/* DJL50143 portal — design tokens: change colours here only */
:root {
  --bg: #FBF4F5; --card: #FFFFFF; --ink: #1C1215; --ink-2: #5A474C; --line: #EBD3D9;
  --navy: #141012; --blue: #B8325A; --teal: #A8791C; --amber: #D4A017; --red: #C0392B; --green: #2E8B57;
  --tint: #FBE9EE; --formula: #FFF5D6; --hot: #D9622B; --cold: #B8325A;
  --accent: var(--blue);
  --shadow: 0 1px 2px rgba(40,10,20,.07), 0 4px 14px rgba(40,10,20,.07);
  --radius: 12px;
  --font: Inter, "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
}
:root[data-theme="dark"] {
  --bg: #0C0809; --card: #1A1215; --ink: #F6ECEE; --ink-2: #C9B3B8; --line: #3A2A2F;
  --navy: #060404; --blue: #F0708F; --teal: #E8C15A; --amber: #F0BC30; --red: #E4685A; --green: #55C285;
  --tint: #2C1A20; --formula: #2E2714; --hot: #F08A57; --cold: #F0708F;
  --shadow: 0 1px 2px rgba(0,0,0,.4);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--font); }
a { color: var(--blue); }
h1, h2, h3 { color: var(--navy); line-height: 1.25; margin: 0 0 .5em; }
:root[data-theme="dark"] h1, :root[data-theme="dark"] h2, :root[data-theme="dark"] h3 { color: var(--ink); }
h1 { font-size: 1.9rem; } h2 { font-size: 1.35rem; } h3 { font-size: 1.1rem; }
.muted { color: var(--ink-2); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }

/* header */
.top { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 20; box-shadow: var(--shadow); }
.top .wrap { display: flex; align-items: center; gap: 14px; min-height: 56px; flex-wrap: wrap; }
.brand { color: #fff; text-decoration: none; font-weight: 700; letter-spacing: .2px; display: flex; flex-direction: column; line-height: 1.15; }
.brand small { font-weight: 400; opacity: .8; font-size: .75rem; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; margin-left: 8px; }
.nav a { color: #F1E4E7; text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: .92rem; }
.nav a:hover, .nav a.on { background: rgba(255,255,255,.14); color: #fff; }
.tools { margin-left: auto; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.seg { display: inline-flex; border: 1px solid rgba(255,255,255,.35); border-radius: 8px; overflow: hidden; }
.seg button { background: transparent; color: #F1E4E7; border: 0; padding: 5px 10px; cursor: pointer; font: inherit; font-size: .85rem; }
.seg button.on { background: #fff; color: var(--navy); font-weight: 600; }
.chip { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.35); border-radius: 8px; padding: 5px 10px; cursor: pointer; font: inherit; font-size: .85rem; }
.chip:hover { background: rgba(255,255,255,.22); }

main { padding: 24px 0 64px; min-height: 70vh; }
.crumbs { font-size: .88rem; color: var(--ink-2); margin-bottom: 12px; }
.crumbs a { text-decoration: none; }

/* cards & grid */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.card.topic { border-top: 5px solid var(--accent); text-decoration: none; color: inherit; display: block; transition: transform .12s; }
.card.topic:hover { transform: translateY(-2px); }
.card.topic .num { font-size: .78rem; font-weight: 700; letter-spacing: .08em; color: var(--accent); text-transform: uppercase; }
.card.topic h3 { margin: 4px 0 8px; }
.tag { display: inline-block; font-size: .74rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; background: var(--tint); color: var(--navy); border: 1px solid var(--line); margin-right: 4px; }
:root[data-theme="dark"] .tag { color: var(--ink); }
.tag.pyq { background: #FFF1D1; color: #7A5600; border-color: #E8C874; }
.tag.new { background: #DDF1E6; color: #1E6B42; border-color: #9ED5B5; }
.tag.ext { background: #EADFF5; color: #5A2C86; border-color: #C9B2E0; }
:root[data-theme="dark"] .tag.pyq { background: #4A3500; color: #FFE08A; border-color: #B8861B; }
:root[data-theme="dark"] .tag.new { background: #0F3D26; color: #9BE8BC; border-color: #2E8B57; }
:root[data-theme="dark"] .tag.ext { background: #3A2457; color: #DCC4F5; border-color: #8A63B8; }
.bar { height: 8px; background: var(--tint); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent, var(--blue)); border-radius: 99px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.sp { justify-content: space-between; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; background: var(--blue); color: #fff; border: 0; border-radius: 9px; padding: 8px 14px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--blue); border: 1px solid var(--blue); }
.btn.sm { padding: 4px 10px; font-size: .85rem; }
.btn.ok { background: var(--green); } .btn.bad { background: var(--red); }
.btn:focus-visible, input:focus-visible, select:focus-visible, .chip:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }
input[type=text], input[type=number], select { font: inherit; padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); }

/* tabs */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--line); margin: 14px 0 20px; flex-wrap: wrap; }
.tabs a { padding: 8px 14px; text-decoration: none; color: var(--ink-2); border-bottom: 3px solid transparent; margin-bottom: -2px; font-weight: 600; }
.tabs a.on { color: var(--accent); border-color: var(--accent); }

/* bilingual */
.bi { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.bi > .bm { border-left: 3px solid var(--teal); padding-left: 12px; color: var(--ink-2); font-style: italic; }
.inl.bm { display: block; color: var(--ink-2); font-style: italic; }
@media (max-width: 760px) { .bi { grid-template-columns: 1fr; } }

/* content blocks */
.formula { background: var(--formula); border-left: 4px solid var(--amber); border-radius: 8px; padding: 10px 16px; margin: 12px 0; overflow-x: auto; }
.formula .lbl { font-size: .8rem; color: var(--ink-2); margin-bottom: 4px; }
.callout { border-radius: 8px; padding: 10px 14px; margin: 12px 0; border-left: 4px solid var(--blue); background: var(--tint); }
.callout.exam { border-color: var(--amber); } .callout.warn { border-color: var(--red); }
table.t { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: .95rem; }
table.t th { background: var(--navy); color: #fff; text-align: left; padding: 8px 10px; }
table.t td { border-bottom: 1px solid var(--line); padding: 8px 10px; vertical-align: top; }
.diagram { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px; margin: 12px 0; text-align: center; }
.diagram svg { max-width: 100%; height: auto; }
.diagram figcaption { font-size: .85rem; color: var(--ink-2); }
svg .ax { stroke: var(--ink-2); stroke-width: 1.5; fill: none; }
svg .dome { stroke: var(--ink-2); stroke-width: 2; fill: var(--tint); }
svg .proc { stroke: var(--blue); stroke-width: 2.6; fill: none; }
svg .hot { stroke: var(--hot); } svg .cold { stroke: var(--cold); }
svg .dash { stroke-dasharray: 5 4; }
svg text { fill: var(--ink); font: 600 12px var(--font); }
svg text.s { font-weight: 400; font-size: 11px; fill: var(--ink-2); }
svg .box { fill: var(--card); stroke: var(--navy); stroke-width: 2; }
:root[data-theme="dark"] svg .box { stroke: var(--blue); }
svg .pt { fill: var(--navy); } :root[data-theme="dark"] svg .pt { fill: var(--ink); }

/* question card */
.q { margin-bottom: 18px; }
.q .meta { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.q .marks { margin-left: auto; font-weight: 700; color: var(--navy); }
:root[data-theme="dark"] .q .marks { color: var(--ink); }
.q .stem { margin: 8px 0 12px; }
.part { border-top: 1px dashed var(--line); padding: 10px 0; }
.part .lab { font-weight: 700; color: var(--accent); margin-right: 6px; }
.sol { background: var(--tint); border-radius: 8px; padding: 10px 14px; margin-top: 8px; }
.sol ol { margin: 6px 0 0 18px; padding: 0; }
.sol .final { font-weight: 700; color: var(--green); }
.res { font-weight: 700; margin-left: 6px; }
.res.ok { color: var(--green); } .res.bad { color: var(--red); }
.note { font-size: .88rem; color: var(--ink-2); border-left: 3px solid var(--amber); padding-left: 10px; margin-top: 8px; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; align-items: center; }

/* slides */
.deck { position: fixed; inset: 0; z-index: 50; background: var(--bg); display: flex; flex-direction: column; }
.deck .bar2 { background: var(--navy); color: #fff; display: flex; gap: 10px; align-items: center; padding: 8px 16px; }
.deck .stage { flex: 1; overflow: auto; display: flex; align-items: center; justify-content: center; padding: 16px; }
.slide { width: min(1180px, 100%); min-height: min(620px, 80vh); background: var(--card); border-radius: 14px; box-shadow: var(--shadow); border-top: 8px solid var(--accent); padding: 36px 48px; position: relative; font-size: clamp(17px, 2vw, 24px); }
.slide h2 { font-size: 1.7em; margin-bottom: .6em; }
.slide.title { text-align: center; display: flex; flex-direction: column; justify-content: center; background: linear-gradient(160deg, #0A0707, #6E1F3A); color: #fff; border-top-color: var(--amber); }
.slide.title h2, .slide.title .muted { color: #fff; }
.slide .foot { position: absolute; left: 48px; right: 48px; bottom: 12px; display: flex; justify-content: space-between; font-size: .55em; color: var(--ink-2); }
.slide.title .foot { color: #C9D6E8; }
.slide ul { padding-left: 1.2em; } .slide li { margin: .35em 0; }
.deck .prog { height: 4px; background: var(--line); } .deck .prog i { display: block; height: 100%; background: var(--amber); }
.slide .q { box-shadow: none; border: 1px solid var(--line); font-size: .72em; }

/* calculators */
.calc { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } }
.field { display: grid; grid-template-columns: 1fr 110px 60px; gap: 8px; align-items: center; margin: 6px 0; }
.field span.u { color: var(--ink-2); font-size: .85rem; }
.out { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.out b { color: var(--navy); } :root[data-theme="dark"] .out b { color: var(--ink); }

.empty { text-align: center; color: var(--ink-2); padding: 40px 0; }
footer { border-top: 1px solid var(--line); padding: 18px 0; color: var(--ink-2); font-size: .85rem; }

/* paper print */
#print-root { display: none; }
.paper h1 { font-size: 1.4rem; text-align: center; margin: 0; }
.paper .hdr { text-align: center; border-bottom: 2px solid #000; padding-bottom: 8px; margin-bottom: 14px; }
.paper .pq { margin: 14px 0; page-break-inside: avoid; }
@media print {
  body { background: #fff !important; color: #000 !important; font-size: 11pt; }
  .top, main, footer, .deck { display: none !important; }
  #print-root { display: block !important; }
  .slide-p { page-break-after: always; border: 1px solid #999; padding: 20px; min-height: 90vh; }
  .formula { background: #fff !important; border-color: #000; }
  svg text { fill: #000 !important; } svg .dome { fill: #fff; stroke: #000; } svg .proc { stroke: #000 !important; }
  .sol { background: #f3f3f3 !important; }
}