.page-tool main { background-color: var(--surface-alt); background-image: linear-gradient(var(--line-soft) 1px, transparent 1px), linear-gradient(90deg, var(--line-soft) 1px, transparent 1px); background-size: 24px 24px; border-top: 1px solid var(--line); }
.tool-page { padding-block: 40px 72px; }
.tool-breadcrumb { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; font-size: 13px; color: var(--muted); }
.tool-breadcrumb a { padding-block: 0; color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.tool-heading { max-width: 760px; margin-top: 28px; }
.tool-heading h1 { margin-top: 14px; font-size: clamp(32px, 4vw, 46px); font-weight: 550; letter-spacing: -.035em; }
.tool-heading .tool-lead { margin-top: 16px; color: var(--muted); font-size: 17px; line-height: 1.7; }
.tool-heading .eyebrow { display: flex; align-items: center; gap: 10px; }

.tool-tag { display: inline-block; padding: 3px 9px; background: var(--surface-blue); border: 1px solid var(--line-blue); border-radius: 2px; color: var(--blue); font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .08em; }

.tool-card { min-width: 0; background: var(--surface); border: 1px solid var(--ink); border-radius: 3px; box-shadow: 4px 4px 0 var(--ink); }
.tool-card-header { display: flex; align-items: center; gap: 10px; padding: 12px 20px; border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
.tool-card-header .step-index { color: var(--blue); }
.tool-card-body { padding: 22px 20px 24px; }

.tool-workspace { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 32px; align-items: start; margin-top: 36px; }

/* 1. Inputs */
.tool-fields { display: grid; gap: 18px; margin: 0; padding: 0; border: 0; }
.tool-field { display: grid; gap: 6px; }
.tool-field label { font-size: 14px; font-weight: 600; }
.tool-field .field-hint { color: var(--muted); font-size: 12px; line-height: 1.5; }
.tool-input { display: flex; align-items: stretch; border: 1px solid var(--muted); border-radius: 2px; background: var(--surface); }
.tool-input:focus-within { outline: 3px solid var(--blue); outline-offset: 1px; }
.tool-input input, .tool-input select { flex: 1; min-width: 0; min-height: 44px; padding: 8px 12px; border: 0; background: transparent; color: var(--ink); font: inherit; font-family: var(--mono); font-size: 15px; font-variant-numeric: tabular-nums; }
.tool-input input:focus, .tool-input select:focus { outline: none; }
.tool-input .unit { display: flex; align-items: center; padding: 0 12px; border-left: 1px solid var(--line); background: var(--table-head); color: var(--muted); font-family: var(--mono); font-size: 13px; white-space: nowrap; }
.tool-field[data-invalid] .tool-input { border-color: var(--rust); }
.tool-field .field-error { color: var(--rust); font-size: 12px; }
.tool-reset { margin-top: 20px; padding: 0; border: 0; background: none; color: var(--muted); font: inherit; font-size: 13px; text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }
.tool-reset:hover { color: var(--blue); }

/* 2. Results */
.tool-results { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin: 0; }
.tool-results > div { padding: 14px 14px 16px; background: var(--paper); border: 1px solid var(--line); border-radius: 2px; }
.tool-results dt { color: var(--muted); font-family: var(--mono); font-size: 11px; letter-spacing: .06em; }
.tool-results dd { margin-top: 8px; color: var(--blue); font-family: var(--mono); font-size: clamp(28px, 3vw, 36px); font-weight: 600; line-height: 1.1; font-variant-numeric: tabular-nums; overflow-wrap: break-word; }
.tool-results dd .unit { margin-left: 6px; color: var(--muted); font-size: 14px; font-weight: 500; }
.tool-summary { margin-top: 18px; padding: 4px 0 4px 16px; border-left: 3px solid var(--blue); font-size: 15px; line-height: 1.7; }
.tool-summary[data-state="error"] { border-left-color: var(--rust); color: var(--rust); }
.tool-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.tool-button { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 10px 16px; border: 1px solid var(--ink); border-radius: 3px; background: var(--surface); color: var(--ink); font: inherit; font-size: 13px; font-weight: 600; cursor: pointer; }
.tool-button:hover { border-color: var(--blue); color: var(--blue); }
.tool-button:focus-visible, .tool-reset:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.tool-button svg { width: 16px; height: 16px; fill: none; stroke: var(--blue); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.tool-share-note { margin-top: 8px; color: var(--muted); font-size: 12px; }
.tool-status { min-height: 1.6em; margin-top: 10px; color: var(--muted); font-size: 12px; }

.tool-output { display: grid; gap: 8px; min-width: 0; }
.tool-details { padding: 14px 20px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 3px; }
.tool-details h3 { font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.tool-details table { width: 100%; margin-top: 8px; border-collapse: collapse; font-size: 13px; line-height: 1.5; }
.tool-details th, .tool-details td { padding: 7px 0; border-top: 1px solid var(--line-soft); text-align: left; vertical-align: top; }
.tool-details th { width: 38%; padding-right: 12px; color: var(--muted); font-weight: 500; }
.tool-details td { font-variant-numeric: tabular-nums; overflow-wrap: break-word; }

/* 3. Method */
.tool-method { margin-top: 48px; }
.tool-method details + details { border-top: 1px solid var(--line); }
.tool-method summary { display: flex; align-items: baseline; gap: 12px; padding: 18px 20px; cursor: pointer; font-size: 18px; font-weight: 600; list-style: none; }
.tool-method summary::-webkit-details-marker { display: none; }
.tool-method summary::before { content: "+"; width: 14px; color: var(--blue); font-family: var(--mono); }
.tool-method details[open] summary::before { content: "−"; }
.tool-method summary:focus-visible { outline: 3px solid var(--blue); outline-offset: -3px; }
.tool-method .section-letter { color: var(--blue); font-family: var(--mono); font-size: 13px; }
.tool-method .method-body { max-width: 760px; padding: 0 20px 26px 46px; font-size: 16px; line-height: 1.8; }
.tool-method .method-body > * + * { margin-top: 16px; }
.tool-method .method-body ul, .tool-method .method-body ol { padding-left: 22px; }
.tool-method .formula { padding: 14px 16px; background: var(--paper); border: 1px solid var(--line); overflow-x: auto; font-family: var(--mono); font-size: 15px; white-space: nowrap; }
.tool-method table { border-collapse: collapse; width: 100%; font-size: 14px; font-variant-numeric: tabular-nums; }
.tool-method th, .tool-method td { padding: 8px 12px; border-bottom: 1px solid var(--line); text-align: left; }
.tool-method th { background: var(--table-head); }

/* 4. Related, further reading, product line */
.tool-more { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 48px; }
.tool-more h2 { font-size: 18px; font-weight: 600; }
.tool-more ul { margin: 14px 0 0; padding: 0; list-style: none; }
.tool-more li { padding-block: 10px; border-bottom: 1px solid var(--line); font-size: 15px; }
.tool-more li a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.tool-more li .tool-tag { margin-right: 10px; }
.tool-more li .soon { color: var(--muted); font-size: 13px; }
.tool-product-line { margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.tool-product-line a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }

.ad-slot { display: none; }

/* Overview page */
.tool-index-count { margin-top: 14px; color: var(--muted); font-family: var(--mono); font-size: 12px; letter-spacing: .08em; }
.tool-index-section { margin-top: 44px; }
.tool-index-section h2 { display: flex; align-items: baseline; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); font-size: 20px; font-weight: 600; }
.tool-index-section h2 .step-index { color: var(--blue); font-family: var(--mono); font-size: 13px; }
.tool-index { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; margin: 20px 0 0; padding: 0; list-style: none; }
.tool-index-card { display: flex; flex-direction: column; gap: 10px; min-width: 0; padding: 20px 20px 18px; background: var(--surface); border: 1px solid var(--ink); border-radius: 3px; box-shadow: 4px 4px 0 var(--ink); }
.tool-index-card h3 { font-size: 19px; font-weight: 600; line-height: 1.3; letter-spacing: -.01em; }
.tool-index-card h3 a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.tool-index-card p { color: var(--muted); font-size: 15px; line-height: 1.6; }
.tool-index-card .tool-index-meta { display: flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 4px; }
.tool-index-card[data-status="planned"] { background: transparent; border-color: var(--line); box-shadow: none; }
.tool-index-card[data-status="planned"] h3, .tool-index-card[data-status="planned"] p { color: var(--muted); }
.tool-index-card[data-status="planned"] .tool-tag { background: transparent; border-color: var(--line); color: var(--muted); }
.tool-index-card .soon { color: var(--muted); font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.tool-index-note { margin-top: 24px; color: var(--muted); font-size: 15px; }
.tool-index-note a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 900px) {
  .tool-workspace { grid-template-columns: 1fr; gap: 28px; }
  .tool-more { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 540px) {
  .tool-page { padding-block: 28px 48px; }
  .tool-card-body { padding: 18px 16px 20px; }
  .tool-method summary { padding: 16px; font-size: 17px; }
  .tool-method .method-body { padding: 0 16px 22px; }
}