/* Shared free-tool stylesheet. Each tool folder carries its own copy (projects share no code — specs/projects.md);
   brand tokens mirror the root site's public/assets/css/style.css. */

:root {
  --navy: #0a1f44;
  --blue: #2f6fed;
  --blue-dark: #2557c7;
  --text: #16213a;
  --muted: #57647a;
  --faint: #8592a6;
  --border: #e4e9f1;
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --good: #0f7a4d;
  --good-bg: #e8f6ef;
  --warn: #9a5b00;
  --warn-bg: #fff4dd;
  --bad: #b3261e;
  --bad-bg: #fdeceb;
  --radius-sm: 8px;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(10, 31, 68, 0.08);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
h1, h2, h3 { line-height: 1.25; color: var(--navy); }
.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 24px; }
.narrow { max-width: 820px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--blue); color: #fff; padding: 8px 16px; z-index: 200; }
.skip-link:focus { left: 8px; top: 8px; }

/* Brand header (same look as the personal site) */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.92); backdrop-filter: saturate(180%) blur(10px); -webkit-backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--border); }
.site-header__inner, .tool-bar__inner { max-width: 1120px; margin: 0 auto; padding-inline: 24px; display: flex; align-items: center; justify-content: space-between; }
.site-header__inner { height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1rem; letter-spacing: 0.01em; color: var(--navy); text-decoration: none; }
.logo-mark { width: 36px; height: 36px; border-radius: 9px; background: linear-gradient(135deg, var(--navy), var(--blue)); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 0.85rem; font-weight: 800; flex-shrink: 0; }
.nav-desktop { display: flex; align-items: center; gap: 22px; }
.nav-links { display: flex; gap: 20px; list-style: none; margin: 0; padding: 0; }
.nav-links a { font-size: 0.92rem; font-weight: 600; color: var(--muted); white-space: nowrap; text-decoration: none; transition: color 0.15s ease; }
.nav-links a:hover, .nav-links a[aria-current="true"] { color: var(--blue); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 8px; font-family: inherit; font-weight: 600; border: 1px solid transparent; text-decoration: none; cursor: pointer; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease; }
.btn-sm { padding: 9px 16px; font-size: 0.85rem; }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 6px 18px rgba(47, 111, 237, 0.28); }
.btn-primary:hover { background: var(--blue-dark); color: #fff; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy); margin: 5px 0; }
.nav-mobile { display: none; flex-direction: column; gap: 4px; padding: 12px 24px 20px; border-top: 1px solid var(--border); background: #fff; }
.nav-mobile.is-open { display: flex; }
.nav-mobile a { padding: 12px 0; font-weight: 600; color: var(--text); text-decoration: none; border-bottom: 1px solid var(--border); }
.tool-bar { background: var(--bg-alt); border-bottom: 1px solid var(--border); }
.tool-bar__inner { min-height: 46px; gap: 16px; }
.tool-bar__title { font-size: 0.92rem; font-weight: 800; color: var(--navy); text-decoration: none; }
.tool-bar__nav { display: flex; gap: 20px; list-style: none; margin: 0; padding: 0; }
.tool-bar__nav a { font-size: 0.88rem; font-weight: 600; color: var(--muted); text-decoration: none; }
.tool-bar__nav a:hover { color: var(--blue); }
@media (max-width: 760px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: block; }
  .tool-bar__nav { display: none; }
}

/* Page */
.hero { padding: 48px 0 28px; }
.badge-free { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; background: var(--good-bg); color: var(--good); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; }
.hero h1 { margin: 14px 0 10px; font-size: clamp(1.7rem, 4vw, 2.5rem); letter-spacing: -0.01em; }
.hero__lead { margin: 0; max-width: 720px; color: var(--muted); font-size: 1.08rem; }
.hero__free { margin: 12px 0 0; color: var(--text); font-weight: 600; font-size: 0.95rem; }

.panel { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.tabs { display: flex; gap: 6px; padding: 4px; margin-bottom: 20px; background: var(--bg-alt); border-radius: 10px; }
.tab { flex: 1; padding: 10px 12px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font: inherit; font-weight: 700; font-size: 0.92rem; cursor: pointer; }
.tab[aria-selected="true"] { background: #fff; color: var(--navy); box-shadow: 0 1px 3px rgba(10, 31, 68, 0.12); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 20px; }
.form-grid .full { grid-column: 1 / -1; }
.group-title { margin: 8px 0 -4px; font-size: 0.85rem; font-weight: 800; color: var(--navy); text-transform: uppercase; letter-spacing: 0.05em; grid-column: 1 / -1; }
.field label { display: block; margin-bottom: 6px; font-size: 0.9rem; font-weight: 600; }
.field input, .field select { width: 100%; padding: 11px 12px; border: 1px solid #cfd7e4; border-radius: var(--radius-sm); font: inherit; background: #fff; color: var(--text); }
.field input[aria-invalid="true"] { border-color: var(--bad); }
.hint { margin: 5px 0 0; font-size: 0.82rem; color: var(--faint); }
.error { margin: 5px 0 0; font-size: 0.85rem; color: var(--bad); font-weight: 600; }
.error:empty { display: none; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } .panel { padding: 18px; } }

.results { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--border); }
.results h2 { margin: 0 0 14px; font-size: 1.15rem; }
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; margin-bottom: 18px; }
.metric { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px 16px; }
.metric strong { display: block; font-size: 1.55rem; line-height: 1.2; color: var(--navy); font-variant-numeric: tabular-nums; }
.metric span { font-size: 0.85rem; color: var(--muted); }
.verdict { padding: 14px 16px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg-alt); margin-bottom: 14px; }
.verdict.is-good { background: var(--good-bg); border-color: #b7e2cd; }
.verdict.is-warn { background: var(--warn-bg); border-color: #f0d9a3; }
.verdict.is-bad { background: var(--bad-bg); border-color: #f2c1bd; }
.verdict p { margin: 0; }
.verdict p + p { margin-top: 8px; }
.verdict strong.title { display: block; margin-bottom: 4px; }
.notes { margin: 0; padding-left: 20px; color: var(--muted); font-size: 0.92rem; }
.notes li + li { margin-top: 6px; }
.empty-state { color: var(--muted); margin: 0; }

/* Content sections */
.section { padding: 48px 0 0; }
.section h2 { font-size: 1.5rem; margin: 0 0 12px; }
.section p, .section li { color: var(--text); }
.section .muted { color: var(--muted); }
.formula { margin: 12px 0; padding: 14px 16px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow-x: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.88rem; white-space: pre; }
.faq details { border-bottom: 1px solid var(--border); padding: 14px 0; }
.faq summary { font-weight: 700; cursor: pointer; color: var(--navy); }
.faq details p { margin: 10px 0 0; color: var(--muted); }
.related { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 12px 0 0; list-style: none; }
.related a { display: inline-block; padding: 8px 14px; border: 1px solid var(--border); border-radius: 999px; text-decoration: none; font-weight: 600; font-size: 0.9rem; }

.disclaimer { margin-top: 56px; padding: 22px 24px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); }
.disclaimer h2 { margin: 0 0 8px; font-size: 1rem; }
.disclaimer p { margin: 0; font-size: 0.86rem; color: var(--muted); }
.site-footer { margin-top: 32px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem; }
.site-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding-block: 22px; }
.site-footer p { margin: 0; }

/* Business-friendly additions (ADR-005): steps, headline answer, range bar, bars, advanced/technical details, glossary */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 0 0 24px; padding: 0; list-style: none; counter-reset: step; }
.steps li { position: relative; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px 14px 56px; font-size: 0.92rem; color: var(--muted); counter-increment: step; }
.steps li::before { content: counter(step); position: absolute; left: 16px; top: 14px; width: 28px; height: 28px; border-radius: 50%; background: var(--navy); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 0.9rem; }
.steps strong { display: block; color: var(--navy); font-size: 1rem; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }

.answer { padding: 20px 22px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg-alt); margin-bottom: 16px; }
.answer.is-good { background: var(--good-bg); border-color: #b7e2cd; }
.answer.is-warn { background: var(--warn-bg); border-color: #f0d9a3; }
.answer.is-bad { background: var(--bad-bg); border-color: #f2c1bd; }
.answer .headline { margin: 0 0 6px; font-size: 1.3rem; font-weight: 800; color: var(--navy); line-height: 1.3; }
.answer .big { font-size: 2.2rem; letter-spacing: -0.01em; }
.answer p { margin: 0; }
.answer p + p { margin-top: 8px; }
.tag-label { display: inline-block; margin-bottom: 8px; padding: 3px 10px; border-radius: 999px; background: #fff; border: 1px solid var(--border); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; color: var(--navy); }
.result-block { margin: 22px 0 0; }
.result-block h3 { margin: 0 0 8px; font-size: 1.05rem; }
.result-block p { margin: 0 0 8px; }
.todo-list { margin: 0; padding-left: 20px; }
.todo-list li + li { margin-top: 6px; }

.range { margin: 14px 0 6px; }
.range__track { position: relative; height: 16px; background: #e9eef6; border-radius: 999px; }
.range__zero { position: absolute; top: -6px; bottom: -6px; width: 2px; background: var(--navy); left: 50%; }
.range__bar { position: absolute; top: 0; bottom: 0; border-radius: 999px; background: var(--warn); opacity: 0.85; min-width: 4px; }
.range__bar.is-good { background: var(--good); }
.range__bar.is-bad { background: var(--bad); }
.range__dot { position: absolute; top: -3px; width: 22px; height: 22px; margin-left: -11px; border-radius: 50%; background: #fff; border: 3px solid var(--navy); }
.range__labels { display: flex; justify-content: space-between; margin-top: 10px; font-size: 0.8rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.range__labels strong { color: var(--navy); }

.bars { list-style: none; margin: 8px 0 0; padding: 0; }
.bars li { display: grid; grid-template-columns: minmax(90px, 200px) 1fr 72px; align-items: center; gap: 12px; padding: 6px 0; font-size: 0.92rem; }
.bars .bars__track { height: 18px; background: #e9eef6; border-radius: 6px; overflow: hidden; }
.bars .bars__fill { height: 100%; background: var(--blue); border-radius: 6px; }
.bars li.is-up .bars__fill { background: var(--good); }
.bars li.is-down .bars__fill { background: var(--bad); }
.bars .bars__val { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.bars .bars__note { grid-column: 2 / 4; margin-top: -4px; font-size: 0.8rem; color: var(--muted); }
@media (max-width: 640px) { .bars li { grid-template-columns: 1fr 64px; } .bars .bars__track { grid-column: 1 / -1; order: 3; } .bars .bars__note { grid-column: 1 / -1; } }

details.advanced, details.technical { margin: 16px 0 0; border: 1px solid var(--border); border-radius: var(--radius-sm); background: #fff; }
details.advanced > summary, details.technical > summary { cursor: pointer; padding: 12px 14px; font-weight: 700; color: var(--navy); font-size: 0.92rem; }
details.advanced[open] > summary, details.technical[open] > summary { border-bottom: 1px solid var(--border); }
details.advanced > .form-grid, details.technical > .inner { padding: 14px; }
details.technical .obs-table { margin-bottom: 0; }

.glossary { margin: 14px 0 0; }
.glossary dt { margin-top: 16px; font-weight: 800; color: var(--navy); }
.glossary dd { margin: 4px 0 0; color: var(--text); }
.glossary .analogy { display: block; margin-top: 4px; color: var(--muted); font-style: italic; }
.example { margin: 14px 0; padding: 16px 18px; background: var(--bg-alt); border: 1px solid var(--border); border-left: 4px solid var(--blue); border-radius: var(--radius-sm); }
.example p { margin: 0; }
.example p + p { margin-top: 8px; }
.checklist { margin: 8px 0 0; padding-left: 22px; }
.checklist li + li { margin-top: 6px; }
.callout { margin: 14px 0; padding: 14px 16px; background: #eef4ff; border: 1px solid #cfe0ff; border-radius: var(--radius-sm); font-size: 0.95rem; }
.callout p { margin: 0; }
.preview { margin: 6px 0 0; font-size: 0.85rem; color: var(--good); font-weight: 600; }
.help { margin: 5px 0 0; font-size: 0.85rem; color: var(--muted); }

/* Share & favorites bar: plain links, no third-party widgets */
.share-bar { margin-top: 48px; padding: 20px 24px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-alt); }
.share-title { margin: 0 0 12px; font-size: 1rem; font-weight: 700; color: var(--navy); }
.share-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.share-btn { display: inline-flex; align-items: center; padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: #fff; color: var(--navy); font: inherit; font-size: 0.88rem; font-weight: 700; line-height: 1.3; text-decoration: none; cursor: pointer; }
.share-btn:hover { border-color: var(--blue); color: var(--blue); }
.share-btn:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
.share-btn[hidden] { display: none; }
.share-status { margin: 10px 0 0; min-height: 1.4em; font-size: 0.88rem; color: var(--muted); }