/* ============================================================
   Casvia — UK financial tools
   Minimal deep blue-green financial style.
   Architecture mirror of Caspenda: static, no-tracking, pure CSS.
   ============================================================ */

:root {
  --bg: #f1f6f4;
  --surface: #ffffff;
  --ink: #0e2e2b;
  --ink-soft: #57716c;
  --line: #dfe9e5;
  --brand: #0f766e;          /* deep teal — primary */
  --brand-deep: #0b3b38;     /* header gradient deep green */
  --brand-2: #0c4a5c;        /* header gradient blue-green */
  --growth: #2f9e8f;
  --contrib: #0f766e;
  --warn: #a16207;
  --warn-bg: #fdf6e9;
  --ok: #15803d;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(14,46,43,.05), 0 8px 24px rgba(14,46,43,.07);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}
.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
/* Text-block links must be distinguishable beyond colour alone (WCAG 1.4.1). */
p a, li a, td a, .breadcrumb a, .src-foot a, .note a, .faq-answer a, .card-body p a {
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}
a.btn, p a.btn, li a.btn { text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -.01em; }
p { margin: 0 0 12px; }

/* ---------- Header ---------- */
.site-header {
  background: var(--brand-deep);
  color: #eaf7f4;
  padding: 14px 0;
  position: sticky; top: 0; z-index: 20;
  box-shadow: 0 1px 0 rgba(255,255,255,.06), 0 6px 20px rgba(11,59,56,.25);
}
.site-header .container { display: flex; align-items: center; gap: 18px; }
.logo {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.15rem; color: #eaf7f4; letter-spacing: -.01em;
}
.logo:hover { text-decoration: none; opacity: .92; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 8px;
  background: rgba(255,255,255,.14);
  font-size: .95rem;
}
.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  color: #cfe6e0; padding: 7px 12px; border-radius: 8px; font-size: .94rem;
}
.nav a:hover { background: rgba(255,255,255,.1); color: #fff; text-decoration: none; }
.nav-toggle { display: none; background: none; border: 0; color: #eaf7f4; font-size: 1.3rem; cursor: pointer; }

/* ---------- Hero ---------- */
.hero { background: var(--brand-deep); color: #eaf7f4; padding: 44px 0 34px; }
.hero .badge {
  display: inline-block; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.16);
  padding: 4px 12px; border-radius: 999px; font-size: .82rem; letter-spacing: .02em; margin-bottom: 14px;
}
.hero h1 { font-size: 2.3rem; margin: 0 0 10px; color: #fff; }
.hero .sub { color: #cfe6e0; font-size: 1.08rem; max-width: 620px; margin: 0; }

/* ---------- Generic sections ---------- */
.section { padding: 40px 0; }
.section-head { margin-bottom: 24px; }
.section-head h2 { margin: 0 0 6px; font-size: 1.6rem; }
.section-head p { color: var(--ink-soft); margin: 0; max-width: 640px; }

/* ---------- Calculator shell ---------- */
.calc-shell {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); margin: 34px 0; overflow: hidden;
}
.calc-grid { display: grid; grid-template-columns: 420px 1fr; }
.calc-panel { padding: 26px 28px; }
.calc-panel.inputs { border-right: 1px solid var(--line); background: #fafcfb; }
.calc-panel h2 { margin: 0 0 18px; font-size: 1.05rem; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .86rem; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.field .hint { font-size: .8rem; color: var(--ink-soft); margin-top: 4px; }

.input-affix { position: relative; }
.input-affix .prefix {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--ink-soft); font-weight: 600; font-size: .95rem; pointer-events: none;
}
.input-affix input {
  width: 100%; padding: 10px 12px 10px 30px;
  border: 1px solid var(--line); border-radius: 10px; font-size: 1rem; color: var(--ink);
  background: #fff; font-family: var(--font);
}
.input-affix input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(15,118,110,.12); }
select.input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px;
  font-size: 1rem; color: var(--ink); background: #fff; font-family: var(--font);
}
select.input:focus { outline: none; border-color: var(--brand); }

.presets { display: flex; gap: 8px; margin-bottom: 10px; }
.preset {
  flex: 1; padding: 8px 6px; border: 1px solid var(--line); border-radius: 10px;
  background: #fff; color: var(--ink); cursor: pointer; font-size: .86rem; font-weight: 600;
  text-align: center; line-height: 1.3;
}
.preset small { display: block; font-weight: 400; color: var(--ink-soft); font-size: .74rem; }
.preset:hover { border-color: var(--brand); }
.preset.active { border-color: var(--brand); background: rgba(15,118,110,.08); color: var(--brand); }

.range-wrap { display: flex; align-items: center; gap: 10px; }
.range-wrap input[type=range] { flex: 1; accent-color: var(--brand); }
.range-val { width: 70px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; font-size: .95rem; }
.range-wrap #yearsVal, .range-wrap .yearsVal { color: var(--ink-soft); font-size: .86rem; white-space: nowrap; }

.toggle-label { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: .9rem; cursor: pointer; }
.toggle-label input[type=checkbox] { accent-color: var(--brand); width: 16px; height: 16px; }
.infl-row { margin-top: 10px; }

/* ---------- Results panel ---------- */
.result-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.result-head .label { color: var(--ink-soft); font-size: .9rem; }
.growth-share { color: var(--brand); font-size: .84rem; font-weight: 600; }
.fv { font-size: 2.5rem; font-weight: 700; letter-spacing: -.02em; color: var(--ink); margin-bottom: 14px; }
.fv small { font-size: 1rem; font-weight: 400; color: var(--ink-soft); }

.split { border-top: 1px solid var(--line); padding-top: 12px; }
.split-row { display: flex; align-items: center; gap: 8px; padding: 5px 0; font-size: .94rem; color: var(--ink-soft); }
.split-row b { margin-left: auto; color: var(--ink); font-variant-numeric: tabular-nums; }
.dot { width: 10px; height: 10px; border-radius: 3px; flex: none; }
.dot.contrib { background: var(--contrib); }
.dot.growth { background: var(--growth); }
.dot.bonus { background: #0c4a5c; }

.real-split { border-top: 1px dashed var(--line); margin-top: 12px; padding-top: 12px; }
.real-note { font-size: .82rem; color: var(--ink-soft); margin-bottom: 6px; }

.chart-box { margin: 18px 0 6px; }
.chart-box canvas { width: 100%; height: 220px; display: block; }
.chart-legend { display: flex; gap: 16px; font-size: .82rem; color: var(--ink-soft); margin-top: 8px; }
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }

.actions { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; align-items: center; }
.share-flash { color: var(--ok); font-size: .84rem; font-weight: 600; }
.btn {
  padding: 9px 16px; border-radius: 10px; border: 1px solid var(--line); background: #fff;
  color: var(--ink); font-size: .9rem; font-weight: 600; cursor: pointer; font-family: var(--font);
}
.btn:hover { border-color: var(--brand); color: var(--brand); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-deep); }

.collapse { margin-top: 16px; }
.collapse summary { cursor: pointer; font-size: .9rem; font-weight: 600; color: var(--brand); }
.table-wrap { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-top: 10px; }
.table-scroll { overflow-x: auto; max-height: 300px; overflow-y: auto; }
table { width: 100%; border-collapse: collapse; font-size: .86rem; }
th, td { padding: 8px 12px; text-align: right; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { background: #f6faf8; color: var(--ink-soft); font-weight: 600; position: sticky; top: 0; border-bottom: 1px solid var(--line); }
td { border-bottom: 1px solid #f0f5f3; color: var(--ink); font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: 0; font-weight: 700; }

/* ---------- Status / notes ---------- */
.status-note {
  display: flex; gap: 10px; align-items: flex-start; margin-top: 14px; padding: 12px 14px;
  border-radius: 10px; font-size: .86rem; line-height: 1.5;
}
.status-note.ok { background: #ecf7ef; color: var(--ok); }
.status-note.warn { background: var(--warn-bg); color: var(--warn); }
.status-note.info { background: #eef4f6; color: #0c4a5c; }

.isa-type-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.isa-type {
  padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: #fff;
  cursor: pointer; text-align: left; font-family: var(--font);
}
.isa-type b { display: block; font-size: .9rem; color: var(--ink); }
.isa-type span { font-size: .76rem; color: var(--ink-soft); display: block; margin-top: 2px; }
.isa-type:hover { border-color: var(--brand); }
.isa-type.active { border-color: var(--brand); background: rgba(15,118,110,.08); box-shadow: 0 0 0 3px rgba(15,118,110,.1); }

/* ---------- Tool cards ---------- */
.tool-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.tool-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); display: block; color: var(--ink);
  transition: transform .12s ease, border-color .12s ease;
}
.tool-card:hover { transform: translateY(-2px); border-color: var(--brand); text-decoration: none; }
.tool-card .icon { font-size: 1.6rem; margin-bottom: 10px; }
.tool-card h3 { margin: 0 0 6px; font-size: 1.08rem; }
.tool-card p { color: var(--ink-soft); font-size: .9rem; margin: 0 0 14px; }
.tool-card .go { color: var(--brand); font-weight: 600; font-size: .9rem; }

/* ---------- Trust strip ---------- */
.trust-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.trust-item { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.trust-item .t-ic { font-size: 1.4rem; }
.trust-item h4 { margin: 8px 0 4px; font-size: .98rem; }
.trust-item p { font-size: .86rem; color: var(--ink-soft); margin: 0; }

/* ---------- Article list ---------- */
.article-list { display: flex; flex-direction: column; gap: 10px; }
.article-link {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; color: var(--ink);
}
.article-link:hover { border-color: var(--brand); text-decoration: none; }
.article-link .t { font-weight: 600; font-size: .98rem; }
.article-link .s { color: var(--ink-soft); font-size: .85rem; }
.article-link .go { color: var(--brand); font-weight: 600; }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: 10px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; font-size: .96rem; }
.faq summary::-webkit-details-marker { color: var(--brand); }
.faq-body { padding: 0 0 14px; color: var(--ink-soft); font-size: .92rem; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: .82rem; color: var(--ink-soft); margin: 18px 0 0; }
.breadcrumb a { color: var(--brand); }
.breadcrumb span { color: var(--ink-soft); }

/* ---------- Roadmap chips (planned calculators) ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 12px; border-radius: 999px; background: var(--surface);
  border: 1px dashed var(--line); color: var(--ink-soft); font-size: .84rem;
}
.chip b { color: var(--ink); font-weight: 600; }

/* ---------- Data / source footnote ---------- */
.src-foot {
  font-size: .8rem; color: var(--ink-soft); border-top: 1px dashed var(--line);
  margin-top: 18px; padding-top: 12px; line-height: 1.5;
}
.src-foot a { color: var(--brand); }

/* ---------- Content pages ---------- */
.page { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 38px; margin: 34px 0; box-shadow: var(--shadow); }
.page h1 { font-size: 1.9rem; margin: 0 0 8px; }
.page .lede { color: var(--ink-soft); font-size: 1.02rem; margin-bottom: 26px; }
.page h2 { font-size: 1.25rem; margin: 28px 0 8px; }
.page h3 { font-size: 1.05rem; margin: 20px 0 6px; }
.page ul, .page ol { padding-left: 22px; }
.page li { margin-bottom: 6px; }
.page blockquote { margin: 16px 0; padding: 12px 16px; border-left: 3px solid var(--brand); background: #f6faf8; border-radius: 0 10px 10px 0; color: var(--ink-soft); }
.page table { margin: 14px 0; }
.data-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 14px 0; }
.data-table-wrap table { margin: 0; min-width: 640px; }
.page .note { font-size: .84rem; color: var(--ink-soft); }

.data-src { display: inline-block; font-size: .76rem; color: var(--ink-soft); background: #eef4f2; border: 1px solid var(--line); padding: 2px 8px; border-radius: 999px; margin-left: 6px; vertical-align: middle; }

/* ---------- Footer ---------- */
.site-footer { background: var(--brand-deep); color: #b9d5ce; padding: 40px 0 26px; margin-top: 50px; }
.site-footer .logo { color: #eaf7f4; }
.site-footer h4, .site-footer .f-head { color: #eaf7f4; font-size: .92rem; margin: 0 0 10px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 26px; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 6px; }
.footer-grid a { color: #b9d5ce; font-size: .9rem; }
.footer-grid a:hover { color: #fff; text-decoration: none; }
.footer-note { border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; font-size: .8rem; color: #8fb5ad; }
.footer-note p { margin: 0 0 4px; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .calc-grid { grid-template-columns: 1fr; }
  .calc-panel.inputs { border-right: 0; border-bottom: 1px solid var(--line); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--brand-deep); flex-direction: column; padding: 10px 20px 16px; }
  .nav.open { display: flex; }
  .nav-toggle { display: block; margin-left: auto; }
  .isa-type-grid { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 1.8rem; }
  .fv { font-size: 2rem; }
  .page { padding: 24px 20px; }
}