:root {
  --bg: #f6f5f1; --fg: #1b1c1f; --muted: #66676d; --line: #e2e0d8; --card: #ffffff; --soft: #eeece5;
  --accent: #1f5bd8; --accent-fg: #ffffff; --deal: #c2410c; --good: #15803d; --bad: #b3261e; --head: #ffffff;
  --spec: #e3ecfa; --cited: #f3e8d4; --derived: #e2f1e4; --measured: #f6e0e6; --assumption: #ececec; --warn: #fff3c4;
  --radius: 12px; --shadow: 0 1px 2px rgba(0,0,0,.05), 0 2px 8px rgba(0,0,0,.04);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316; --fg: #e9e9ec; --muted: #a0a1a8; --line: #2b2d33; --card: #1b1c20; --soft: #24262b;
    --accent: #7aa2ff; --accent-fg: #0d1020; --deal: #fb923c; --good: #4ade80; --bad: #f87171; --head: #17181c;
    --spec: #22324d; --cited: #463a24; --derived: #22402a; --measured: #4a2833; --assumption: #333; --warn: #4a4120;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
main, footer { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
h1 { font-size: 1.8rem; line-height: 1.2; margin: 1.4rem 0 .6rem; letter-spacing: -.01em; }
h2 { font-size: 1.3rem; margin: 2.2rem 0 .8rem; display: flex; align-items: center; gap: 8px; }
h3 { font-size: 1.05rem; }
.small { font-size: .85rem; color: var(--muted); }
.icon { flex: none; }
.draft { background: var(--warn); padding: 6px 16px; font-size: .9rem; text-align: center; }

/* header */
header.top { background: var(--head); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.bar { max-width: 1180px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 12px 20px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 750; font-size: 1.15rem; color: var(--fg); text-decoration: none; }
.brand .icon { color: var(--accent); }
.topsearch { flex: 1 1 260px; display: flex; align-items: center; gap: 8px; background: var(--soft); border-radius: 999px; padding: 0 14px; color: var(--muted); }
.topsearch input { flex: 1; border: 0; background: transparent; color: var(--fg); font-size: 1rem; padding: 9px 0; outline: none; min-width: 0; }
nav.links { display: flex; gap: 4px 18px; flex-wrap: wrap; }
nav.links a { color: var(--fg); text-decoration: none; font-weight: 550; font-size: .95rem; }
nav.links a:hover { color: var(--accent); }
nav.cats, nav.guide { max-width: 1180px; margin: 0 auto; padding: 0 16px 10px; display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
nav.cats::-webkit-scrollbar, nav.guide::-webkit-scrollbar { display: none; }
nav.cats a, nav.guide a { flex: none; padding: 4px 12px; border-radius: 999px; background: var(--soft); color: var(--fg); text-decoration: none; font-size: .88rem; white-space: nowrap; }
nav.cats a[aria-current], nav.guide a[aria-current] { background: var(--accent); color: var(--accent-fg); }

/* home */
.hero { padding: 28px 0 8px; }
.hero h1 { font-size: clamp(1.8rem, 4.5vw, 2.7rem); margin: 0 0 .4rem; }
.hero p { color: var(--muted); max-width: 640px; margin: 0 0 16px; font-size: 1.05rem; }
.bigsearch { display: flex; align-items: center; gap: 10px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 6px 6px 6px 18px; max-width: 720px; box-shadow: var(--shadow); color: var(--muted); }
.bigsearch input { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--fg); font-size: 1.05rem; padding: 8px 0; outline: none; }
button, .btn { font: inherit; font-weight: 600; background: var(--accent); color: var(--accent-fg); border: 0; border-radius: 999px; padding: 9px 18px; cursor: pointer; text-decoration: none; display: inline-block; text-align: center; }
h3.area { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 1.2rem 0 .5rem; }
ul.tiles { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
ul.tiles a { display: flex; flex-direction: column; gap: 4px; padding: 14px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); color: var(--fg); text-decoration: none; box-shadow: var(--shadow); }
ul.tiles a:hover { border-color: var(--accent); }
ul.tiles .icon { color: var(--accent); margin-bottom: 4px; }
ul.tiles span { font-weight: 600; }
ul.tiles span.n { font-weight: 400; font-size: .8rem; color: var(--muted); }
ul.guides { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
ul.guides a { display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 16px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); color: var(--fg); text-decoration: none; }
ul.guides a:hover { border-color: var(--accent); }
ul.guides span { color: var(--muted); font-size: .92rem; }

/* featured */
section.featured h2 .icon { color: var(--deal); }
ul.feat { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
ul.feat li { display: flex; gap: 16px; align-items: flex-start; padding: 16px; background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--deal); border-radius: var(--radius); box-shadow: var(--shadow); }
ul.feat .pic { flex: none; width: 76px; height: 76px; border-radius: 10px; background: var(--soft); display: grid; place-items: center; color: var(--muted); }
ul.feat .name { font-weight: 650; font-size: 1.05rem; color: var(--fg); text-decoration: none; display: block; margin-bottom: 2px; }
ul.feat .btn { margin-top: 10px; }
.fine { display: block; font-size: .75rem; color: var(--muted); margin-top: 4px; }

/* deal cards */
ol.deals { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
li.deal { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; display: flex; flex-direction: column; gap: 6px; box-shadow: var(--shadow); }
li.deal .pic { position: relative; aspect-ratio: 4 / 3; border-radius: 8px; background: var(--soft); display: grid; place-items: center; color: var(--muted); overflow: hidden; }
li.deal .pic img { width: 100%; height: 100%; object-fit: contain; background: #fff; }
.badge { position: absolute; top: 8px; left: 8px; background: var(--deal); color: #fff; font-weight: 700; font-size: .8rem; padding: 2px 8px; border-radius: 999px; }
li.deal .name { color: var(--fg); text-decoration: none; font-weight: 550; font-size: .93rem; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
li.deal .name:hover { color: var(--accent); }
.money .now { font-size: 1.2rem; }
.money .was { color: var(--muted); font-size: .88rem; margin-left: 4px; }
li.deal .spec { font-size: .8rem; color: var(--muted); }
ul.relax { padding-left: 1.2em; }
ul.relax li { margin: 4px 0; }
li.deal .meta { display: flex; justify-content: space-between; gap: 6px; font-size: .8rem; color: var(--muted); flex-wrap: wrap; }
.low { color: var(--good); font-weight: 600; }
.claim { font-size: .8rem; color: var(--muted); }
.notice { background: var(--warn); color: var(--fg); border-radius: var(--radius); padding: 12px 16px; margin: 12px 0; }
.pager { display: flex; gap: 16px; justify-content: center; margin: 20px 0; }
.oos { color: var(--bad); font-weight: 600; font-size: .85rem; }
li.deal .btn { margin-top: auto; padding: 8px 12px; font-size: .9rem; }

/* search page */
form.search { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; align-items: center; }
form.search input[type=search] { flex: 1 1 260px; padding: 10px 14px; font-size: 1rem; border: 1px solid var(--line); border-radius: 999px; background: var(--card); color: var(--fg); }
form.search select, .filters input[type=number] { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--fg); }
.filters input[type=number] { width: 6.5em; }
form.search details { flex-basis: 100%; }
form.search summary { cursor: pointer; font-weight: 600; }
.filters { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; padding: 12px 0; }
form.search > .filters { padding: 0; }
.filters fieldset { border: 1px solid var(--line); border-radius: 8px; display: flex; flex-wrap: wrap; gap: 4px 16px; }
.chips .chip { display: inline-block; margin: 0 4px; padding: 2px 10px; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; background: var(--card); }

/* product page */
.phead { display: flex; gap: 20px; align-items: flex-start; margin-top: 1.2rem; }
.phead .pic { flex: none; width: 180px; aspect-ratio: 1; border-radius: var(--radius); background: var(--soft); display: grid; place-items: center; color: var(--muted); overflow: hidden; }
.phead .pic img { width: 100%; height: 100%; object-fit: contain; background: #fff; }
.phead h1 { margin-top: 0; }
.badge-inline { background: var(--deal); color: #fff; font-weight: 700; font-size: .8rem; padding: 1px 8px; border-radius: 999px; }
@media (max-width: 640px) { .phead { flex-direction: column; } .phead .pic { width: 120px; } }

/* guide pages (labelled numbers, tables, machine cards) */
.lbl { display: inline-block; font-size: .7rem; padding: 0 5px; border-radius: 3px; vertical-align: 1px; color: var(--fg); }
.lbl-spec { background: var(--spec); } .lbl-cited { background: var(--cited); } .lbl-derived { background: var(--derived); }
.lbl-measured { background: var(--measured); } .lbl-assumption { background: var(--assumption); }
.src { font-size: .72rem; text-decoration: none; }
.scroll { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { font-weight: 600; background: var(--soft); }
pre { background: var(--card); border: 1px solid var(--line); padding: 8px; overflow-x: auto; }
.disclosure { border-left: 3px solid var(--accent); padding-left: 12px; }
.disclosure-line { font-size: .85rem; color: var(--muted); }
ol.cards, ul.cards { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; display: flex; flex-direction: column; gap: 4px; box-shadow: var(--shadow); }
.card .title { font-weight: 600; text-decoration: none; }
ul.cards.entry .card span { color: var(--muted); font-size: .92rem; }
.drop { display: inline-block; font-size: .8rem; background: var(--derived); padding: 0 6px; border-radius: 3px; }
.go { font-weight: 600; }
.sources ol { padding-left: 1.2rem; font-size: .85rem; }
.satya { background: var(--warn); }

footer { margin-top: 3.5rem; padding-top: 14px; padding-bottom: 28px; border-top: 1px solid var(--line); font-size: .85rem; color: var(--muted); }

@media (max-width: 640px) {
  header.top { position: static; }
  .bar { gap: 8px 10px; }
  .brand { margin-right: auto; }
  nav.links { gap: 12px; }
  nav.links a { font-size: .85rem; }
  .topsearch { order: 3; flex-basis: 100%; }
  h1 { font-size: 1.5rem; }
  .bigsearch button { padding: 9px 14px; }
  ol.deals { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  li.deal { padding: 10px; }
  li.deal .btn { font-size: .82rem; padding: 7px 8px; }
  ul.tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  ul.tiles a { padding: 10px; }
  ul.feat li { flex-direction: column; }
}