/* ===== Interior Calculators — design system ===== */
:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #1c2330;
  --border: #2a3340;
  --text: #e6edf3;
  --text-muted: #9aa7b4;
  --primary: #4caf7d;
  --primary-hover: #5dc48e;
  --primary-contrast: #ffffff;
  --accent: #f6a623;
  --danger: #f87171;
  --warn: #fbbf24;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef2f7;
  --border: #dbe2ea;
  --text: #0f1722;
  --text-muted: #5a6677;
  --primary: #2a8a55;
  --primary-hover: #1d7244;
  --shadow: 0 10px 30px rgba(20,60,40,.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; font-size: 16px; -webkit-font-smoothing: antialiased; }
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 18px; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3 { line-height: 1.2; font-weight: 750; letter-spacing: -.02em; }
h1 { font-size: clamp(1.7rem,4vw,2.5rem); margin: 0 0 .4em; }
h2 { font-size: clamp(1.3rem,2.6vw,1.7rem); }
.muted { color: var(--text-muted); }
.small { font-size: .875rem; }
.lead { font-size: 1.075rem; color: var(--text-muted); }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--primary); color: #fff; padding: 10px 16px; z-index: 100; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }
/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: saturate(180%) blur(12px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 18px; height: 62px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark { font-size: 1.35rem; filter: drop-shadow(0 0 8px var(--primary)); }
.brand-text em { font-style: normal; color: var(--primary); }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-list { display: none; list-style: none; margin: 0; padding: 0; gap: 18px; }
.nav-list a { color: var(--text-muted); font-weight: 600; font-size: .92rem; }
.nav-list a:hover { color: var(--text); text-decoration: none; }
.nav-toggle { display: flex; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; }
.theme-toggle { background: var(--bg-elev); border: 1px solid var(--border); color: var(--text); border-radius: 999px; width: 40px; height: 40px; cursor: pointer; display: grid; place-items: center; font-size: 1.05rem; }
.theme-toggle:hover { border-color: var(--primary); }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: none; }
@media (min-width: 760px) { .nav-list { display: flex; } .nav-toggle { display: none; } }
.nav-list.open { display: flex; flex-direction: column; position: absolute; top: 62px; left: 0; right: 0; background: var(--bg-elev); border-bottom: 1px solid var(--border); padding: 12px 18px; z-index: 49; }
/* Hero */
.hero { padding: 56px 0 26px; text-align: center; }
.hero p.lead { max-width: 620px; margin: 0 auto; }
.search-wrap { max-width: 520px; margin: 26px auto 0; }
.search-wrap input { width: 100%; padding: 14px 18px; font-size: 1rem; border-radius: 999px; border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); }
.search-wrap input:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
/* Cards */
.section { padding: 30px 0; }
.section h2 { margin: 0 0 4px; }
.section-sub { color: var(--text-muted); margin: 0 0 18px; }
.card-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 560px) { .card-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 880px) { .card-grid { grid-template-columns: 1fr 1fr 1fr; } }
.tool-card { display: flex; align-items: flex-start; gap: 14px; padding: 16px 18px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); transition: transform .12s ease, border-color .12s ease, box-shadow .12s ease; }
.tool-card:hover { transform: translateY(-2px); border-color: var(--primary); box-shadow: var(--shadow); text-decoration: none; }
.tool-card-icon { flex: 0 0 auto; display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border-radius: 10px; color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); border: 1px solid color-mix(in srgb, var(--primary) 24%, transparent); transition: border-color .12s ease; }
.tool-card-icon svg { width: 24px; height: 24px; }
.tool-card-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.tool-card-title { font-weight: 700; }
.tool-card-cat { font-size: .8rem; color: var(--text-muted); }
/* Tool head */
.tool-head h1 { display: flex; align-items: center; gap: 12px; }
.tool-head-icon { flex: 0 0 auto; display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; border-radius: 12px; color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); border: 1px solid color-mix(in srgb, var(--primary) 24%, transparent); }
.tool-head-icon svg { width: 28px; height: 28px; }
.cat-pill { display: inline-block; font-size: .78rem; font-weight: 700; color: var(--primary); background: color-mix(in srgb, var(--primary) 14%, transparent); padding: 3px 10px; border-radius: 999px; margin-bottom: 10px; }
/* Tool page */
.tool-page { padding: 26px 18px 60px; max-width: 760px; }
.breadcrumb { font-size: .85rem; color: var(--text-muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--text-muted); }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; font-weight: 700; color: var(--primary); margin: 0 0 6px; }
.tool-head { margin-bottom: 24px; }
/* Widget */
.tool-widget { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.field { margin-bottom: 16px; }
.field > label { display: block; font-weight: 650; margin-bottom: 7px; font-size: .95rem; }
.field .hint { font-weight: 400; color: var(--text-muted); font-size: .85rem; }
.input, select, .tool-widget input[type="number"], .tool-widget input[type="text"] { width: 100%; padding: 12px 14px; font-size: 1rem; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.input:focus, select:focus, .tool-widget input:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
.input-row { display: flex; gap: 10px; }
.input-row > * { flex: 1; }
.inline-unit { display: flex; gap: 8px; }
.inline-unit input { flex: 2; }
.inline-unit select { flex: 1; min-width: 96px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 520px) { .grid-2 { grid-template-columns: 1fr; } }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: var(--primary); color: var(--primary-contrast); border: 0; cursor: pointer; padding: 12px 20px; font-size: 1rem; font-weight: 700; border-radius: var(--radius-sm); }
.btn:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--border); }
.btn-ghost:hover { background: color-mix(in srgb, var(--primary) 12%, transparent); border-color: var(--primary); color: var(--primary); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.unit-toggle { display: flex; gap: 0; margin-bottom: 18px; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; width: fit-content; }
.unit-toggle button { background: transparent; border: 0; color: var(--text-muted); padding: 8px 16px; cursor: pointer; font-size: .9rem; font-weight: 600; }
.unit-toggle button.active { background: var(--primary); color: #fff; }
/* Results */
.result { margin-top: 20px; border-top: 1px dashed var(--border); padding-top: 18px; }
.result-primary { background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 18%, transparent), transparent); border: 1px solid color-mix(in srgb, var(--primary) 35%, var(--border)); border-radius: var(--radius-sm); padding: 16px 18px; margin-bottom: 14px; }
.result-primary .r-label { font-size: .8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; }
.result-primary .r-value { font-size: clamp(1.8rem,6vw,2.6rem); font-weight: 800; font-variant-numeric: tabular-nums; color: var(--text); line-height: 1.1; }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .result-grid { grid-template-columns: 1fr; } }
.stat { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; }
.stat .s-label { font-size: .78rem; color: var(--text-muted); }
.stat .s-value { font-size: 1.25rem; font-weight: 750; font-variant-numeric: tabular-nums; }
.notice { color: var(--warn); font-size: .9rem; margin-top: 10px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; }
.pill { background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; cursor: pointer; font-size: .85rem; color: var(--text); }
.pill[aria-pressed="true"],.pill.active { border-color: var(--primary); color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); }
/* Result toolbar */
.result-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.act-btn { padding: 9px 14px; font-size: .9rem; }
.act-btn .act-ic { font-size: 1rem; line-height: 1; }
/* History */
.calc-history { margin-top: 18px; border-top: 1px dashed var(--border); padding-top: 14px; }
.calc-history-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 10px; }
.calc-history-head h3 { font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; color: var(--text-muted); margin: 0; font-weight: 700; }
.hist-clear { background: none; border: 0; color: var(--text-muted); cursor: pointer; font-size: .8rem; text-decoration: underline; padding: 0; }
.hist-clear:hover { color: var(--danger); }
.hist-empty { color: var(--text-muted); font-size: .85rem; margin: 0; }
.hist-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.hist-item { display: flex; gap: 10px; align-items: flex-start; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; }
.hist-main { flex: 1; min-width: 0; }
.hist-val { font-weight: 750; font-variant-numeric: tabular-nums; word-break: break-word; }
.hist-label { color: var(--text-muted); font-size: .85rem; }
.hist-meta { color: var(--text-muted); font-size: .75rem; margin-top: 3px; word-break: break-word; }
.hist-actions { display: flex; gap: 6px; flex-shrink: 0; }
.hist-actions button { background: none; border: 1px solid var(--border); border-radius: 7px; color: var(--text-muted); cursor: pointer; padding: 4px 9px; font-size: .75rem; }
.hist-actions button:hover { border-color: var(--primary); color: var(--primary); }
/* Tool content */
.tool-content { margin-top: 44px; }
.tool-content h2 { margin: 0 0 12px; scroll-margin-top: 84px; }
.tool-content p { margin: 0 0 14px; }
.tool-content ul,.tool-content ol { margin: 0 0 16px; padding-left: 22px; }
.tool-content li { margin: 6px 0; }
.tool-content a { text-decoration: underline; text-underline-offset: 2px; }
.tool-content table { width: 100%; border-collapse: collapse; margin: 0 0 16px; }
.tool-content th,.tool-content td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); font-size: .92rem; }
.tool-content th { background: var(--bg-elev-2); font-weight: 700; }
.table-wrap { overflow-x: auto; margin: 0 0 16px; }
.formula-box { font-family: var(--mono); font-size: .98rem; background: var(--bg-elev-2); border: 1px solid var(--border); border-left: 3px solid var(--primary); border-radius: var(--radius-sm); padding: 12px 14px; margin: 0 0 14px; overflow-x: auto; }
.tool-diagram { margin: 20px 0; text-align: center; }
.tool-diagram svg { max-width: 100%; height: auto; }
/* FAQ */
.faq { margin-top: 40px; }
.faq h2 { margin-bottom: 16px; }
.faq details { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0 16px; margin-bottom: 10px; background: var(--bg-elev); }
.faq summary { cursor: pointer; font-weight: 650; padding: 14px 0; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; float: right; color: var(--text-muted); }
.faq details[open] summary::after { content: "－"; }
.faq .faq-a { padding-bottom: 14px; color: var(--text-muted); }
.related { margin-top: 44px; }
/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 50px; padding: 36px 0 28px; background: var(--bg-elev); }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 640px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 860px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer-brand p { font-size: .9rem; color: var(--text-muted); margin: 6px 0 0; }
.footer-col h2 { font-size: .95rem; margin: 0 0 10px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 6px; }
.footer-col a { color: var(--text-muted); font-size: .88rem; }
.footer-col a:hover { color: var(--primary); text-decoration: none; }
.footer-base { margin-top: 26px; font-size: .85rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 18px; }
/* Prose */
.prose-page { padding: 40px 0 60px; }
.prose-page h2 { margin: 30px 0 10px; }
.prose-page p { margin: 0 0 14px; }
.prose-page ul { margin: 0 0 16px; padding-left: 22px; }
.prose-page li { margin: 4px 0; }
.narrow { max-width: 680px; }
/* Consent */
.consent[hidden] { display: none; }
.consent { position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 80; max-width: var(--maxw); margin-inline: auto; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px 18px; }
.consent-msg { margin: 0; flex: 1; min-width: 240px; font-size: .9rem; color: var(--text-muted); }
.consent-msg a { color: var(--primary); }
.consent-actions { display: flex; gap: 10px; flex-shrink: 0; }
.consent-actions .btn { padding: 10px 18px; font-size: .9rem; }
@media (max-width: 520px) { .consent-actions { width: 100%; } .consent-actions .btn { flex: 1; } }
/* Utils */
.hidden { display: none !important; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
/* Language switcher — compact dropdown so 10 locales never overflow */
.lang-switcher { display: flex; align-items: center; }
.lang-dd { position: relative; }
.lang-dd summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 5px; font-size: .8rem; font-weight: 700; color: var(--text-muted); padding: 5px 9px; border-radius: 7px; border: 1px solid var(--border); white-space: nowrap; }
.lang-dd summary::-webkit-details-marker { display: none; }
.lang-dd summary::marker { content: ""; }
.lang-dd summary:hover { color: var(--primary); border-color: var(--primary); }
.lang-dd[open] summary { color: var(--primary); border-color: var(--primary); }
.lang-menu { position: absolute; right: 0; top: calc(100% + 6px); min-width: 160px; max-height: 320px; overflow-y: auto; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,.18); padding: 6px; z-index: 60; display: flex; flex-direction: column; gap: 2px; }
.lang-menu a { font-size: .88rem; font-weight: 600; color: var(--text-muted); padding: 7px 10px; border-radius: 6px; white-space: nowrap; }
.lang-menu a:hover { color: var(--primary); background: color-mix(in srgb, var(--primary) 10%, transparent); text-decoration: none; }
.lang-menu a[aria-current="true"] { color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); }
/* On mobile the nav becomes a vertical dropdown panel; let the language menu
   sit inline within it rather than absolutely (avoids spilling off-screen). */
@media (max-width: 759px) {
  .nav-list.open .lang-switcher { width: 100%; }
  .nav-list.open .lang-dd { width: 100%; }
  .nav-list.open .lang-menu { position: static; right: auto; box-shadow: none; min-width: 0; max-height: none; flex-flow: row wrap; }
}


/* Mobile: wide content tables scroll within their box instead of the page */
@media (max-width: 600px) {
  .tool-content table { display: block; max-width: 100%; overflow-x: auto; }
}