline-offset: 3px; }
.directory-jumps { margin-top: 22px; }
.text-button { min-height: 44px; padding: 7px 10px; border: 1px solid var(--control-line); border-radius: var(--r-sm); background: var(--surface); text-decoration: none; }
.text-button:hover { border-color: var(--accent); background: var(--soft); }
.result-actions button { min-height: 44px; }
.unit-input input { padding-left: 14px; }
.unit-input > span { flex: 0 0 auto; padding: 0 12px 0 3px; border-right: 0; font-size: .8rem; }
[data-show] { margin-top: 14px; }
[hidden] { display: none !important; }
.threshold-summary { margin: 20px 0; padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.threshold-summary > p { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; margin: 0; padding: 7px 0; font-size: .8rem; }
.threshold-summary strong { flex: 0 0 auto; font-variant-numeric: tabular-nums; }
.threshold-summary span { color: var(--muted); }
.roas-amount { font-size: clamp(1.65rem, 3vw, 3rem) !important; overflow-wrap: anywhere; }
.platform-input-group { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); }
.platform-input-group:first-child { margin-top: 0; padding-top: 0; border-top: 0; }
.platform-input-group h3 { margin: 0 0 15px; font-size: .93rem; }
.comparison-heading h2 { margin: 8px 0; font-size: 1.7rem; line-height: 1.25; }
.comparison-heading > p:last-child { color: var(--muted); font-size: .85rem; }
.platform-comparison { display: grid; gap: 14px; margin-top: 20px; }
.platform-result { padding: 18px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); break-inside: avoid; }
.platform-result h3 { margin: 0 0 6px; font-size: .9rem; }
.platform-profit { font-size: 1.9rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.platform-result > p { margin: 8px 0 12px; color: var(--muted); font-size: .75rem; }
.platform-result dl { margin: 0; font-size: .75rem; }
.platform-result dl > div { display: flex; gap: 12px; justify-content: space-between; padding: 3px 0; }
.platform-result dd { margin: 0; flex: 0 0 auto; font-variant-numeric: tabular-nums; }
@media (max-width: 760px) {
  .workspace-toolbar { align-items: stretch; }
  .section-navigation { justify-content: flex-start; gap: 7px; }
  .section-navigation a { flex: 1 1 auto; padding: 10px 12px; font-size: .76rem; }
  .platform-switch a { flex: 1 1 65px; }
  .threshold-summary > p { gap: 12px; }
  .platform-result { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
  .tool-card:hover, .primary-button:hover, .brand:hover .brand-mark { transform: none; }
}

/* ---------- 12. Print ---------- */
.print-only { display: none; }
/* Local batch workspace: input, scope, then a separately labelled review. */
.batch-steps { display: flex; flex-wrap: wrap; gap: 12px 30px; padding: 0; margin: 20px 0 25px; list-style: none; color: var(--ink-soft); font-size: .875rem; }
.batch-steps li { display: flex; align-items: center; gap: 10px; }
.batch-steps span { color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.batch-workspace { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.batch-workspace > *, .batch-output { min-width: 0; }
.batch-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.secondary-button { border: 1px solid var(--control-line); border-radius: var(--r-sm); background: var(--surface); color: var(--ink-soft); cursor: pointer; transition: background var(--speed), border-color var(--speed); }
.secondary-button:hover { border-color: var(--accent); background: var(--soft); }
.secondary-button:disabled { cursor: default; opacity: .45; }
.batch-actions .secondary-button { min-height: 44px; padding: 9px 14px; font-size: .8125rem; }
.batch-label { display: block; margin-bottom: 8px; font-size: .875rem; font-weight: 600; }
#csv-input { display: block; width: 100%; min-height: 260px; max-height: 520px; resize: vertical; padding: 14px; border: 1px solid var(--control-line); border-radius: var(--r-sm); background: var(--control-bg); color: var(--ink); font: .8125rem/1.7 ui-monospace, SFMono-Regular, Consolas, monospace; }
#csv-input:focus { outline: 2px solid var(--focus); outline-offset: 2px; }
.batch-input-panel > .primary-button { margin-top: 12px; }
.batch-scope h2 { font-size: 1.4rem; margin: 8px 0 16px; }
.batch-scope p, .batch-scope li { font-size: .875rem; color: var(--ink-soft); }
.batch-scope ul { padding-left: 18px; }
.batch-scope li + li { margin-top: 10px; }
.batch-scope > a { display: block; margin-top: 10px; font-size: .875rem; }
.batch-status { margin: 22px 0; padding: 14px 18px; border-left: 3px solid var(--accent); background: var(--soft); font-size: .875rem; }
.batch-summary { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; padding: 20px 0; }
.batch-summary span { display: block; color: var(--muted); font-size: .8125rem; }
.batch-summary strong { display: block; margin-top: 8px; font-size: clamp(1.25rem, 2.5vw, 1.875rem); overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.batch-summary .negative { color: var(--red); }
.batch-table { width: 100%; min-width: 860px; border-collapse: collapse; font-size: .8125rem; }
.batch-table caption { text-align: left; padding: 12px 0; color: var(--muted); }
.batch-table th, .batch-table td { padding: 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.batch-table thead { background: var(--soft); }
.batch-table th:nth-child(n+4):nth-child(-n+7), .batch-table td:nth-child(n+4):nth-child(-n+7) { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.batch-table td:nth-child(2) { max-width: 180px; overflow-wrap: anywhere; }
.batch-table td:last-child { min-width: 220px; max-width: 320px; }
.batch-invalid td:last-child { color: var(--red); font-weight: 600; }
.batch-reference { margin-top: 50px; }
.batch-reference code { overflow-wrap: anywhere; }
.batch-id-list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px 20px; }
.batch-id-list dd { margin: 3px 0 0; color: var(--muted); font-size: .875rem; }
@media (max-width: 760px) {
  .batch-workspace { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .batch-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .batch-id-list { grid-template-columns: minmax(0, 1fr); }
  .batch-output .section-heading { display: block; }
  .batch-output .batch-actions { margin-top: 14px; }
}
@media print {
  .input-panel .field-note, .input-panel .field small, .tax-row > p { display: none !important; }
  #calculator[data-kind="amazon"] small, #calculator[data-kind="shopify"] small, #calculator[data-kind="comparison"] small,
  #calculator .platform-input-group > .field-note { display: none !important; }
  .platform-switch { display: none !important; }
  .page-heading .tool-identity { display: none !important; }
  [data-show] { margin-top: 7px; }
  #calculator[data-kind="amazon"] .input-section, #calculator[data-kind="shopify"] .input-section, #calculator[data-kind="comparison"] .input-section { break-inside: auto; }
  .platform-input-group { break-inside: avoid; }
  .platform-comparison { grid-template-columns: 1fr 1fr; gap: 8px; }
  .platform-result { padding: 10px; }
  .platform-profit { font-size: 18pt; }
  .threshold-summary { margin: 10px 0; padding: 5px 0; }
  .threshold-summary > p { font-size: 8pt; padding: 3px 0; }
  #calculator[data-kind="etsy"] .field small, #calculator[data-kind="etsy"] .field-note, .etsy-fee-summary { display: none !important; }
  .guide-toc, .guide-cta, .breadcrumbs, .methodology-nav { display: none !important; }
  .guide-body-layout { display: block; padding: 0; border: 0; }
  .guide-body { max-width: none; }
  .guide-body section { break-inside: auto; }
  .formula-box, .guide-body table { break-inside: avoid; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  :root[data-theme], :root:not([data-theme]) {
    color-scheme: light;
    --bg: #fff; --surface: #fff; --surface-raised: #fff; --ink: #000; --ink-soft: #000;
    --muted: #333; --line: #bbb; --line-strong: #bbb; --hairline: #ccc;
    --accent: #000; --accent-strong: #000; --soft: #fff;
    --red: #8d1829; --error-bg: #fff; --error-line: #999;
    --control-bg: #fff; --control-line: #999; --control-line-hover: #666;
    --button-bg: #000; --button-ink: #fff; --button-hover: #000;
    --result-bg: #fff; --result-line: #bbb; --focus: #000; --ring: transparent;
    --shadow-sm: none; --shadow-md: none; --shadow-lg: none;
    --brand-bg: transparent; --brand-padding: 0;
  }
  body { background: #fff; color: #000; font-size: 10pt; line-height: 1.35; }
  .site-header, .site-footer, .skip-link, .related, .tool-explanation, .tool-faq, .theme-switch, .analytics-banner, .analytics-dialog, .affiliate-note, .workspace-toolbar, .workspace-caption, .source-stamp, .workspace-scope, .revenue-split, .result-heading, .result-status,
  .text-button, .primary-button, .result-actions, .save-row, .presets, .small-status { display: none !important; }
  .container { max-width: none; padding: 0; }
  .page-heading { padding-top: 0; }
  .page-heading h1 { font-size: 22pt; }
  .page-heading .eyebrow { display: none; }
  .page-heading > div > p:last-child { font-size: 9pt; }
  .scope { margin-bottom: 12px; padding: 8px 0; }
  .scope a { display: none; }
  .calculator-layout { display: block; }
  .panel { margin-bottom: 15px; padding: 12px; border: 1px solid #bbb; background: #fff; break-inside: avoid; }
  .input-panel { break-inside: auto; }
  .panel-heading { margin-bottom: 10px; }
  .input-section { break-inside: avoid; }
  .input-section legend { margin-bottom: 7px; font-size: 9pt; }
  .amount, .amount.amount-long { font-size: 30pt; }
  .comparison-scroll { overflow: visible; }
  .select-chevron { display: none; }
  .input-wrap, .input-wrap input, .select-wrap select { min-height: 0; }
  .input-wrap > span { padding: 0 8px; font-size: 9pt; }
  .input-wrap input, .select-wrap select { padding: 4px; font-size: 10pt; }
  .field label { margin-bottom: 3px; font-size: 9pt; }
  .field-grid .field label { min-height: 0; display: block; }
  .field-note { margin-top: 5px; font-size: 8pt; }
  .field { margin-bottom: 6px; }
  .field-grid { gap: 6px; }
  .step-number { width: 18px; height: 18px; font-size: 7pt; }
  .advanced { margin-top: 10px; }
  .advanced summary { min-height: 0; padding: 4px 0; font-size: 9pt; }
  .result-panel { position: static; break-before: page; break-inside: auto; }
  .result-hero { padding: 0; background: #fff !important; color: #000; break-inside: avoid; }
  .result-hero .amount, .result-hero .amount.amount-long { font-size: 30pt; }
  .result-hero .amount, .result-hero .result-subtitle, .result-hero > p:first-child { color: #000; }
  .result-panel #result { opacity: 1 !important; }
  .page-heading { display: block; padding-bottom: 8px; }
  .input-section { margin-bottom: 10px; }
  .input-section + .input-section { padding-top: 10px; }
  .tax-row { margin-top: 10px; }
  .result-note { margin-top: 10px; }
  .field small { font-size: 8pt; }
  .form-section { margin-top: 10px; }
  .result-details .breakdown { display: block; }
  .result-details .breakdown > div { padding: 5px 0; }
  .comparison th, .comparison td { padding: 6px 8px; font-size: 9pt; }
  .result-stats { margin: 10px 0; }
  .result-stats > div { padding: 3px 0; }
  .print-source { display: block; margin: 10px 0 0; font-size: 8pt; }
  .print-invalid #result { display: none; }
  .print-invalid .print-error { display: block; font-weight: 700; }
  .result-details summary { min-height: 0; padding: 6px 0; }
  a { color: #000; }
}