/* colourdesign.co.uk — app.css. Palette pages inject their own --primary-* etc. in a <style> block. */
:root {
  --primary-50: #E9EEF2; --primary-100: #BDCDD7; --primary-300: #7B9AAF; --primary-500: #23577A; --primary-700: #1A415C; --primary-900: #122C3D;
  --secondary-50: #EDF6FC; --secondary-100: #C8E5F5; --secondary-300: #91CBEB; --secondary-500: #47A8DE; --secondary-700: #357EA6; --secondary-900: #24546F;
  --accent-a-50: #F9F5EA; --accent-a-100: #ECE0C0; --accent-a-300: #D9C282; --accent-a-500: #BF992E; --accent-a-700: #8F7322; --accent-a-900: #604C17;
  --accent-b-50: #F9EEEA; --accent-b-100: #ECCBC0; --accent-b-300: #D99882; --accent-b-500: #BF532E; --accent-b-700: #8F3E22; --accent-b-900: #602A17;
  --neutral-50: #EDEEF0; --neutral-100: #C9CED1; --neutral-300: #929CA3; --neutral-500: #4A5A66; --neutral-700: #38444C; --neutral-900: #252D33;
}
:root {
  --site: #23577A; --site-dark: #122C3D; --site-light: #47A8DE;
  --ink: #0F2A3F; --ink-soft: #4A5A66; --paper: #F4F8FB; --card: #FFFFFF; --line: #D9E2EA; --radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); line-height: 1.5; }
a { color: var(--primary-500); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; background: var(--neutral-50); padding: 1px 5px; border-radius: 4px; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px 80px; }

/* Site chrome: fixed brand colours, independent of the palette on show */
.site { background: var(--site-dark); color: #fff; }
.site-bar { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; }
.brand { color: #fff; text-decoration: none; font-weight: 700; letter-spacing: -0.01em; display: flex; align-items: center; gap: 10px; }
.brand span { opacity: .6; font-weight: 500; }
.brand i { width: 18px; height: 18px; border-radius: 5px; background: conic-gradient(#BF532E, #BF992E, #47A8DE, #23577A, #BF532E); }
.site-nav a { color: #fff; opacity: .85; text-decoration: none; margin-left: 18px; font-size: .95rem; }
.site-nav a:hover { opacity: 1; text-decoration: underline; }
.site-foot { border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .85rem; }
.site-foot .wrap { padding: 18px 24px 40px; }
.site-foot p { margin: 0 0 6px; } .muted { color: var(--neutral-300); }

/* Hero */
.hero { background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-500) 55%, var(--secondary-500) 100%); color: #fff; padding: 72px 0 56px; }
.hero .wrap { padding-bottom: 0; }
.hero-site { background: linear-gradient(135deg, var(--site-dark) 0%, var(--site) 55%, var(--site-light) 100%); }
.hero-compact { padding: 44px 0 36px; }
.hero h1 { font-size: clamp(2rem, 4vw, 3.2rem); margin: 0 0 8px; letter-spacing: -0.02em; }
.hero p { margin: 0; max-width: 60ch; opacity: .92; font-size: 1.1rem; }
.hero code { background: rgba(255,255,255,.15); color: #fff; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: .75rem; opacity: .8; margin-bottom: 12px; }
.keys { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.key { background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25); border-radius: 12px; padding: 12px 16px 12px 12px; display: flex; align-items: center; gap: 12px; backdrop-filter: blur(6px); color: #fff; text-decoration: none; }
a.key:hover { background: rgba(255,255,255,.22); }
.key i { width: 44px; height: 44px; border-radius: 10px; display: block; box-shadow: inset 0 0 0 1px rgba(255,255,255,.25); }
.key b { display: block; font-size: .95rem; }
.key small { opacity: .85; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

/* Controls */
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 28px; }
.controls label { display: flex; align-items: center; gap: 8px; font-size: .9rem; opacity: .9; }
.controls input[type=color] { width: 44px; height: 40px; border: 1px solid rgba(255,255,255,.4); border-radius: 8px; background: transparent; padding: 2px; cursor: pointer; }
.controls input[type=text], .controls select { height: 40px; border-radius: 8px; border: 1px solid rgba(255,255,255,.4); background: rgba(255,255,255,.12); color: #fff; padding: 0 12px; font-size: .95rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.controls select { font-family: inherit; }
.controls select option { color: var(--ink); }
.controls input[type=text] { width: 9.5em; text-transform: uppercase; }
.controls-big input[type=text], .controls-big select { height: 46px; font-size: 1.05rem; }
.form-error { margin-top: 12px; background: rgba(255,255,255,.15); padding: 8px 12px; border-radius: 8px; display: inline-block; }
.btn-light { background: #fff; color: var(--ink); border: 0; height: 40px; }
.controls-big .btn-light { height: 46px; }
.btn-light:hover { background: var(--secondary-50); }

/* Nav */
nav.toc { position: sticky; top: 0; z-index: 5; background: rgba(244,248,251,.9); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
nav.toc ul { list-style: none; margin: 0 auto; padding: 0 24px; max-width: 1180px; display: flex; gap: 4px; overflow-x: auto; }
nav.toc a { display: block; padding: 14px 12px; text-decoration: none; color: var(--ink-soft); font-size: .9rem; border-bottom: 2px solid transparent; white-space: nowrap; }
nav.toc a:hover, nav.toc a.active { color: var(--primary-500); border-color: var(--primary-500); }

/* Groups */
.group { margin-top: 56px; }
.group-head h2 { margin: 0; font-size: 1.5rem; display: flex; align-items: baseline; gap: 12px; }
.base-hex { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; font-weight: 500; color: var(--ink-soft); }
.group-head p { margin: 4px 0 18px; color: var(--ink-soft); }
.strip { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; }
.swatch { all: unset; cursor: pointer; display: block; border-radius: var(--radius); overflow: hidden; background: var(--card); border: 1px solid var(--line); transition: transform .15s, box-shadow .15s; }
.swatch:hover, .swatch:focus-visible { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(15,42,63,.14); outline: none; }
.chip { display: flex; justify-content: space-between; align-items: flex-start; height: 120px; background: var(--c); color: var(--t); padding: 10px 12px; font-size: .8rem; font-weight: 600; }
.chip .copy { opacity: 0; transition: opacity .15s; font-weight: 500; }
.swatch:hover .copy, .swatch:focus-visible .copy { opacity: .9; }
.swatch.copied .copy { opacity: 1; }
.meta { display: flex; flex-direction: column; gap: 2px; padding: 10px 12px 12px; font-size: .78rem; color: var(--ink-soft); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.meta strong { color: var(--ink); font-size: .9rem; }
.badges { display: flex; gap: 4px; margin-top: 6px; flex-wrap: wrap; }
.badge { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; font-size: .66rem; padding: 2px 6px; border-radius: 999px; border: 1px solid; }
.badge.aaa { color: #0B6B5B; border-color: #9ED8CC; background: #E8F6F3; }
.badge.aa { color: #1A415C; border-color: #BDCDD7; background: #E9EEF2; }
.badge.lg { color: #8A4F10; border-color: #F3D3AC; background: #FCF1E3; }
.badge.fail { color: #8B2F2F; border-color: #E9BDBD; background: #FBEAEA; }
.legend { font-size: .8rem; color: var(--ink-soft); margin-top: 14px; }

/* Cards (home examples, browse) */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.card { display: block; text-decoration: none; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .15s, box-shadow .15s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(15,42,63,.14); }
.card-strip { display: flex; height: 64px; }
.card-strip i { flex: 1; display: block; }
.card-strip i:first-child { flex: 2; }
.card-meta { display: flex; justify-content: space-between; align-items: baseline; padding: 10px 12px; gap: 8px; }
.card-meta b { font-size: .9rem; }
.card-meta small { color: var(--ink-soft); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.mode-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.mode-card { display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.mode-card:hover { border-color: var(--primary-300); }
.mode-card span { color: var(--ink-soft); font-size: .9rem; flex: 1; }
.mode-card code { align-self: flex-start; }

/* In use */
.demo { margin-top: 72px; }
.demo h2 { font-size: 1.5rem; margin: 0 0 6px; }
.demo > p { color: var(--ink-soft); margin: 0 0 20px; }
.demo-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.panel h3 { margin: 0 0 14px; font-size: 1rem; color: var(--ink); }
.btn { display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 600; font-size: .9rem; margin: 0 8px 8px 0; border: 2px solid transparent; cursor: pointer; text-decoration: none; }
.btn-primary { background: var(--primary-500); color: #fff; } .btn-primary:hover { background: var(--primary-700); }
.btn-secondary { background: var(--secondary-500); color: var(--ink); } .btn-secondary:hover { background: var(--secondary-700); color: #fff; }
.btn-outline { background: transparent; border-color: var(--primary-500); color: var(--primary-500); } .btn-outline:hover { background: var(--primary-50); }
.btn-accent-b { background: var(--accent-b-500); color: var(--ink); } .btn-accent-b:hover { background: var(--accent-b-700); color: #fff; }
.btn-accent-a { background: var(--accent-a-500); color: var(--ink); }
.mini-nav { background: var(--primary-500); color: #fff; border-radius: 8px; padding: 12px 16px; display: flex; align-items: center; gap: 18px; font-size: .9rem; }
.mini-nav b { margin-right: auto; } .mini-nav span { opacity: .85; } .mini-nav .active { opacity: 1; border-bottom: 2px solid var(--secondary-500); }
.alert { padding: 10px 14px; border-radius: 8px; border-left: 4px solid; font-size: .9rem; margin-bottom: 10px; }
.alert.info { background: var(--secondary-50); border-color: var(--secondary-500); color: var(--primary-700); }
.alert.ok { background: var(--accent-a-50); border-color: var(--accent-a-500); color: var(--accent-a-900); }
.alert.warn { background: var(--accent-b-50); border-color: var(--accent-b-500); color: var(--accent-b-900); }
.type h4 { color: var(--primary-500); margin: 0 0 6px; font-size: 1.3rem; }
.type p { margin: 0 0 8px; color: var(--ink-soft); font-size: .95rem; }
.type .muted { color: var(--neutral-300); font-size: .85rem; }
.dark { background: var(--primary-900); color: #fff; }
.dark h3 { color: var(--secondary-300); }
.dark p { color: var(--primary-100); }
.bars { display: flex; align-items: flex-end; gap: 8px; height: 90px; }
.bars i { flex: 1; border-radius: 4px 4px 0 0; }

/* Export */
.export { margin-top: 72px; }
.export h2 { font-size: 1.5rem; margin: 0 0 6px; }
.export p { color: var(--ink-soft); margin: 0 0 14px; }
pre { background: var(--primary-900); color: #DCE8F0; padding: 20px; border-radius: var(--radius); overflow-x: auto; font-size: .82rem; line-height: 1.55; margin: 0; }
.export .btn { margin-top: 12px; }

@media (max-width: 900px) { .strip { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 520px) { .strip { grid-template-columns: repeat(2, 1fr); } .chip { height: 90px; } .controls input[type=text] { flex: 1; } }