:root {
  --bg: #f5f7fb; --panel: #fff; --text: #172033; --muted: #667085;
  --line: #d8dee9; --brand: #0f766e; --brand-strong: #0b625c;
  --soft: #eef7f5; --shadow: 0 12px 30px rgba(16,24,40,.08);
}
html[data-theme="dark"] {
  --bg: #0b1220; --panel: #101a2b; --text: #e8eef7; --muted: #9fb0c7;
  --line: #28374d; --brand: #5eead4; --brand-strong: #99f6e4;
  --soft: #152238; --shadow: 0 14px 34px rgba(0,0,0,.2);
}
body { background: var(--bg); color: var(--text); }
.calculators { padding: clamp(2.5rem, 6vw, 5rem) 0; }
.calc-intro { max-width: 760px; }
.calculators h1 { margin: .2rem 0 .8rem; font-size: clamp(2.5rem, 7vw, 5rem); letter-spacing: -.06em; }
.lede { max-width: 680px; color: var(--muted); line-height: 1.6; }
.calc-tabs { display: flex; gap: .55rem; flex-wrap: wrap; margin: 2rem 0 1.2rem; padding: .35rem; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.calc-tabs button { border: 0; border-radius: 10px; padding: .75rem 1rem; color: var(--muted); background: transparent; font: inherit; font-size: .84rem; font-weight: 800; cursor: pointer; }
.calc-tabs button:hover, .calc-tabs button.is-active { color: #fff; background: var(--brand); }
.calc-panel { display: none; }
.calc-panel.is-active { display: block; }
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.panel { padding: 1.5rem; background: var(--panel); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.panel--narrow { max-width: 820px; }
.panel-heading { display: flex; align-items: flex-start; gap: .85rem; margin-bottom: 1rem; }
.panel-heading h2 { margin: 0 0 .25rem; font-size: 1.15rem; }
.panel-heading p { margin: 0; color: var(--muted); font-size: .85rem; line-height: 1.45; }
.panel-icon { display: grid; place-items: center; width: 36px; height: 36px; flex: 0 0 auto; border-radius: 11px; color: var(--brand-strong); background: var(--soft); font-size: 1.25rem; font-weight: 900; }
.panel label { display: grid; gap: .4rem; margin: 1rem 0; color: var(--muted); font-size: .82rem; font-weight: 800; }
.panel input { box-sizing: border-box; width: 100%; min-height: 46px; padding: .7rem .75rem; color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 10px; font: inherit; }
.panel input:focus { outline: 3px solid color-mix(in srgb, var(--brand) 20%, transparent); border-color: var(--brand); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1rem; }
.result { display: grid; gap: .4rem; margin-top: 1.4rem; padding: 1rem; background: var(--soft); border-radius: 12px; color: var(--text); line-height: 1.5; }
.result strong { font-size: 1.65rem; letter-spacing: -.03em; color: var(--brand-strong); }
.result small { color: var(--muted); }
.calc-note { display: flex; gap: .6rem; align-items: center; margin-top: 1rem; padding: .85rem 1rem; color: var(--muted); background: color-mix(in srgb, var(--soft) 55%, var(--panel)); border: 1px solid var(--line); border-radius: 12px; font-size: .82rem; }
.calc-note strong { color: var(--text); }
.note { margin-top: 1rem; color: var(--muted); font-size: .85rem; }
@media(max-width:700px) { .calc-grid, .form-grid { grid-template-columns: 1fr; } .calc-tabs { overflow-x: auto; flex-wrap: nowrap; } .calc-tabs button { white-space: nowrap; } .calculators { padding: 2.5rem 0; } .calc-note { align-items: flex-start; flex-direction: column; } }
@media(max-width:650px) { .calc-grid { grid-template-columns: 1fr; } }
.result-error{color:#b42318!important;font-size:1rem!important}.panel input[aria-invalid="true"]{border-color:#b42318;box-shadow:0 0 0 2px rgba(180,35,24,.12)}
@media(max-width:430px){.panel{padding:1rem}.calculators h1{font-size:2.45rem}.calc-tabs{scroll-snap-type:x proximity}.calc-tabs button{min-height:48px;scroll-snap-align:start}.panel-icon{width:44px;height:44px}.result strong{font-size:1.35rem}}