/* CostToRun.uk — single stylesheet. Mobile-first, accessible, light + dark. No web fonts. */

:root {
  --brand: #0b6b3a;
  --brand-dark: #095a30;
  --brand-tint: #e7f4ec;
  --accent: #b8860b;
  --ink: #14211b;
  --muted: #5a6b62;
  --line: #d9e2dc;
  --bg: #ffffff;
  --bg-soft: #f5f8f6;
  --card: #ffffff;
  --shadow: 0 1px 3px rgba(20, 33, 27, 0.08), 0 4px 16px rgba(20, 33, 27, 0.05);
  --radius: 12px;
  --maxw: 960px;
  --focus: #1a73e8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #4cc47f;
    --brand-dark: #3aa869;
    --brand-tint: #14261c;
    --accent: #e0b64d;
    --ink: #e8efe9;
    --muted: #9db0a5;
    --line: #2b3a32;
    --bg: #0e1512;
    --bg-soft: #131c17;
    --card: #16211b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --focus: #6ea8fe;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

a { color: var(--brand-dark); }
a:hover { color: var(--brand); }
@media (prefers-color-scheme: dark) { a { color: var(--brand); } }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--brand); color: #fff;
  padding: 10px 16px; z-index: 100; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky; top: 0; z-index: 20;
}
.site-header .wrap { display: flex; align-items: center; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; white-space: nowrap; }
.brand span { color: var(--brand); }
.site-nav { margin-left: auto; }
.site-nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; flex-wrap: wrap; }
.site-nav a { text-decoration: none; color: var(--ink); padding: 8px 12px; border-radius: 8px; font-weight: 600; font-size: 0.95rem; }
.site-nav a:hover, .site-nav a[aria-current="page"] { background: var(--brand-tint); color: var(--brand-dark); }
@media (prefers-color-scheme: dark) { .site-nav a[aria-current="page"], .site-nav a:hover { color: var(--brand); } }

/* Hero */
.hero { background: linear-gradient(160deg, var(--brand-tint), var(--bg)); padding: 40px 0 28px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: clamp(1.7rem, 5vw, 2.6rem); line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.02em; }
.hero p.lede { font-size: 1.15rem; color: var(--muted); margin: 0 0 8px; max-width: 40ch; }

/* Layout blocks */
main { padding: 28px 0 48px; }
section { margin: 0 0 34px; }
h1 { font-size: clamp(1.6rem, 4.5vw, 2.3rem); line-height: 1.2; letter-spacing: -0.02em; }
h2 { font-size: 1.4rem; margin-top: 2em; letter-spacing: -0.01em; }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; }
.lede { font-size: 1.12rem; color: var(--muted); }
.muted { color: var(--muted); }
small, .small { font-size: 0.86rem; }

/* Breadcrumbs */
.breadcrumbs { font-size: 0.85rem; color: var(--muted); padding: 12px 0 0; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumbs li::after { content: "›"; margin-left: 6px; color: var(--line); }
.breadcrumbs li:last-child::after { content: ""; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }

/* Cards & grid */
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.card {
  display: block; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); transition: transform .08s ease, border-color .08s ease;
}
a.card:hover { transform: translateY(-2px); border-color: var(--brand); }
.card h3 { margin: 0 0 4px; font-size: 1.05rem; }
.card .card-meta { color: var(--muted); font-size: 0.9rem; margin: 0; }
.card .card-cost { color: var(--brand-dark); font-weight: 700; margin: 8px 0 0; }
@media (prefers-color-scheme: dark) { .card .card-cost { color: var(--brand); } }

/* Calculator */
.calc { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.calc form { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-weight: 600; font-size: 0.9rem; }
.field .hint { font-weight: 400; color: var(--muted); font-size: 0.8rem; }
.field input, .field select {
  font-size: 1rem; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--ink); width: 100%;
}
.field input:focus, .field select:focus { border-color: var(--brand); }
.calc-note { font-size: 0.82rem; color: var(--muted); margin: 12px 0 0; }

/* Results */
.results { margin-top: 18px; }
.results-headline { font-size: 1.05rem; margin: 0 0 12px; }
.results-headline strong { color: var(--brand-dark); font-size: 1.3rem; }
@media (prefers-color-scheme: dark) { .results-headline strong { color: var(--brand); } }
.cost-cards { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); }
.cost-cell { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 10px; text-align: center; }
.cost-cell .period { display: block; font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.cost-cell .value { display: block; font-size: 1.22rem; font-weight: 800; margin-top: 4px; color: var(--ink); }

/* Tables */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: 0.96rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
tbody tr:hover { background: var(--bg-soft); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Buttons */
.btn {
  display: inline-block; background: var(--brand); color: #fff; text-decoration: none; font-weight: 700;
  padding: 12px 20px; border-radius: 10px; border: none; cursor: pointer; font-size: 1rem;
}
.btn:hover { background: var(--brand-dark); color: #fff; }
.btn.secondary { background: transparent; color: var(--brand-dark); border: 1.5px solid var(--brand); }
@media (prefers-color-scheme: dark) { .btn.secondary { color: var(--brand); } }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }

/* Notes / callouts */
.note {
  background: var(--brand-tint); border-left: 4px solid var(--brand); border-radius: 8px;
  padding: 12px 16px; margin: 16px 0; font-size: 0.94rem;
}
.note.warn { background: #fff6e6; border-left-color: var(--accent); }
@media (prefers-color-scheme: dark) { .note.warn { background: #2a2210; } }

/* Freshness badge */
.freshness { display: inline-flex; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--muted);
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; }
.freshness .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand); }

/* Affiliate / product block */
.products { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.product { border: 1px solid var(--line); border-radius: 10px; padding: 14px; background: var(--card); }
.product .kicker { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); font-weight: 700; }
.product .name { font-weight: 700; margin: 4px 0; }
.product a { font-weight: 600; }

/* Ad slot */
.ad-slot { margin: 24px 0; text-align: center; min-height: 0; }
.ad-slot .ad-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); display: block; margin-bottom: 4px; }

/* Comparator */
.vs-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .vs-grid { grid-template-columns: 1fr auto 1fr; align-items: start; } }
.vs-col { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.vs-mid { display: flex; align-items: center; justify-content: center; font-weight: 800; color: var(--muted); font-size: 1.3rem; }
.winner { border-color: var(--brand); box-shadow: 0 0 0 2px var(--brand-tint); }
.winner-flag { display: inline-block; background: var(--brand); color: #fff; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; padding: 2px 8px; border-radius: 999px; }

/* Chips / tag list */
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 8px 0 0; list-style: none; }
.chips a { text-decoration: none; font-size: 0.9rem; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: var(--card); }
.chips a:hover { border-color: var(--brand); color: var(--brand-dark); }

/* Prose (guides/legal) */
.prose { max-width: 68ch; }
.prose h2 { border-bottom: 1px solid var(--line); padding-bottom: 6px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 0.35em 0; }

/* FAQ */
.faq details { border: 1px solid var(--line); border-radius: 10px; padding: 4px 16px; margin: 10px 0; background: var(--card); }
.faq summary { cursor: pointer; font-weight: 600; padding: 10px 0; }
.faq details[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 8px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 32px 0; margin-top: 40px; font-size: 0.92rem; }
.footer-cols { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.site-footer h4 { margin: 0 0 8px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 4px 0; }
.site-footer a { color: var(--ink); text-decoration: none; }
.site-footer a:hover { color: var(--brand); text-decoration: underline; }
.footer-legal { margin-top: 24px; color: var(--muted); font-size: 0.84rem; }

/* Utility */
.center { text-align: center; }
.mt0 { margin-top: 0; }
.stack > * + * { margin-top: 14px; }
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }
hr { border: none; border-top: 1px solid var(--line); margin: 28px 0; }

/* 404 */
.error-page { text-align: center; padding: 40px 0; }
.error-page .code { font-size: 4rem; font-weight: 800; color: var(--brand); margin: 0; }