/* UK Finance Tools - mobile-first, fluid, light theme.
   Layout: CSS grid + container queries. Sizes: clamp() so type and spacing scale between phone and desktop. */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f3f4f6;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #111827;
  --text-2: #4b5563;
  --muted: #6b7280;
  --accent: #2a78d6;
  --accent-hover: #1c5cab;
  --accent-soft: #e9f1fc;
  --accent-text: #174a8a;
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --good: #0f8a3c;
  --good-soft: #e6f6ec;
  --warn: #b45309;
  --warn-soft: #fff4e5;
  --tax: #2a78d6;
  --ni: #7c5cd6;
  --sl: #eb6834;
  --pension: #1baf7a;
  --takehome: #111827;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(17, 24, 39, 0.04), 0 6px 20px -8px rgba(17, 24, 39, 0.10);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  /* fluid scale */
  --text-sm: clamp(0.8rem, 0.76rem + 0.2vw, 0.875rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1rem);
  --text-lg: clamp(1.05rem, 1rem + 0.3vw, 1.15rem);
  --text-xl: clamp(1.35rem, 1.2rem + 0.9vw, 1.8rem);
  --text-2xl: clamp(1.7rem, 1.4rem + 1.6vw, 2.3rem);
  --space-1: clamp(6px, 0.5vw + 4px, 8px);
  --space-2: clamp(10px, 1vw + 6px, 14px);
  --space-3: clamp(14px, 1.5vw + 8px, 20px);
  --space-4: clamp(18px, 2vw + 10px, 28px);
  --gutter: clamp(12px, 4vw, 24px);
  --control-h: 46px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 70px; }
body {
  margin: 0; background: var(--bg); color: var(--text); font-family: var(--font);
  font-size: var(--text-base); line-height: 1.5; -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; letter-spacing: -0.01em; overflow-wrap: anywhere; }
h1 { font-size: var(--text-xl); font-weight: 700; }
h2 { font-size: var(--text-lg); font-weight: 650; }
h3 { font-size: var(--text-base); font-weight: 650; }
p { margin: 0; }
img, svg { max-width: 100%; }
.muted { color: var(--muted); }
.small { font-size: var(--text-sm); }
.num { font-variant-numeric: tabular-nums; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Header ---------- */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.site-header .inner { max-width: 1160px; margin: 0 auto; padding: 0 var(--gutter); min-height: 56px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); letter-spacing: -0.01em; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand .logo { width: 28px; height: 28px; border-radius: 8px; background: var(--accent); display: grid; place-items: center; color: #fff; font-size: 14px; font-weight: 800; flex: none; }
.brand .brand-text { display: none; }
@media (min-width: 420px) { .brand .brand-text { display: inline; } }
.site-nav { display: flex; gap: 2px; }
.site-nav a { padding: 8px 12px; border-radius: 999px; color: var(--text-2); font-weight: 500; font-size: var(--text-sm); white-space: nowrap; min-height: 40px; display: inline-flex; align-items: center; }
.site-nav a:hover { background: var(--surface-2); text-decoration: none; }
.site-nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent-text); }

/* ---------- Layout ---------- */
.container { max-width: 1160px; margin: 0 auto; padding: var(--space-4) var(--gutter) 64px; }
.page-title { margin-bottom: 4px; }
.page-intro { color: var(--text-2); max-width: 70ch; margin-bottom: var(--space-4); }
.tool-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-3); align-items: start; }
.inputs-col, .results-col { min-width: 0; container-type: inline-size; }
@media (min-width: 960px) {
  .tool-layout { grid-template-columns: minmax(20rem, 5fr) minmax(0, 7fr); gap: var(--space-4); }
}

/* ---------- Cards ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: var(--space-3); min-width: 0; }
.card + .card, .card + details.section, details.section + .card, details.section + details.section { margin-top: var(--space-3); }
.card-header { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-2); }
.card-header > div:first-child { flex: 1 1 14rem; min-width: 0; }
.card-header p { color: var(--muted); font-size: var(--text-sm); margin-top: 2px; }
.stack { display: grid; gap: var(--space-2); }
.stack > * { min-width: 0; }
/* Two-up rows that collapse on their own when the column gets narrow */
.row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); gap: var(--space-2); }
.row > * { min-width: 0; }

/* ---------- Forms ---------- */
.field label, .field .label { display: block; font-size: var(--text-sm); font-weight: 600; color: var(--text); margin-bottom: 6px; }
.field .hint { display: block; font-size: 0.8rem; color: var(--muted); margin-top: 5px; line-height: 1.4; }
.input-wrap { display: flex; align-items: stretch; min-height: var(--control-h); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: #fff; overflow: hidden; transition: box-shadow .15s, border-color .15s; }
.input-wrap:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(42, 120, 214, 0.18); }
.input-wrap .affix { display: flex; align-items: center; padding: 0 12px; color: var(--muted); background: var(--surface-2); font-size: var(--text-sm); border-right: 1px solid var(--border); user-select: none; white-space: nowrap; flex: none; }
.input-wrap .affix.suffix { border-right: 0; border-left: 1px solid var(--border); }
.input-wrap input, .input-wrap select { flex: 1 1 0; min-width: 0; width: 100%; border: 0; outline: 0; padding: 10px 12px; font: inherit; font-size: 16px; background: transparent; color: var(--text); font-variant-numeric: tabular-nums; }
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; appearance: textfield; }
select.plain { width: 100%; min-height: var(--control-h); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); padding: 10px 34px 10px 12px; font: inherit; font-size: 16px; color: var(--text); appearance: none; -webkit-appearance: none; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%236b7280' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 12px center; }
select.plain:focus { outline: 0; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(42,120,214,.18); }

/* Segmented control: wraps to as many lines as needed, never overflows */
.segmented { display: inline-flex; flex-wrap: wrap; background: var(--surface-2); border-radius: 12px; padding: 3px; gap: 3px; max-width: 100%; }
.segmented.block { display: flex; }
.segmented.block label { flex: 1 1 0; min-width: 6.5rem; text-align: center; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label { display: flex; align-items: center; justify-content: center; min-height: 38px; padding: 6px 12px; border-radius: 9px; font-size: var(--text-sm); font-weight: 500; color: var(--text-2); cursor: pointer; line-height: 1.25; transition: background .15s, color .15s; }
.segmented label:hover { color: var(--text); }
.segmented input:checked + label { background: #fff; color: var(--text); box-shadow: 0 1px 2px rgba(0,0,0,.08), 0 0 0 1px var(--border); }
.segmented input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 1px; }
.segmented.mini label { min-height: 30px; padding: 4px 10px; font-size: 0.8rem; }
/* Narrow columns: tighter segmented labels so three options fit on one line */
@container (max-width: 420px) {
  .segmented.block label { padding-left: 6px; padding-right: 6px; font-size: 0.8rem; min-width: 5.5rem; }
}
/* Narrow results: the headline tile takes the full width; an odd last stat does too (no orphans) */
@container (max-width: 560px) {
  .hero .tile.primary { grid-column: 1 / -1; }
  .stat-row > :last-child:nth-child(odd) { grid-column: 1 / -1; }
}
.segmented.mini.block label { min-width: 3rem; }

/* Toggle switch */
.toggle { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); cursor: pointer; min-height: 44px; }
.toggle > span:first-child { min-width: 0; }
.toggle .label { font-weight: 600; font-size: var(--text-sm); }
.toggle .sub { display: block; color: var(--muted); font-size: 0.8rem; font-weight: 400; }
.toggle input { position: absolute; opacity: 0; pointer-events: none; }
.toggle .switch { flex: none; width: 44px; height: 26px; border-radius: 999px; background: var(--border-strong); position: relative; transition: background .15s; }
.toggle .switch::after { content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%; background: #fff; box-shadow: 0 1px 2px rgba(0,0,0,.2); transition: transform .15s; }
.toggle input:checked + .switch { background: var(--accent); }
.toggle input:checked + .switch::after { transform: translateX(18px); }
.toggle input:focus-visible + .switch { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Checkbox chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips input { position: absolute; opacity: 0; pointer-events: none; }
.chips label { display: inline-flex; align-items: center; min-height: 38px; padding: 6px 12px; border: 1px solid var(--border-strong); border-radius: 999px; font-size: var(--text-sm); cursor: pointer; background: #fff; color: var(--text-2); transition: all .15s; }
.chips input:checked + label { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.chips input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Collapsible sections */
details.section { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); min-width: 0; }
details.section > summary { list-style: none; cursor: pointer; padding: var(--space-2) var(--space-3); min-height: 52px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); font-weight: 650; }
details.section > summary::-webkit-details-marker { display: none; }
details.section > summary > span:first-child { min-width: 0; }
details.section > summary .sub { display: block; font-weight: 400; color: var(--muted); font-size: var(--text-sm); }
details.section > summary::after { content: ""; width: 10px; height: 10px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); transition: transform .15s; flex: none; margin-right: 4px; }
details.section[open] > summary::after { transform: rotate(-135deg); }
details.section > .body { padding: 4px var(--space-3) var(--space-3); }

/* ---------- Results ---------- */
.hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr)); gap: var(--space-2); }
.hero .tile { background: var(--surface-2); border-radius: var(--radius-sm); padding: var(--space-2) var(--space-3); min-width: 0; }
.hero .tile.primary { background: var(--accent-soft); }
.hero .tile .k { font-size: 0.75rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.hero .tile .v { font-size: clamp(1.25rem, 1rem + 1.2vw, 1.6rem); font-weight: 700; letter-spacing: -0.02em; margin-top: 2px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.hero .tile.primary .v { color: var(--accent-text); }
.hero .tile.loss { background: var(--warn-soft); }
.hero .tile.loss .v { color: var(--warn); }
.hero .tile .s { font-size: 0.78rem; color: var(--muted); margin-top: 2px; }
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr)); gap: var(--space-2); }
.stat { background: var(--surface-2); border-radius: var(--radius-sm); padding: var(--space-2); min-width: 0; }
.stat .k { font-size: 0.75rem; color: var(--muted); font-weight: 600; }
.stat .v { font-size: var(--text-lg); font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; overflow-wrap: anywhere; }
.stat .s { font-size: 0.75rem; color: var(--muted); }
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; background: var(--warn-soft); color: var(--warn); }
.badge.good { background: var(--good-soft); color: var(--good); }

/* Breakdown tables: scroll sideways only when they truly cannot fit */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-inline: calc(var(--space-3) * -1); padding-inline: var(--space-3); }
.lines { width: 100%; border-collapse: collapse; }
.lines td, .lines th { padding: 9px 0 9px 0; border-bottom: 1px solid var(--border); vertical-align: top; font-size: var(--text-sm); }
.lines td + td, .lines th + th { padding-left: 10px; }
.lines th { text-align: left; font-weight: 600; color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: .04em; }
.lines td:first-child { overflow-wrap: anywhere; }
.lines td:not(:first-child), .lines th:not(:first-child) { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.lines tr.total td { font-weight: 700; border-bottom: 0; border-top: 2px solid var(--border-strong); }
.lines tr.sub td { color: var(--text-2); padding-left: 14px; }
.lines tr.sub td:first-child::before { content: "↳ "; color: var(--muted); }
.lines tr.sub td + td { padding-left: 10px; }
.lines td .note { display: block; color: var(--muted); font-size: 0.78rem; white-space: normal; font-weight: 400; }
.lines td.neg { color: var(--text-2); }
.lines tr:last-child td { border-bottom: 0; }
.lines .band-rate { display: inline-block; min-width: 3.6em; color: var(--muted); font-size: 0.78rem; }
.lines tr.hl td { background: var(--accent-soft); }

/* Split bar */
.split { display: flex; height: 14px; border-radius: 999px; overflow: hidden; background: var(--surface-2); gap: 2px; }
.split span { display: block; height: 100%; min-width: 0; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 10px; font-size: 0.8rem; color: var(--text-2); }
.legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; background: var(--c); }

/* Notes */
.note-box { border-radius: var(--radius-sm); padding: var(--space-2) var(--space-3); font-size: var(--text-sm); background: var(--surface-2); color: var(--text-2); overflow-wrap: anywhere; }
.note-box.warn { background: var(--warn-soft); color: var(--warn); }
.note-box.good { background: var(--good-soft); color: var(--good); }
.note-box ul { margin: 6px 0 0; padding-left: 18px; }
.note-box p + p { margin-top: 6px; }

/* Explain blocks */
details.explain { margin-top: 10px; font-size: var(--text-sm); color: var(--text-2); }
details.explain summary { cursor: pointer; color: var(--accent); font-weight: 500; list-style: none; min-height: 32px; display: flex; align-items: center; }
details.explain summary::-webkit-details-marker { display: none; }
details.explain summary::before { content: "?"; flex: none; display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-text); font-size: 0.75rem; font-weight: 700; margin-right: 8px; }
details.explain .body { margin-top: 8px; padding: var(--space-2) var(--space-3); background: var(--surface-2); border-radius: var(--radius-sm); }
/* Optional input sections use a +/− marker instead of the "?" explanation marker */
details.explain.options summary::before { content: "+"; font-size: 0.9rem; }
details.explain.options[open] summary::before { content: "−"; }
details.explain .body.stack { display: grid; }
details.explain ol, details.explain ul { margin: 6px 0; padding-left: 20px; }
details.explain li + li { margin-top: 4px; }
details.explain p + p { margin-top: 8px; }

/* Custom rates editor */
.rates-editor { display: grid; gap: var(--space-2); }
.rates-editor h3 { margin-top: var(--space-1); }
.rates-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 9.5rem), 1fr)); gap: var(--space-2); }
.rates-grid .field label { font-weight: 500; font-size: 0.78rem; color: var(--text-2); }
.rates-grid .input-wrap { min-height: 40px; }
.rates-grid .input-wrap input { padding: 6px 8px; font-size: 15px; }
.rates-grid .input-wrap.changed { border-color: var(--warn); background: var(--warn-soft); }

/* Sources */
.sources { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.sources li { font-size: var(--text-sm); overflow-wrap: anywhere; }
.sources li span { display: block; color: var(--muted); font-size: 0.78rem; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 40px; padding: 8px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: #fff; font: inherit; font-size: var(--text-sm); font-weight: 600; color: var(--text); cursor: pointer; }
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); }
.btn.ghost { border-color: transparent; background: transparent; color: var(--accent); padding-left: 6px; padding-right: 6px; }

/* Charts */
.chart-wrap { position: relative; min-width: 0; }
.chart-wrap svg { width: 100%; height: auto; display: block; overflow: visible; touch-action: pan-y; }
.chart-tip { position: absolute; pointer-events: none; background: #111827; color: #fff; padding: 8px 10px; border-radius: 8px; font-size: 0.78rem; line-height: 1.4; white-space: nowrap; transform: translate(-50%, calc(-100% - 12px)); opacity: 0; transition: opacity .1s; box-shadow: 0 6px 20px -6px rgba(0,0,0,.3); z-index: 2; }
.chart-tip.show { opacity: 1; }
.chart-tip b { font-variant-numeric: tabular-nums; }
.chart-tip.left { transform: translate(0, calc(-100% - 12px)); }
.chart-tip.right { transform: translate(-100%, calc(-100% - 12px)); }
.bars { display: grid; gap: 6px; }
.bars .bar-row { display: grid; grid-template-columns: minmax(4.5rem, auto) 1fr minmax(5rem, auto); align-items: center; gap: 10px; font-size: var(--text-sm); }
.bars .bar-row .track { height: 12px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.bars .bar-row .fill { display: block; height: 100%; background: var(--series-1); border-radius: 999px; }
.bars .bar-row.current .fill { background: var(--series-2); }
.bars .bar-row.current { font-weight: 700; }
.bars .bar-row .val { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Landing */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); gap: var(--space-3); margin-top: var(--space-4); }
.tool-card { display: block; color: inherit; padding: var(--space-4); border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s; }
.tool-card:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 2px 4px rgba(17,24,39,.05), 0 14px 30px -10px rgba(17,24,39,.18); }
.tool-card .icon { width: 44px; height: 44px; border-radius: 12px; background: var(--accent-soft); color: var(--accent-text); display: grid; place-items: center; margin-bottom: var(--space-2); font-size: 20px; }
.tool-card h2 { margin-bottom: 6px; font-size: var(--text-lg); }
.tool-card p { color: var(--text-2); }
.tool-card .cta { display: inline-block; margin-top: var(--space-2); color: var(--accent); font-weight: 600; }
.hero-block { max-width: 40ch; }
.hero-block h1 { font-size: var(--text-2xl); }
.hero-block p { margin-top: 10px; color: var(--text-2); font-size: var(--text-lg); }

.site-footer { border-top: 1px solid var(--border); margin-top: 40px; padding: var(--space-3) var(--gutter); color: var(--muted); font-size: var(--text-sm); text-align: center; }
.site-footer a { color: inherit; text-decoration: underline; }

/* Sticky summary on phones/tablets (results are below the form there) */
.mobile-summary { display: none; }
@media (max-width: 959px) {
  .mobile-summary { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; background: rgba(255,255,255,.96); backdrop-filter: blur(8px); border-top: 1px solid var(--border); padding: 10px var(--gutter) calc(10px + env(safe-area-inset-bottom)); align-items: center; justify-content: space-between; gap: var(--space-2); }
  .mobile-summary .k { font-size: 0.72rem; color: var(--muted); font-weight: 600; }
  .mobile-summary .v { font-weight: 700; font-size: var(--text-lg); font-variant-numeric: tabular-nums; }
  .mobile-summary a { font-size: 0.8rem; font-weight: 600; white-space: nowrap; }
  .container { padding-bottom: 110px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }
@media print {
  .site-header, .mobile-summary, .btn, details.explain { display: none !important; }
  .card, details.section { box-shadow: none; break-inside: avoid; }
}