:root {
  color-scheme: light;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --text: #172033;
  --muted: #64748b;
  --faint: #94a3b8;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #eff6ff;
  --success: #047857;
  --success-soft: #ecfdf5;
  --danger: #c2410c;
  --danger-soft: #fff7ed;
  --shadow: 0 14px 30px rgba(15, 23, 42, .06);
  --radius: 16px;
  --radius-sm: 12px;
  --content: 1180px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101827;
  --surface: #172033;
  --surface-subtle: #1d293b;
  --text: #f1f5f9;
  --muted: #a8b5c7;
  --faint: #7f8ba0;
  --border: #2b3950;
  --border-strong: #40516b;
  --primary: #60a5fa;
  --primary-dark: #93c5fd;
  --primary-soft: #192f55;
  --success: #5eead4;
  --success-soft: #123a38;
  --danger: #fdba74;
  --danger-soft: #442313;
  --shadow: 0 14px 30px rgba(0, 0, 0, .17);
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); line-height: 1.5; }
button, input, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 42%, transparent); outline-offset: 2px; }
a { color: inherit; text-decoration: none; }
.skip-link { position: fixed; z-index: 20; top: -60px; left: 16px; padding: 10px 14px; border-radius: 10px; color: #fff; background: var(--primary); }
.skip-link:focus { top: 16px; }
.no-js { max-width: 720px; margin: 64px auto; padding: 24px; }

.shell { min-height: 100vh; padding-bottom: 78px; }
.topbar { height: 68px; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; background: color-mix(in srgb, var(--bg) 93%, transparent); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(14px); }
.header-content, .page, .footer-content { width: min(var(--content), 100%); margin: auto; }
.header-content { display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; gap: 9px; align-items: center; font-weight: 780; letter-spacing: -.04em; font-size: 20px; }
.brand-mark { width: 31px; height: 31px; display: grid; place-items: center; border-radius: 9px; color: #fff; background: var(--primary); font-size: 18px; font-weight: 850; }
.desktop-nav { display: none; align-items: center; gap: 4px; }
.desktop-nav a, .desktop-nav button { border: 0; background: none; color: var(--muted); padding: 10px 12px; border-radius: 9px; font-size: 14px; font-weight: 650; }
.desktop-nav a:hover, .desktop-nav button:hover { background: var(--surface); color: var(--text); }
.theme-toggle, .icon-button { border: 1px solid var(--border); color: var(--muted); background: var(--surface); border-radius: 10px; width: 42px; height: 42px; display: inline-grid; place-items: center; font-size: 18px; }
.theme-toggle:hover, .icon-button:hover { border-color: var(--border-strong); color: var(--text); }

.page { padding: 28px 20px 44px; }
.eyebrow { margin: 0 0 10px; color: var(--primary); font-size: 11px; font-weight: 800; letter-spacing: .1em; }
.hero { padding: 25px 0 32px; }
.hero h1 { margin: 0; max-width: 650px; letter-spacing: -.057em; font-size: clamp(35px, 10vw, 64px); line-height: 1.02; }
.hero-copy { max-width: 550px; margin: 16px 0 0; color: var(--muted); font-size: 16px; }
.search-wrap { position: relative; margin-top: 25px; max-width: 760px; }
.search-box { min-height: 59px; display: flex; align-items: center; gap: 12px; padding: 0 16px; border: 1px solid var(--border-strong); box-shadow: var(--shadow); border-radius: 15px; background: var(--surface); transition: border-color .16s, box-shadow .16s; }
.search-box:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 14%, transparent), var(--shadow); }
.search-symbol { color: var(--primary); font-size: 20px; }
.search-box input { width: 100%; min-width: 0; border: 0; outline: 0; color: var(--text); background: transparent; font-size: 16px; }
.search-box input::placeholder { color: var(--faint); }
.search-results { position: absolute; top: calc(100% + 8px); z-index: 6; width: 100%; max-height: min(435px, 60vh); padding: 8px; overflow-y: auto; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); box-shadow: 0 20px 42px rgba(15, 23, 42, .16); }
.search-label { display: block; padding: 9px 10px 6px; color: var(--faint); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.search-result { width: 100%; display: grid; grid-template-columns: 40px 1fr auto; align-items: center; gap: 10px; padding: 11px 10px; border: 0; border-radius: 10px; text-align: left; color: var(--text); background: transparent; }
.search-result:hover, .search-result:focus-visible { background: var(--surface-subtle); }
.search-result-icon { width: 38px; height: 38px; display: grid; place-items: center; color: var(--primary); border-radius: 10px; background: var(--primary-soft); font-size: 17px; }
.search-result strong, .search-result small { display: block; }
.search-result strong { font-size: 14px; }
.search-result small { margin-top: 1px; color: var(--muted); font-size: 12px; }
.result-category { color: var(--faint); font-size: 11px; font-weight: 700; }
.search-empty { padding: 18px 12px; color: var(--muted); font-size: 14px; }
.suggestions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 13px; }
.suggestion { padding: 8px 10px; border: 1px solid var(--border); border-radius: 99px; color: var(--muted); background: var(--surface); font-size: 12px; }
.suggestion:hover { color: var(--primary); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }

.section { margin-top: 34px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.section-heading h2 { margin: 0; letter-spacing: -.03em; font-size: 20px; }
.section-heading p { margin: 0; color: var(--muted); font-size: 13px; }
.text-action { border: 0; padding: 5px 0; color: var(--primary); background: none; font-weight: 700; font-size: 13px; }
.popular-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.tool-card { min-height: 118px; display: flex; flex-direction: column; gap: 8px; padding: 15px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); transition: transform .16s, border-color .16s, box-shadow .16s; text-align: left; }
.tool-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--primary) 38%, var(--border)); box-shadow: var(--shadow); }
.tool-icon { width: 31px; height: 31px; display: grid; place-items: center; border-radius: 9px; color: var(--primary); background: var(--primary-soft); font-size: 16px; font-weight: 750; }
.tool-card strong { font-size: 14px; letter-spacing: -.01em; }
.tool-card small { display: -webkit-box; overflow: hidden; color: var(--muted); font-size: 12px; line-height: 1.3; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.categories-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.category-card { display: flex; align-items: center; gap: 11px; min-height: 63px; padding: 12px; border: 1px solid var(--border); border-radius: 13px; background: var(--surface); text-align: left; }
.category-card:hover { border-color: color-mix(in srgb, var(--primary) 38%, var(--border)); }
.category-card span { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; color: var(--primary); background: var(--primary-soft); font-weight: 800; }
.category-card strong { display: block; font-size: 13px; }
.category-card small { display: block; margin-top: 1px; color: var(--muted); font-size: 11px; }
.quick-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.quick-tool { min-height: 93px; padding: 13px; border: 1px dashed var(--border-strong); border-radius: 14px; background: transparent; color: var(--text); text-align: left; }
.quick-tool:hover { background: var(--surface); border-style: solid; }
.quick-tool b, .quick-tool small { display: block; }
.quick-tool b { font-size: 13px; }
.quick-tool small { margin-top: 5px; color: var(--muted); font-size: 11px; }
.compact-list { display: grid; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.compact-row { width: 100%; display: flex; align-items: center; gap: 12px; min-height: 58px; padding: 9px 13px; border: 0; border-bottom: 1px solid var(--border); color: var(--text); background: transparent; text-align: left; }
.compact-row:last-child { border-bottom: 0; }
.compact-row:hover { background: var(--surface-subtle); }
.compact-row .row-icon { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; color: var(--primary); background: var(--primary-soft); }
.compact-row strong { font-size: 13px; }
.compact-row small { margin-left: auto; color: var(--faint); font-size: 11px; }
.empty-inline { padding: 17px; border: 1px dashed var(--border-strong); border-radius: var(--radius); color: var(--muted); font-size: 13px; }

.calculator-page { max-width: 1010px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; color: var(--muted); font-size: 13px; }
.breadcrumb a:hover { color: var(--primary); }
.crumb-divider { color: var(--faint); }
.calculator-top { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.calculator-top h1, .category-hero h1 { margin: 0; letter-spacing: -.045em; font-size: clamp(27px, 5vw, 40px); }
.calculator-top p, .category-hero p { max-width: 590px; margin: 8px 0 0; color: var(--muted); font-size: 15px; }
.favorite-button { width: 43px; height: 43px; flex: 0 0 auto; border: 1px solid var(--border); border-radius: 12px; color: var(--muted); background: var(--surface); font-size: 21px; }
.favorite-button.active { border-color: color-mix(in srgb, #f59e0b 50%, var(--border)); color: #d97706; background: #fffbeb; }
.calculator-card { display: grid; gap: 16px; padding: 16px; border: 1px solid var(--border); border-radius: 18px; background: var(--surface); box-shadow: var(--shadow); }
.input-panel { min-width: 0; }
.panel-label { margin: 0 0 14px; color: var(--faint); font-size: 11px; font-weight: 800; letter-spacing: .09em; }
.field-grid { display: grid; gap: 14px; }
.field { display: block; }
.field > span { display: block; margin: 0 0 7px; color: var(--text); font-size: 13px; font-weight: 700; }
.input-wrap { position: relative; display: flex; align-items: center; }
.input-prefix, .input-suffix { position: absolute; z-index: 1; color: var(--muted); font-size: 14px; font-weight: 650; pointer-events: none; }
.input-prefix { left: 14px; }.input-suffix { right: 14px; }
.input-wrap input, .select-input, textarea { width: 100%; height: 50px; padding: 0 13px; border: 1px solid var(--border-strong); border-radius: 12px; outline: 0; color: var(--text); background: var(--surface); font-size: 16px; transition: border-color .14s, box-shadow .14s; }
.field-wide { grid-column: 1 / -1; } textarea { min-height: 116px; padding: 12px 13px; resize: vertical; line-height: 1.45; }
.input-wrap.has-prefix input { padding-left: 33px; }.input-wrap.has-suffix input { padding-right: 33px; }
.input-wrap input:focus, .select-input:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 15%, transparent); }
input[type=number]::-webkit-inner-spin-button, input[type=number]::-webkit-outer-spin-button { margin: 0; }
.field-error { min-height: 17px; margin: 5px 2px 0; color: var(--danger); font-size: 12px; }
.primary-button, .secondary-button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 12px; padding: 0 16px; font-weight: 750; }
.primary-button { width: 100%; border: 1px solid var(--primary); color: white; background: var(--primary); }
.primary-button:hover { border-color: var(--primary-dark); background: var(--primary-dark); }.primary-button:active { transform: translateY(1px); }
.secondary-button { border: 1px solid var(--border-strong); color: var(--text); background: var(--surface); }.secondary-button:hover { border-color: var(--primary); color: var(--primary); }
.result-panel { min-height: 260px; padding: 18px; border-radius: 14px; background: var(--primary-soft); }
.result-panel.empty { display: grid; place-content: center; text-align: center; background: var(--surface-subtle); border: 1px dashed var(--border-strong); }
.empty-result-icon { margin-bottom: 8px; color: var(--primary); font-size: 24px; }.empty-result-text { max-width: 190px; color: var(--muted); font-size: 13px; }
.result-kicker { margin: 0; color: var(--primary); font-size: 11px; font-weight: 850; letter-spacing: .1em; }.result-title { margin: 12px 0 1px; color: var(--muted); font-size: 13px; font-weight: 650; }.primary-value { margin: 0; color: var(--text); font-size: clamp(30px, 7vw, 43px); font-weight: 820; letter-spacing: -.055em; line-height: 1.15; }.primary-detail { margin: 6px 0 0; color: var(--success); font-size: 13px; font-weight: 700; }
.result-breakdown { margin-top: 22px; border-top: 1px solid color-mix(in srgb, var(--primary) 17%, var(--border)); }.result-row { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid color-mix(in srgb, var(--primary) 12%, var(--border)); font-size: 13px; }.result-row span { color: var(--muted); }.result-row strong { text-align: right; }.result-row.total { border-bottom: 0; color: var(--text); font-size: 14px; font-weight: 800; }.result-row.total span { color: var(--text); }
.calculator-controls { display: grid; grid-template-columns: 92px 1fr; gap: 9px; margin-top: 16px; }.calculator-controls .primary-button { min-width: 0; }.reset-button { min-width: 0; padding: 0 10px; }
.result-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 14px; }.result-actions button { min-height: 39px; padding: 0 12px; border: 1px solid var(--border); border-radius: 10px; color: var(--muted); background: var(--surface); font-size: 13px; font-weight: 700; }.result-actions button:hover { border-color: var(--primary); color: var(--primary); }.download-wrap { position: relative; }.download-menu { position: absolute; z-index: 5; right: 0; bottom: calc(100% + 7px); min-width: 145px; padding: 5px; border: 1px solid var(--border); border-radius: 11px; background: var(--surface); box-shadow: var(--shadow); }.download-menu button { width: 100%; display: block; border: 0; text-align: left; }.download-menu button:hover { background: var(--surface-subtle); }
.calculator-info { display: grid; gap: 16px; margin-top: 22px; }.info-card { padding: 18px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }.info-card h2 { margin: 0 0 8px; font-size: 17px; letter-spacing: -.02em; }.info-card p, .info-card li { color: var(--muted); font-size: 13px; }.info-card p { margin: 0; }.info-card ul { margin: 8px 0 0; padding-left: 18px; }.related-list { display: flex; flex-wrap: wrap; gap: 8px; }.related-list button { border: 1px solid var(--border); border-radius: 99px; padding: 8px 10px; color: var(--text); background: var(--surface-subtle); font-size: 12px; }.related-list button:hover { color: var(--primary); border-color: var(--primary); }

.person-list, .appliance-list { display: grid; gap: 9px; margin-bottom: 12px; }.person-row, .appliance-row { display: grid; grid-template-columns: 1fr 1fr auto; gap: 8px; }.appliance-row { grid-template-columns: 1fr 74px 74px 64px auto; }.person-row input, .appliance-row input { min-width: 0; height: 43px; border: 1px solid var(--border-strong); border-radius: 10px; padding: 0 10px; color: var(--text); background: var(--surface); font-size: 13px; }.remove-row { width: 38px; height: 43px; border: 1px solid var(--border); border-radius: 10px; color: var(--muted); background: var(--surface); }.remove-row:hover { color: var(--danger); border-color: var(--danger); }.add-row { min-height: 40px; border: 1px dashed var(--border-strong); border-radius: 10px; color: var(--primary); background: transparent; font-size: 13px; font-weight: 750; }
.converter-pair { display: grid; grid-template-columns: 1fr; gap: 12px; }.converter-swap { width: 42px; height: 42px; justify-self: center; border: 1px solid var(--border); border-radius: 50%; color: var(--primary); background: var(--surface); font-size: 18px; }
.category-hero { margin: 5px 0 26px; }.category-tools { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }

.footer { border-top: 1px solid var(--border); background: var(--surface); }.footer-content { padding: 28px 20px 96px; }.footer-top { display: flex; flex-direction: column; gap: 18px; }.footer-links { display: flex; flex-wrap: wrap; gap: 14px; color: var(--muted); font-size: 13px; }.footer-links a:hover { color: var(--primary); }.footer-note { margin: 18px 0 0; color: var(--faint); font-size: 11px; line-height: 1.55; }
.bottom-nav { position: fixed; z-index: 9; bottom: 0; left: 0; right: 0; display: grid; grid-template-columns: repeat(5, 1fr); height: 66px; padding: 5px max(8px, env(safe-area-inset-right)) calc(5px + env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left)); border-top: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(14px); }.bottom-nav button { display: grid; place-items: center; gap: 1px; border: 0; color: var(--faint); background: transparent; font-size: 10px; }.bottom-nav button span:first-child { font-size: 18px; }.bottom-nav button.active, .bottom-nav button:hover { color: var(--primary); }
.toast { position: fixed; z-index: 20; left: 50%; bottom: 82px; max-width: calc(100% - 36px); transform: translate(-50%, 18px); padding: 10px 14px; border-radius: 10px; color: #fff; background: #172033; box-shadow: 0 14px 28px rgba(15, 23, 42, .2); font-size: 13px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; }.toast.visible { opacity: 1; transform: translate(-50%, 0); }

@media (min-width: 640px) { .page { padding: 38px 32px 55px; }.popular-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }.categories-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }.quick-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }.field-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }.calculator-card { padding: 22px; }.person-row { grid-template-columns: 1fr 1fr auto; }.converter-pair { grid-template-columns: 1fr auto 1fr; align-items: end; }.converter-swap { margin-bottom: 4px; }.category-tools { grid-template-columns: repeat(3, minmax(0, 1fr)); }.footer-content { padding-left: 32px; padding-right: 32px; } }
@media (min-width: 900px) { .shell { padding-bottom: 0; }.topbar { padding: 0 32px; }.desktop-nav { display: flex; }.bottom-nav { display: none; }.page { padding: 55px 32px 64px; }.hero { padding-top: 36px; }.popular-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }.tool-card { min-height: 128px; }.categories-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }.category-card { min-height: 75px; }.calculator-card { grid-template-columns: minmax(0, 1fr) minmax(320px, .9fr); align-items: stretch; gap: 24px; padding: 25px; }.result-panel { min-height: 100%; }.calculator-info { grid-template-columns: 1.5fr 1fr; }.calculator-info .info-card:first-child { grid-row: span 2; }.category-tools { grid-template-columns: repeat(4, minmax(0, 1fr)); }.footer-content { padding-bottom: 36px; }.footer-top { flex-direction: row; justify-content: space-between; align-items: center; }.toast { bottom: 28px; } }
@media (max-width: 430px) { .appliance-row { grid-template-columns: 1fr 60px 60px 54px auto; gap: 5px; }.appliance-row input { padding: 0 6px; font-size: 12px; }.person-row { gap: 5px; }.person-row input { padding: 0 8px; }.page { padding-left: 16px; padding-right: 16px; }.topbar { padding-left: 16px; padding-right: 16px; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; } }
@media print { :root { color-scheme: light; } body { background: #fff; color: #111827; } .topbar, .footer, .bottom-nav, .breadcrumb, .favorite-button, .calculator-info, .calculator-controls, .result-actions, .toast { display: none !important; } .shell { padding: 0; }.page { max-width: none; padding: 0; }.calculator-top { margin: 0 0 18px; }.calculator-card { display: block; padding: 0; border: 0; box-shadow: none; }.input-panel { margin-bottom: 20px; }.result-panel { min-height: auto; border: 1px solid #cbd5e1; background: #eff6ff; }.input-wrap input, .select-input, textarea { border: 1px solid #cbd5e1; color: #111827; background: #fff; }.field-error { display: none; } }