/* CalculatorBin — fonts (self-hosted, SIL OFL) */
@font-face { font-family: "Inter"; src: url("/fonts/inter.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: "Bricolage Grotesque"; src: url("/fonts/bricolage.woff2") format("woff2"); font-weight: 200 800; font-style: normal; font-display: swap; }

/* CalculatorBin — design tokens */
:root {
  --bg: #f6f4ee;
  --surface: #ffffff;
  --surface-2: #efece3;
  --ink: #1a1d24;
  --ink-2: #4a4f5c;
  --ink-3: #6e7381;
  --line: #dcd8cc;
  --accent: #d9480f;
  --accent-ink: #ffffff;
  --accent-soft: #fde6d8;
  --focus: #1d5fa8;
  --res-bg: #1a1d24;
  --res-ink: #f6f4ee;
  --res-muted: #b9bcc6;
  --res-accent: #ff8a4c;
  --warn-bg: #fff4d6;
  --warn-ink: #6b4a00;
  --c-home: #d9480f;
  --c-garden: #2f7d32;
  --c-cooking: #9c3d54;
  --c-energy: #1d5fa8;
  --c-money: #0e7c66;
  --c-everyday: #6a45c9;
  --radius: 14px;
  --radius-s: 9px;
  --shadow: 0 1px 2px rgba(26, 29, 36, .06), 0 6px 24px rgba(26, 29, 36, .06);
  --max: 1160px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --display: "Bricolage Grotesque", "Inter", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --surface: #1b1e24;
    --surface-2: #23272f;
    --ink: #eceae4;
    --ink-2: #c3c6cf;
    --ink-3: #9a9eaa;
    --line: #333844;
    --accent: #ff7a3d;
    --accent-ink: #1a1d24;
    --accent-soft: #3a2418;
    --focus: #7fb2ff;
    --res-bg: #0b0c0f;
    --res-ink: #f6f4ee;
    --res-muted: #a6a9b3;
    --res-accent: #ff9a63;
    --warn-bg: #3a3014;
    --warn-ink: #ffe39a;
    --c-home: #ff7a3d;
    --c-garden: #6cc070;
    --c-cooking: #e27a95;
    --c-energy: #7fb2ff;
    --c-money: #4fc7a9;
    --c-everyday: #b39cff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 var(--font); text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; margin: 0 0 .5em; font-family: var(--display); }
.brand, .res-value, .cat-card h3 { font-family: var(--display); }
body { font-feature-settings: "cv11", "ss01"; -webkit-font-smoothing: antialiased; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }
h1 { font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.6rem); font-weight: 800; }
h2 { font-size: clamp(1.3rem, 1.1rem + .8vw, 1.6rem); font-weight: 750; margin-top: 2rem; }
h3 { font-size: 1.1rem; font-weight: 700; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--bg); padding: 8px 12px; z-index: 99; }
.skip:focus { left: 8px; top: 8px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- header ---------- */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.hdr { display: flex; align-items: center; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; white-space: nowrap; }
.brand svg { width: 34px; height: 34px; flex: none; }
.brand b { color: var(--accent); font-weight: 800; }
.brand:hover { color: inherit; }
.hdr-search { position: relative; flex: 1; max-width: 360px; margin-left: auto; }
.hdr-search input, .hero-search input {
  width: 100%; font: inherit; color: var(--ink); background: var(--surface-2);
  border: 1px solid var(--line); border-radius: 999px; padding: 9px 14px 9px 38px;
}
.hdr-search svg, .hero-search svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); width: 17px; height: 17px; color: var(--ink-3); pointer-events: none; }
.search-results { position: absolute; left: 0; right: 0; top: calc(100% + 6px); list-style: none; margin: 0; padding: 6px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); box-shadow: var(--shadow); z-index: 30; max-height: 70vh; overflow: auto; }
.search-results a { display: flex; flex-direction: column; padding: 8px 10px; border-radius: 7px; text-decoration: none; }
.search-results a small { color: var(--ink-3); font-size: .8rem; }
.search-results a:hover, .search-results a.active { background: var(--accent-soft); color: var(--ink); }
.search-results .none { padding: 10px; color: var(--ink-3); font-size: .9rem; }
.site-nav ul { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.site-nav a { display: block; padding: 8px 12px; border-radius: 8px; text-decoration: none; font-weight: 600; font-size: .95rem; color: var(--ink-2); }
.site-nav a:hover, .site-nav a[aria-current="page"] { background: var(--surface-2); color: var(--ink); }
.menu-btn { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; color: var(--ink); font: inherit; font-weight: 600; cursor: pointer; }
@media (max-width: 900px) {
  .hdr { flex-wrap: wrap; padding: 10px 0; gap: 10px; }
  .menu-btn { display: block; margin-left: auto; }
  .hdr-search { order: 3; max-width: none; flex-basis: 100%; margin: 0; }
  .site-nav { order: 4; flex-basis: 100%; display: none; }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; padding-bottom: 8px; }
}

/* ---------- breadcrumbs ---------- */
.crumbs { font-size: .88rem; color: var(--ink-3); margin: 22px 0 10px; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs li + li::before { content: "›"; margin-right: 6px; color: var(--ink-3); }
.crumbs a { text-decoration: none; color: var(--ink-2); }

/* ---------- hero ---------- */
.hero {
  background:
    linear-gradient(var(--bg) 0, transparent 70%),
    repeating-linear-gradient(0deg, transparent 0 27px, var(--line) 27px 28px),
    repeating-linear-gradient(90deg, transparent 0 27px, var(--line) 27px 28px);
  border-bottom: 1px solid var(--line);
  padding: 56px 0 44px;
}
.hero h1 { max-width: 18ch; }
.hero p.lead { font-size: 1.15rem; color: var(--ink-2); max-width: 58ch; }
.hero-search { position: relative; max-width: 560px; margin-top: 22px; }
.hero-search input { padding: 15px 18px 15px 44px; font-size: 1.05rem; background: var(--surface); box-shadow: var(--shadow); }
.hero-search svg { left: 16px; width: 20px; height: 20px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 18px; color: var(--ink-3); font-size: .92rem; }
.hero-stats span::before { content: "✓ "; color: var(--c-garden); font-weight: 700; }

/* ---------- cards ---------- */
.section { padding: 34px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.section-head h2 { margin: 0 0 14px; }
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.cat-card { position: relative; display: flex; flex-direction: column; gap: 6px; padding: 20px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; box-shadow: var(--shadow); border-top: 4px solid var(--cat, var(--accent)); }
.cat-card:hover { color: inherit; transform: translateY(-2px); transition: transform .15s; }
.cat-card h3 { margin: 6px 0 0; font-size: 1.15rem; }
.cat-card p { color: var(--ink-2); font-size: .95rem; margin: 0; }
.cat-card .count { font-size: .85rem; color: var(--ink-3); margin-top: auto; padding-top: 8px; }
.cat-icon { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: var(--surface-2); color: var(--cat, var(--accent)); }
.cat-icon svg { width: 24px; height: 24px; }
.c-home { --cat: var(--c-home); }
.c-lawn-garden, .c-garden { --cat: var(--c-garden); }
.c-cooking { --cat: var(--c-cooking); }
.c-home-energy, .c-energy { --cat: var(--c-energy); }
.c-home-improvement { --cat: var(--c-home); }
.c-money { --cat: var(--c-money); }
.c-everyday { --cat: var(--c-everyday); }

.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; list-style: none; padding: 0; margin: 0; }
.tool-grid a { display: flex; gap: 10px; align-items: flex-start; padding: 13px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); text-decoration: none; height: 100%; border-left: 3px solid var(--cat, var(--accent)); }
.tool-grid a:hover { border-color: var(--cat, var(--accent)); color: inherit; }
.tool-grid strong { display: block; font-weight: 650; line-height: 1.3; }
.tool-grid span { display: block; font-size: .86rem; color: var(--ink-3); margin-top: 3px; line-height: 1.4; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.chips button { font: inherit; font-size: .9rem; font-weight: 600; padding: 6px 13px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.chips button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.why { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.why div { padding: 18px; border-radius: var(--radius); background: var(--surface-2); }
.why h3 { margin-bottom: 6px; }
.why p { margin: 0; color: var(--ink-2); font-size: .95rem; }

/* ---------- calculator ---------- */
.calc-head { margin-bottom: 18px; }
.calc-head p.lead { color: var(--ink-2); font-size: 1.08rem; max-width: 70ch; }
.calc-layout { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 18px; align-items: start; }
@media (max-width: 860px) { .calc-layout { grid-template-columns: 1fr; } }
.calc-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.calc-card h2 { margin: 0 0 14px; font-size: 1.1rem; }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 14px; }
@media (max-width: 520px) { .fields { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.field.wide { grid-column: 1 / -1; }
.field[hidden] { display: none; }
.field label { font-weight: 650; font-size: .93rem; }
.ctl { display: flex; align-items: stretch; border: 1px solid var(--line); border-radius: var(--radius-s); background: var(--surface); overflow: hidden; }
.ctl:focus-within { border-color: var(--focus); box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent); }
.ctl input, .ctl select, .ctl textarea { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--ink); font: inherit; padding: 10px 12px; font-variant-numeric: tabular-nums; }
.ctl input:focus, .ctl select:focus, .ctl textarea:focus { outline: none; }
.ctl textarea { min-height: 170px; resize: vertical; font-family: var(--mono); font-size: .92rem; line-height: 1.5; }
.ctl .unit { display: flex; align-items: center; padding: 0 12px; background: var(--surface-2); color: var(--ink-2); font-size: .88rem; font-weight: 600; white-space: nowrap; border-left: 1px solid var(--line); }
.ctl input[aria-invalid="true"] { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.field .help { font-size: .82rem; color: var(--ink-3); margin: 0; line-height: 1.45; }
.calc-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.btn { font: inherit; font-weight: 650; font-size: .92rem; padding: 9px 15px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; }
.btn:hover { border-color: var(--ink-3); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.05); }

.results { background: var(--res-bg); color: var(--res-ink); border-radius: var(--radius); padding: 20px; position: sticky; top: 80px; min-height: 160px; }
@media (max-width: 860px) { .results { position: static; } }
.results h2 { color: var(--res-muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 12px; font-weight: 700; }
.res-primary { display: grid; gap: 12px; margin-bottom: 14px; }
.res-big { display: flex; flex-direction: column; padding-bottom: 12px; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.res-label { color: var(--res-muted); font-size: .9rem; }
.res-value { font-size: clamp(1.8rem, 1.4rem + 1.6vw, 2.5rem); font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; color: var(--res-accent); line-height: 1.15; }
.res-value small { font-size: .5em; font-weight: 650; color: var(--res-ink); letter-spacing: 0; }
.res-list { margin: 0; display: grid; gap: 0; }
.res-list div { display: flex; justify-content: space-between; gap: 14px; padding: 8px 0; border-bottom: 1px dashed rgba(255, 255, 255, .14); }
.res-list dt { color: var(--res-muted); font-size: .93rem; }
.res-list dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; }
.res-block h3 { color: var(--res-muted); font-size: .85rem; margin: 14px 0 6px; text-transform: uppercase; letter-spacing: .08em; }
.res-items { margin: 0; padding-left: 18px; font-family: var(--mono); font-size: .9rem; }
.res-warn { background: var(--warn-bg); color: var(--warn-ink); border-radius: 8px; padding: 9px 11px; font-size: .9rem; margin: 12px 0 0; display: flex; gap: 8px; }
.res-warn span { font-weight: 900; }
.res-note { color: var(--res-muted); font-size: .86rem; margin: 12px 0 0; }
.res-empty { color: var(--res-muted); }
.res-actions { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }
.res-actions .btn { background: transparent; color: var(--res-ink); border-color: rgba(255, 255, 255, .25); }
.res-actions .btn:hover { border-color: var(--res-ink); }

/* ---------- article ---------- */
.content { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 40px; margin-top: 18px; }
@media (max-width: 960px) { .content { grid-template-columns: 1fr; } }
.prose { max-width: 72ch; }
.prose li { margin-bottom: .35em; }
.formula { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: var(--radius-s); padding: 14px 16px; font-family: var(--mono); font-size: .92rem; line-height: 1.75; overflow-x: auto; white-space: pre-wrap; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; background: var(--surface); border-radius: var(--radius-s); overflow: hidden; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--surface-2); font-weight: 700; }
td.num { font-variant-numeric: tabular-nums; text-align: right; white-space: nowrap; }
details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); padding: 0 16px; margin-bottom: 8px; }
details summary { cursor: pointer; font-weight: 650; padding: 13px 0; list-style-position: outside; }
details[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 10px; }
.callout { background: var(--accent-soft); border-radius: var(--radius-s); padding: 13px 15px; font-size: .95rem; }
.sources { font-size: .92rem; }
.meta-line { font-size: .86rem; color: var(--ink-3); }
aside.side { display: flex; flex-direction: column; gap: 16px; }
.side-box { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.side-box h2 { font-size: 1rem; margin: 0 0 10px; }
.side-box ul { list-style: none; padding: 0; margin: 0; }
.side-box li a { display: block; padding: 7px 0; text-decoration: none; border-bottom: 1px solid var(--line); font-size: .95rem; }
.side-box li:last-child a { border-bottom: 0; }
.disclaimer-box { font-size: .86rem; color: var(--ink-2); }

/* ---------- static pages ---------- */
.page { padding-bottom: 40px; }
.page .prose h2 { margin-top: 1.8rem; }

/* ---------- footer ---------- */
.site-footer { margin-top: 56px; background: var(--ink); color: #d7d9df; padding: 44px 0 28px; }
@media (prefers-color-scheme: dark) { .site-footer { background: #0b0c0f; } }
.site-footer a { color: #f1efe9; text-decoration: none; }
.site-footer a:hover { color: var(--res-accent); text-decoration: underline; }
.ftr-grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 28px; }
@media (max-width: 960px) { .ftr-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .ftr-grid { grid-template-columns: 1fr; } }
.ftr-grid h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; color: #9fa3ae; margin: 0 0 12px; }
.ftr-grid ul { list-style: none; padding: 0; margin: 0; }
.ftr-grid li { margin-bottom: 7px; font-size: .93rem; }
.ftr-brand p { color: #b4b7c0; font-size: .93rem; max-width: 34ch; margin-top: 10px; }
.ftr-brand .brand { color: #fff; }
.ftr-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 34px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .12); font-size: .86rem; color: #9fa3ae; }
.ftr-bottom ul { display: flex; flex-wrap: wrap; gap: 6px 16px; list-style: none; margin: 0; padding: 0; }

/* ---------- result actions, sharing, working ---------- */
.res-actions { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 18px; }
.res-actions .btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 8px; font-size: .88rem; transition: background .15s, border-color .15s; }
.res-actions .btn svg { width: 17px; height: 17px; flex: none; }
.res-actions .btn-share { background: var(--res-accent); border-color: var(--res-accent); color: #1a1d24; }
.res-actions .btn-share:hover { filter: brightness(1.06); border-color: var(--res-accent); }
.share-menu { position: absolute; left: 0; bottom: calc(100% + 8px); z-index: 15; min-width: 250px; background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 10px 40px rgba(0, 0, 0, .25); padding: 6px; display: grid; animation: pop .14s ease-out; }
.share-menu[hidden] { display: none; }
.share-menu a, .share-menu button { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 8px; text-decoration: none; font: inherit; font-size: .93rem; font-weight: 600; color: var(--ink); background: none; border: 0; cursor: pointer; text-align: left; }
.share-menu a:hover, .share-menu button:hover { background: var(--surface-2); color: var(--ink); }
.share-menu svg { width: 18px; height: 18px; color: var(--accent); }
@keyframes pop { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
#results.flash .res-value { animation: flash .45s ease-out; }
@keyframes flash { from { opacity: .35; transform: translateY(2px); } to { opacity: 1; transform: none; } }
.res-steps { background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12); color: var(--res-ink); border-radius: 10px; padding: 0 14px; margin-top: 14px; }
.res-steps summary { padding: 11px 0; font-weight: 650; color: var(--res-accent); }
.res-steps[open] summary { border-bottom: 1px solid rgba(255, 255, 255, .12); margin-bottom: 8px; }
.res-steps ol { margin: 0 0 12px; padding-left: 20px; font-family: var(--mono); font-size: .85rem; line-height: 1.65; color: #e7e5df; }
.res-steps li + li { margin-top: 4px; }
.mbar { display: none; }
@media (max-width: 860px) {
  .mbar { position: fixed; left: 10px; right: 10px; bottom: 10px; z-index: 25; display: flex; align-items: center; justify-content: space-between; gap: 10px; background: var(--res-bg); color: var(--res-ink); border-radius: 14px; padding: 10px 10px 10px 16px; box-shadow: 0 8px 30px rgba(0, 0, 0, .3); font-size: .92rem; font-weight: 650; animation: pop .18s ease-out; }
  .mbar[hidden] { display: none; }
  .mbar .mbar-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .mbar button { flex: none; font: inherit; font-size: .85rem; font-weight: 700; padding: 8px 12px; border-radius: 9px; border: 0; background: var(--res-accent); color: #1a1d24; cursor: pointer; }
}
@media (max-width: 420px) { .res-actions { grid-template-columns: repeat(2, 1fr); } }
.btn, .tool-grid a, .cat-card, .chips button, input, select { transition: border-color .15s, background-color .15s, box-shadow .15s, transform .15s; }

/* ---------- reference tables & mistakes ---------- */
.ref caption { caption-side: top; text-align: left; font-weight: 650; padding: 0 0 8px; color: var(--ink-2); font-size: .92rem; }
.mistakes li::marker { color: var(--accent); }

/* ---------- blog ---------- */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; list-style: none; padding: 0; margin: 0; }
.post-card { display: flex; flex-direction: column; height: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; box-shadow: var(--shadow); }
.post-card:hover { color: inherit; transform: translateY(-3px); }
.post-cover { position: relative; aspect-ratio: 16 / 7; background: var(--cat, var(--accent)); color: #fff; display: flex; align-items: flex-end; padding: 16px 18px; overflow: hidden; }
.post-cover::before { content: ""; position: absolute; inset: 0; background-image: repeating-linear-gradient(0deg, transparent 0 23px, rgba(255, 255, 255, .13) 23px 24px), repeating-linear-gradient(90deg, transparent 0 23px, rgba(255, 255, 255, .13) 23px 24px); }
.post-cover svg { position: absolute; right: 16px; top: 14px; width: 44px; height: 44px; opacity: .9; }
.post-cover span { position: relative; font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; background: rgba(0, 0, 0, .22); padding: 4px 9px; border-radius: 999px; }
.post-body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.post-body h3 { margin: 0; font-size: 1.15rem; line-height: 1.3; }
.post-body p { margin: 0; color: var(--ink-2); font-size: .94rem; }
.post-meta { margin-top: auto; padding-top: 6px; font-size: .84rem; color: var(--ink-3); display: flex; gap: 14px; }
.article-hero { padding: 10px 0 24px; border-bottom: 1px solid var(--line); margin-bottom: 26px; }
.article-hero .kicker { display: inline-block; font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--cat, var(--accent)); margin-bottom: 10px; }
.article-hero p.lead { font-size: 1.15rem; color: var(--ink-2); max-width: 66ch; }
.byline { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: .9rem; color: var(--ink-3); }
.article { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 48px; }
@media (max-width: 960px) { .article { grid-template-columns: 1fr; } }
.article .prose { font-size: 1.06rem; line-height: 1.75; }
.article .prose h2 { margin-top: 2.2rem; scroll-margin-top: 90px; }
.article .prose h3 { margin-top: 1.6rem; }
.article .prose img, .article .prose figure { margin: 1.5rem 0; }
.article .prose figure svg { width: 100%; height: auto; display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); }
.article .prose figcaption { font-size: .88rem; color: var(--ink-3); margin-top: 8px; }
.toc { position: sticky; top: 84px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; font-size: .92rem; }
@media (max-width: 960px) { .toc { position: static; order: -1; } }
.toc h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); margin: 0 0 10px; }
.toc ol { margin: 0; padding-left: 18px; }
.toc li { margin-bottom: 6px; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a:hover { color: var(--accent); }
.calc-cta { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; background: var(--res-bg); color: var(--res-ink); border-radius: var(--radius); padding: 18px 20px; margin: 1.8rem 0; }
.calc-cta strong { display: block; font-family: var(--display); font-size: 1.1rem; }
.calc-cta span { color: var(--res-muted); font-size: .93rem; }
.calc-cta a { flex: none; text-decoration: none; font-weight: 700; background: var(--res-accent); color: #1a1d24; padding: 10px 16px; border-radius: 10px; }
.calc-cta a:hover { color: #1a1d24; filter: brightness(1.06); }
.keypoints { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--c-garden); border-radius: var(--radius-s); padding: 14px 18px; }
.keypoints h2 { margin: 0 0 8px !important; font-size: 1.05rem; }
.keypoints ul { margin: 0; padding-left: 20px; }

@media print {
  .res-actions, .mbar, .share-menu, .res-steps summary { display: none !important; }
  .res-steps { border: 0; } .res-steps ol { color: #000; }
  details.res-steps:not([open]) > *:not(summary) { display: block; }
  .site-header, .site-footer, .calc-actions, .res-actions, aside.side { display: none !important; }
  .results { background: #fff; color: #000; border: 1px solid #000; }
  .res-value { color: #000; }
}

/* ---------- home calculator ---------- */
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 430px); gap: 40px; align-items: center; }
.hero-install { margin-top: 18px; }
.install-btn { display: inline-flex; align-items: center; gap: 8px; font: inherit; font-weight: 650; font-size: .92rem; padding: 9px 15px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; }
.install-btn svg { width: 17px; height: 17px; }
.install-btn[hidden] { display: none; }
.home-calc { background: var(--res-bg); color: var(--res-ink); border-radius: 20px; padding: 16px; box-shadow: 0 12px 40px rgba(26, 29, 36, .25); outline: none; }
.home-calc:focus-visible { box-shadow: 0 0 0 3px var(--focus), 0 12px 40px rgba(26, 29, 36, .25); }
.hc-top { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.hc-title { font-family: var(--display); font-weight: 700; font-size: 1rem; margin-right: auto; color: var(--res-muted); }
.hc-chip { font: inherit; font-size: .78rem; font-weight: 700; letter-spacing: .04em; padding: 5px 10px; border-radius: 999px; border: 1px solid rgba(255, 255, 255, .18); background: transparent; color: var(--res-ink); cursor: pointer; }
.hc-chip:hover { border-color: var(--res-accent); }
.hc-sci-toggle { display: none; }
.hc-display { background: rgba(255, 255, 255, .06); border-radius: 12px; padding: 12px 14px; text-align: right; min-height: 86px; display: flex; flex-direction: column; justify-content: flex-end; overflow: hidden; }
.hc-expr { font-family: var(--mono); font-size: 1rem; color: var(--res-muted); word-break: break-all; min-height: 1.4em; }
.hc-out { font-family: var(--display); font-weight: 700; font-size: 2.1rem; line-height: 1.15; word-break: break-all; font-variant-numeric: tabular-nums; }
.hc-out.err { font-size: 1.05rem; color: #ffb4a0; font-family: var(--font); padding-top: 6px; }
.hc-sci, .hc-main { display: grid; gap: 6px; margin-top: 8px; }
.hc-sci { grid-template-columns: repeat(5, 1fr); }
.hc-main { grid-template-columns: repeat(4, 1fr); }
.hc-sci button, .hc-main button { font: inherit; font-weight: 600; border: 0; border-radius: 10px; cursor: pointer; color: var(--res-ink); background: rgba(255, 255, 255, .09); padding: 0; min-height: 46px; font-size: 1.1rem; touch-action: manipulation; transition: background .1s; }
.home-calc .hc-sci button { min-height: 36px; font-weight: 500; font-size: .9rem; background: rgba(255, 255, 255, .05); color: var(--res-muted); }
.home-calc button.fn { background: rgba(255, 255, 255, .16); font-size: 1rem; }
.home-calc button.op { background: rgba(255, 138, 76, .2); color: var(--res-accent); font-size: 1.3rem; }
.home-calc button.eq { background: var(--res-accent); color: #1a1d24; font-size: 1.3rem; }
.hc-sci button:hover, .hc-main button:hover { background: rgba(255, 255, 255, .2); }
.home-calc .hc-main button.op:hover { background: rgba(255, 138, 76, .32); }
.home-calc .hc-main button.eq:hover { filter: brightness(1.08); background: var(--res-accent); }
.hc-sci button:active, .hc-main button:active { transform: scale(.97); }
.hc-hist { list-style: none; margin: 10px 0 0; padding: 0; font-family: var(--mono); font-size: .8rem; color: var(--res-muted); text-align: right; }
.hc-hist:empty { display: none; }
.hc-hist li { padding: 2px 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .home-calc { max-width: 460px; width: 100%; }
}
@media (max-width: 560px) {
  .hc-sci-toggle { display: inline-block; }
  .home-calc .hc-sci { display: none; }
  .home-calc.hc-sci-open .hc-sci { display: grid; }
  .hc-main button { min-height: 54px; }
  .hero { padding-top: 32px; }
  .hero .lead { font-size: 1.02rem; }
}

/* ---------- saved / recent ---------- */
.my-tools { padding-bottom: 0; }
.my-tools-grid { display: grid; gap: 22px; }
.link-btn { font: inherit; font-size: .88rem; background: none; border: 0; color: var(--ink-3); cursor: pointer; text-decoration: underline; }
.calc-title { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.fav-btn { flex: none; display: inline-flex; align-items: center; gap: 6px; font: inherit; font-weight: 650; font-size: .9rem; padding: 7px 13px; margin-top: 6px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.fav-btn[hidden] { display: none; }
.fav-btn .fav-star { font-size: 1.1rem; line-height: 1; color: var(--accent); }
.fav-btn[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--ink); }
.ftr-bottom .install-btn { margin-right: auto; }
@media print { .fav-btn, .install-btn { display: none !important; } }