/* ===========================================================
   50pence.co.uk theme
   Palette derived from royalmint.com's own CSS custom properties
   (--primary:#211c35 --secondary:#726d7f --success:#0c6b4d
    --danger:#e1261c --warning:#ffc107), extended with a metallic
   gold accent for "gold proof" / rarity cues. System font stacks
   only - no webfont download, so nothing blocks first paint.
   =========================================================== */

:root {
  /* brand */
  --rm-navy: #211c35;
  --rm-navy-700: #302a4c;
  --rm-navy-100: #ece9f3;
  --rm-gold: #a9812f;
  --rm-gold-100: #f6ecd3;
  --rm-green: #0c6b4d;
  --rm-red: #b91c1c;
  --rm-amber: #b45309;

  /* semantic tokens - light (default) */
  --bg: #fbfaf8;
  --bg-elevated: #ffffff;
  --bg-inset: #f4f2ee;
  --text: #221e2c;
  --text-muted: #5b5665;
  --border: #e4e0d8;
  --link: var(--rm-navy);
  --link-hover: var(--rm-gold);
  --header-bg: var(--rm-navy);
  --header-text: #f7f5ef;
  --accent: var(--rm-gold);
  --accent-text: #2b2308;
  --chip-bg: var(--rm-navy-100);
  --chip-text: var(--rm-navy);
  --success: var(--rm-green);
  --danger: var(--rm-red);
  --shadow: 0 1px 3px rgba(33, 28, 53, 0.08), 0 1px 2px rgba(33, 28, 53, 0.06);
  --radius: 10px;
  --font-heading: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #16131f;
    --bg-elevated: #1f1b2c;
    --bg-inset: #241f33;
    --text: #f1eef7;
    --text-muted: #b6b0c4;
    --border: #362f49;
    --link: #cdbef0;
    --link-hover: var(--rm-gold);
    --header-bg: #120f1a;
    --header-text: #f1eef7;
    --accent: #d9b65a;
    --accent-text: #241c05;
    --chip-bg: #2c2640;
    --chip-text: #d9d2ec;
    --success: #34b986;
    --danger: #f26161;
    --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  }
}

:root[data-theme="dark"] {
  --bg: #16131f;
  --bg-elevated: #1f1b2c;
  --bg-inset: #241f33;
  --text: #f1eef7;
  --text-muted: #b6b0c4;
  --border: #362f49;
  --link: #cdbef0;
  --link-hover: var(--rm-gold);
  --header-bg: #120f1a;
  --header-text: #f1eef7;
  --accent: #d9b65a;
  --accent-text: #241c05;
  --chip-bg: #2c2640;
  --chip-text: #d9d2ec;
  --success: #34b986;
  --danger: #f26161;
  --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  transition: background-color .15s ease, color .15s ease;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-heading); line-height: 1.25; margin: 0 0 .5em; color: var(--text); }
h1 { font-size: clamp(1.8rem, 1.4rem + 1.6vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 1.2rem + 0.8vw, 1.9rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }
table { border-collapse: collapse; width: 100%; }
ul, ol { padding-left: 1.25em; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.25rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-text); padding: .6em 1em; z-index: 1000; }
.skip-link:focus { left: 1rem; top: 1rem; }

/* ---------- header ---------- */
.site-header { background: var(--header-bg); color: var(--header-text); }
.site-header .container { display: flex; align-items: center; gap: 1.5rem; padding-top: .9rem; padding-bottom: .9rem; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: .6rem; color: var(--header-text); font-family: var(--font-heading); font-size: 1.35rem; font-weight: 700; }
.brand:hover { color: var(--accent); text-decoration: none; }
.brand .coin-mark { width: 30px; height: 30px; border-radius: 50%; background: linear-gradient(145deg, var(--rm-gold), #7c5f1f); display: inline-flex; align-items: center; justify-content: center; color: #2b2308; font-weight: 800; font-size: .85rem; font-family: var(--font-body); flex: none; }
.main-nav { display: flex; flex-wrap: wrap; gap: 1.1rem; margin-left: auto; }
.main-nav a { color: var(--header-text); opacity: .88; font-size: .95rem; }
.main-nav a:hover, .main-nav a:focus { opacity: 1; color: var(--accent); }
.header-tools { display: flex; align-items: center; gap: .6rem; }
.theme-toggle { background: transparent; border: 1px solid rgba(255,255,255,.3); color: var(--header-text); border-radius: 999px; width: 38px; height: 38px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.nav-toggle { display: none; background: transparent; border: 1px solid rgba(255,255,255,.3); color: var(--header-text); border-radius: 8px; width: 38px; height: 38px; cursor: pointer; }

@media (max-width: 780px) {
  .main-nav { display: none; width: 100%; order: 3; flex-direction: column; gap: .1rem; background: var(--header-bg); }
  .main-nav.open { display: flex; }
  .main-nav a { padding: .55rem 0; border-top: 1px solid rgba(255,255,255,.12); }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
}

/* ---------- buttons / chips ---------- */
.btn { display: inline-flex; align-items: center; gap: .4em; padding: .6em 1.1em; border-radius: 999px; border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text); font-weight: 600; cursor: pointer; font-size: .95rem; }
.btn:hover { border-color: var(--accent); color: var(--link-hover); text-decoration: none; }
.btn-primary { background: var(--rm-navy); border-color: var(--rm-navy); color: #fff; }
.btn-primary:hover { background: var(--rm-navy-700); color: #fff; }
.btn-gold { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-gold:hover { filter: brightness(1.05); color: var(--accent-text); }
.btn-sm { padding: .35em .8em; font-size: .82rem; }
.chip { display: inline-block; background: var(--chip-bg); color: var(--chip-text); border-radius: 999px; padding: .2em .75em; font-size: .78rem; font-weight: 600; }
.chip-rare { background: var(--rm-red); color: #fff; }
.chip-gold { background: var(--rm-gold); color: #2b2308; }
.chip-value { background: var(--success); color: #fff; }

/* ---------- layout blocks ---------- */
.section { padding: 2.5rem 0; }
.section-tight { padding: 1.5rem 0; }
.section-inset { background: var(--bg-inset); }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; font-weight: 700; color: var(--rm-gold); margin-bottom: .4em; display: block; }
.hero { background: linear-gradient(160deg, var(--rm-navy), #372e57); color: #f5f2ec; padding: 3.5rem 0; }
.hero h1 { color: #fff; }
.hero p.lede { color: #d9d4ea; font-size: 1.1rem; max-width: 60ch; }
.hero-search { display: flex; gap: .5rem; max-width: 520px; margin-top: 1.5rem; flex-wrap: wrap; }
.hero-search input[type=search] { flex: 1 1 240px; padding: .75em 1em; border-radius: 999px; border: none; font-size: 1rem; }
.breadcrumbs { font-size: .85rem; color: var(--text-muted); margin-bottom: 1rem; }
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs a:hover { color: var(--link-hover); }

/* ---------- grid / cards ---------- */
.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.card-media { aspect-ratio: 1 / 1; background: var(--bg-inset); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.card-media img { width: 100%; height: 100%; object-fit: contain; padding: .75rem; }
.card-body { padding: 1rem; display: flex; flex-direction: column; gap: .4rem; flex: 1; }
.card-body h3 { font-size: 1.05rem; margin-bottom: 0; }
.card-body h3 a { color: var(--text); }
.card-meta { font-size: .82rem; color: var(--text-muted); }
.card-value { margin-top: auto; font-weight: 700; color: var(--rm-navy); }
:root[data-theme="dark"] .card-value, @media (prefers-color-scheme: dark) { }
[data-theme="dark"] .card-value { color: var(--accent); }

/* ---------- coin detail ---------- */
.coin-hero { display: grid; grid-template-columns: minmax(220px, 340px) 1fr; gap: 2rem; align-items: start; }
@media (max-width: 780px) { .coin-hero { grid-template-columns: 1fr; } }
.coin-hero .card-media { border-radius: var(--radius); border: 1px solid var(--border); }
.spec-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(180px,1fr)); gap: .75rem 1.5rem; }
.spec-list li { border-top: 1px solid var(--border); padding-top: .4rem; }
.spec-list .label { display: block; font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-muted); }
.spec-list .value { font-weight: 600; }

.variants-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.variants { min-width: 720px; }
table.variants th, table.variants td { padding: .75em .9em; text-align: left; border-bottom: 1px solid var(--border); font-size: .92rem; white-space: nowrap; }
table.variants th { background: var(--bg-inset); font-family: var(--font-heading); font-weight: 700; }
table.variants tr:last-child td { border-bottom: none; }
table.variants td.wrap { white-space: normal; }

.variant-list { display: grid; grid-template-columns: 1fr; gap: 1.5rem; margin-top: 1.5rem; }
.variant-row { display: grid; grid-template-columns: minmax(200px, 300px) 1fr; gap: 1.5rem; align-items: start; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.25rem; }
@media (max-width: 680px) { .variant-row { grid-template-columns: 1fr; } }
.variant-row .v-media { aspect-ratio: 1 / 1; background: var(--bg-inset); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; display: flex; align-items: center; justify-content: center; }
.variant-row .v-media img { width: 100%; height: 100%; object-fit: contain; padding: 1rem; cursor: zoom-in; }
.variant-row h3 { margin: 0 0 .85rem; font-size: 1.15rem; }
.variant-row .btn { margin-top: 1rem; }

.plain-table { width: 100%; border-collapse: collapse; margin-top: .75rem; font-size: .9rem; }
.plain-table th, .plain-table td { padding: .55em .8em; border-bottom: 1px solid var(--border); text-align: left; }
.plain-table th { font-family: var(--font-heading); background: var(--bg-inset); font-weight: 700; }
.plain-table tr:last-child td { border-bottom: none; }

.faq { border-top: 1px solid var(--border); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary { cursor: pointer; padding: 1em 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1em; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--rm-gold); font-size: 1.3rem; line-height: 1; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding-bottom: 1em; color: var(--text-muted); }

/* ---------- footer ---------- */
.site-footer { background: var(--rm-navy); color: #cfc9df; margin-top: 3rem; }
:root[data-theme="dark"] .site-footer, [data-theme="dark"] .site-footer { background: #0e0c16; }
.site-footer .container { padding: 2.5rem 1.25rem 1.5rem; display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.site-footer h4 { color: #fff; font-size: .95rem; text-transform: uppercase; letter-spacing: .06em; font-family: var(--font-body); }
.site-footer a { color: #cfc9df; }
.site-footer a:hover { color: var(--rm-gold); }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 1rem 1.25rem 1.5rem; font-size: .82rem; color: #a79fc0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; max-width: var(--max-width); margin: 0 auto; }
.social-links { display: flex; gap: .75rem; }
.social-links a { width: 34px; height: 34px; border-radius: 50%; border: 1px solid rgba(255,255,255,.25); display: inline-flex; align-items: center; justify-content: center; font-size: .85rem; }
.social-links a:hover { border-color: var(--rm-gold); color: var(--rm-gold); }

/* ---------- affiliate link ---------- */
.affiliate-link { display: inline-flex; flex-direction: column; align-items: flex-start; gap: .3rem; margin-top: .25rem; }
.affiliate-link .btn { padding: .65em 1.3em; }
.affiliate-link .affiliate-tag { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); padding-left: .2rem; }
.affiliate-link .affiliate-tag a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.affiliate-link .affiliate-tag a:hover { color: var(--link-hover); }

/* ---------- image lightbox ---------- */
.lightbox-trigger { cursor: zoom-in; }
#img-lightbox { position: fixed; inset: 0; background: rgba(10,8,16,.9); z-index: 2000; display: none; align-items: center; justify-content: center; padding: 2.5rem 1.5rem; }
#img-lightbox.show { display: flex; }
#img-lightbox figure { margin: 0; max-width: 92vw; max-height: 90vh; display: flex; flex-direction: column; align-items: center; gap: .75rem; }
#img-lightbox img { max-width: 92vw; max-height: 80vh; width: auto; height: auto; border-radius: 10px; background: #fff; object-fit: contain; }
#img-lightbox figcaption { color: #e8e4f2; font-size: .9rem; text-align: center; }
#img-lightbox .lightbox-close { position: fixed; top: 1rem; right: 1.25rem; background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.25); width: 42px; height: 42px; border-radius: 50%; font-size: 1.5rem; line-height: 1; cursor: pointer; }
#img-lightbox .lightbox-close:hover { background: rgba(255,255,255,.28); }

/* ---------- cookie banner ---------- */
#cookie-banner { position: fixed; inset: auto 0 0 0; background: var(--bg-elevated); border-top: 1px solid var(--border); box-shadow: 0 -4px 16px rgba(0,0,0,.15); padding: 1rem 1.25rem; z-index: 999; display: none; }
#cookie-banner.show { display: block; }
.cookie-inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap; }
.cookie-inner p { margin: 0; flex: 1 1 320px; font-size: .9rem; color: var(--text-muted); }
.cookie-actions { display: flex; gap: .6rem; flex-wrap: wrap; }

/* ---------- forms ---------- */
label { font-weight: 600; font-size: .88rem; display: block; margin-bottom: .3em; }
input, textarea, select { width: 100%; padding: .6em .75em; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-elevated); color: var(--text); font-family: inherit; font-size: .95rem; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.field { margin-bottom: 1rem; }

/* ---------- misc ---------- */
.callout { background: var(--rm-gold-100); border: 1px solid var(--rm-gold); color: #4a3a0e; border-radius: var(--radius); padding: 1rem 1.25rem; }
[data-theme="dark"] .callout, @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .callout { background: #2c2408; color: #f0dfa4; border-color: var(--rm-gold); } }
.pagination { display: flex; gap: .4rem; justify-content: center; margin-top: 2rem; flex-wrap: wrap; }
.pagination a, .pagination span { padding: .5em .9em; border: 1px solid var(--border); border-radius: 6px; }
.pagination .current { background: var(--rm-navy); color: #fff; border-color: var(--rm-navy); }