/* ---------- UK Tax Code — Phase 1 Gateway ---------- */
:root {
  --bg: #0a0f1e;
  --bg-2: #0f1730;
  --panel: #141d38;
  --panel-2: #18234400;
  --line: #26335c;
  --ink: #eef2fb;        /* body text — bright, high contrast */
  --ink-soft: #c3cce2;   /* only for larger meta text */
  --white: #ffffff;
  --teal: #22d3ee;
  --emerald: #10b981;
  --gold: #f5b301;
  --violet: #8b5cf6;
  --pink: #f472b6;
  --radius: 16px;
  --shadow: 0 18px 40px -18px rgba(0, 0, 0, 0.7);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 600px at 80% -10%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(139, 92, 246, 0.16), transparent 55%),
    var(--bg);
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, .brand-name { font-family: "Sora", sans-serif; letter-spacing: -0.02em; }

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Header ---------- */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 18px clamp(18px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(10, 15, 30, 0.72);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--white); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(135deg, var(--teal), var(--emerald));
  color: #04121a; font-family: "Sora"; font-weight: 800; font-size: 22px;
  box-shadow: 0 8px 20px -6px rgba(34, 211, 238, 0.6);
}
.brand-name { font-size: 20px; font-weight: 800; }
.site-nav { display: flex; gap: 22px; }
.site-nav a { color: var(--ink-soft); font-weight: 500; }
.site-nav a:hover { color: var(--white); text-decoration: none; }

/* ---------- Layout ---------- */
main { max-width: 1120px; margin: 0 auto; padding: clamp(28px, 5vw, 64px) clamp(18px, 5vw, 40px) 80px; }

/* ---------- Hero ---------- */
.hero { text-align: center; margin-bottom: 40px; }
.hero .eyebrow {
  display: inline-block; font-weight: 600; font-size: 13px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--teal);
  border: 1px solid var(--line); border-radius: 999px; padding: 7px 16px; margin-bottom: 22px;
  background: rgba(34, 211, 238, 0.06);
}
.hero h1 {
  font-size: clamp(34px, 6vw, 58px); line-height: 1.05; margin: 0 0 18px; color: var(--white);
}
.hero h1 .grad {
  background: linear-gradient(100deg, var(--teal), var(--emerald) 55%, var(--gold));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lede { font-size: clamp(17px, 2.4vw, 21px); color: var(--ink-soft); max-width: 720px; margin: 0 auto 30px; }

/* ---------- Search / filter ---------- */
.filter-wrap { max-width: 620px; margin: 0 auto 8px; position: relative; }
.filter-wrap input {
  width: 100%; padding: 17px 20px 17px 52px; font-size: 17px; color: var(--white);
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.filter-wrap input::placeholder { color: #8592b4; }
.filter-wrap input:focus { border-color: var(--teal); box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.15); }
.filter-wrap .icon { position: absolute; left: 19px; top: 50%; transform: translateY(-50%); font-size: 19px; opacity: .8; }
.filter-hint { text-align: center; color: #7f8cae; font-size: 13px; margin: 12px 0 34px; }

/* ---------- Topic grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); gap: 18px; }
.card {
  display: block; text-align: left; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; color: var(--ink);
  position: relative; overflow: hidden; transition: transform .16s, border-color .16s, box-shadow .16s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent, var(--teal)); box-shadow: var(--shadow); text-decoration: none; }
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: var(--accent, var(--teal));
}
.card .emoji { font-size: 30px; display: block; margin-bottom: 12px; }
.card h3 { margin: 0 0 6px; font-size: 19px; color: var(--white); }
.card p { margin: 0; font-size: 14.5px; color: var(--ink-soft); }
.card .tag { margin-top: 14px; display: inline-block; font-size: 12px; font-weight: 600; color: var(--accent, var(--teal)); }
.no-results { grid-column: 1 / -1; text-align: center; color: var(--ink-soft); padding: 40px; }

/* ---------- Detail page ---------- */
.back { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-soft); font-weight: 500; margin-bottom: 22px; }
.back:hover { color: var(--white); text-decoration: none; }
.detail-head { display: flex; align-items: flex-start; gap: 18px; margin-bottom: 8px; }
.detail-head .emoji { font-size: 46px; line-height: 1; }
.detail-head h1 { font-size: clamp(28px, 4.5vw, 42px); margin: 0; color: var(--white); }
.detail-head .accent-bar { height: 5px; width: 64px; border-radius: 4px; background: var(--accent, var(--teal)); margin-top: 12px; }
.detail .intro { font-size: 18px; color: var(--ink); max-width: 760px; margin: 20px 0 30px; }

.section-title { font-size: 14px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--teal); margin: 34px 0 14px; }

.facts { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.facts li {
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--accent, var(--teal));
  border-radius: 10px; padding: 13px 16px; font-size: 15.5px; color: var(--ink);
}
.facts li strong { color: var(--white); }

.sources { display: grid; gap: 12px; }
.source {
  display: flex; align-items: center; gap: 14px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 15px 18px; transition: border-color .15s, transform .15s;
}
.source:hover { border-color: var(--accent, var(--teal)); transform: translateX(3px); text-decoration: none; }
.source .stype {
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 5px 10px; border-radius: 999px; white-space: nowrap;
}
.stype.law { background: rgba(139, 92, 246, 0.18); color: #c4b5fd; }
.stype.manual { background: rgba(16, 185, 129, 0.18); color: #6ee7b7; }
.stype.guide { background: rgba(34, 211, 238, 0.16); color: #7dd3fc; }
.stype.tool { background: rgba(245, 179, 1, 0.18); color: #fcd34d; }
.source .stext { flex: 1; }
.source .stext .sname { color: var(--white); font-weight: 600; }
.source .stext .surl { color: var(--ink-soft); font-size: 13px; }
.source .arrow { color: var(--ink-soft); font-size: 20px; }

.callout {
  margin-top: 30px; background: rgba(245, 179, 1, 0.08); border: 1px solid rgba(245, 179, 1, 0.35);
  border-radius: 12px; padding: 16px 18px; font-size: 14.5px; color: var(--ink);
}
.callout strong { color: var(--gold); }
.callout-warn { background: rgba(239, 68, 68, 0.09); border-color: rgba(239, 68, 68, 0.4); }
.callout-warn strong { color: #fca5a5; }

/* ---------- Sources / About pages ---------- */
.prose { max-width: 760px; }
.prose h1 { font-size: clamp(28px, 5vw, 42px); color: var(--white); margin: 0 0 8px; }
.prose h2 { color: var(--white); margin-top: 34px; }
.prose p, .prose li { color: var(--ink); font-size: 16.5px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 34px clamp(18px, 5vw, 56px); max-width: 1120px; margin: 0 auto; }
.site-footer p { margin: 0 0 12px; font-size: 13.5px; color: var(--ink-soft); }
.site-footer .disclaimer { color: var(--ink); }
.site-footer .disclaimer strong { color: var(--gold); }
.site-footer .copyright { color: #7f8cae; }

@media (max-width: 560px) {
  .site-nav { display: none; }
  .detail-head { gap: 12px; }
}