:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --border: #d9dee6;
  --text: #14181f;
  --muted: #5c6673;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --good: #17794c;
  --good-soft: #e3f4ec;
  --warn: #9a6200;
  --warn-soft: #fdf2dc;
  --bad: #c02b2b;
  --bad-soft: #fceceb;
  --shadow: 0 1px 2px rgba(16,22,32,.06), 0 4px 16px rgba(16,22,32,.05);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117; --surface: #161b22; --surface-2: #1c232c; --border: #2b3440;
    --text: #e6edf3; --muted: #9aa7b4; --accent: #58a6ff; --accent-soft: #16283f;
    --good: #56d39a; --good-soft: #10251c; --warn: #e3b341; --warn-soft: #2a2113;
    --bad: #f47c7c; --bad-soft: #2d1717;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"] {
  --bg: #0d1117; --surface: #161b22; --surface-2: #1c232c; --border: #2b3440;
  --text: #e6edf3; --muted: #9aa7b4; --accent: #58a6ff; --accent-soft: #16283f;
  --good: #56d39a; --good-soft: #10251c; --warn: #e3b341; --warn-soft: #2a2113;
  --bad: #f47c7c; --bad-soft: #2d1717;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.3);
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--sans); line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 940px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); }

header.site {
  border-bottom: 1px solid var(--border); background: var(--surface);
  position: sticky; top: 0; z-index: 10;
}
header.site .wrap { display: flex; align-items: center; gap: 16px; height: 58px; }
.logo { font-weight: 650; letter-spacing: -.02em; font-size: 1.02rem; display: flex; align-items: center; gap: 9px; }
.logo svg { width: 20px; height: 20px; flex: none; }
header.site nav { margin-left: auto; display: flex; gap: 18px; font-size: .9rem; }
header.site nav a { color: var(--muted); text-decoration: none; }
header.site nav a:hover { color: var(--text); }
#theme { background: none; border: 1px solid var(--border); color: var(--muted); border-radius: 7px;
         cursor: pointer; width: 30px; height: 30px; font-size: .85rem; }

.hero { padding: 62px 0 30px; text-align: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 2.9rem); margin: 0 0 12px; letter-spacing: -.03em; line-height: 1.14; }
.hero p.lede { font-size: 1.09rem; color: var(--muted); max-width: 620px; margin: 0 auto 26px; }
.btn {
  background: var(--accent); color: #fff; border: 0; border-radius: 9px;
  padding: 13px 28px; font-size: 1rem; font-weight: 560; cursor: pointer;
  font-family: inherit; transition: filter .15s;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--border); }

#progress { margin-top: 26px; color: var(--muted); font-size: .92rem; min-height: 24px; font-family: var(--mono); }
.bar { height: 3px; background: var(--surface-2); border-radius: 3px; overflow: hidden; max-width: 380px; margin: 12px auto 0; }
.bar > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .35s ease; }

section.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 26px; margin: 18px 0; box-shadow: var(--shadow);
}
h2 { font-size: 1.24rem; margin: 0 0 6px; letter-spacing: -.02em; }
h3 { font-size: 1rem; margin: 0 0 4px; }
.sub { color: var(--muted); font-size: .93rem; margin: 0 0 18px; }

/* ---- verdict ---- */
.verdict { text-align: left; display: grid; grid-template-columns: 1fr 260px; gap: 30px; align-items: center; }
@media (max-width: 720px) { .verdict { grid-template-columns: 1fr; } }
.verdict h2 { font-size: 1.75rem; line-height: 1.22; margin-bottom: 10px; }
.verdict p { margin: 0; color: var(--muted); }
.pill { display: inline-block; padding: 4px 11px; border-radius: 100px; font-size: .78rem;
        font-weight: 600; letter-spacing: .02em; margin-bottom: 14px; }
.pill.trackable { background: var(--bad-soft); color: var(--bad); }
.pill.randomized { background: var(--good-soft); color: var(--good); }
.pill.blending { background: var(--good-soft); color: var(--good); }
.pill.protected { background: var(--good-soft); color: var(--good); }

/* ---- 2x2 quadrant ---- */
.quad { position: relative; aspect-ratio: 1; border: 1px solid var(--border); border-radius: 12px;
        background: var(--surface-2); overflow: hidden; }
.quad .axis { position: absolute; background: var(--border); }
.quad .axis.h { left: 0; right: 0; top: 50%; height: 1px; }
.quad .axis.v { top: 0; bottom: 0; left: 50%; width: 1px; }
.quad .ql { position: absolute; font-size: .62rem; color: var(--muted); line-height: 1.25;
            padding: 7px; max-width: 50%; }
.quad .ql.tl { top: 0; left: 0; } .quad .ql.tr { top: 0; right: 0; text-align: right; }
.quad .ql.bl { bottom: 0; left: 0; } .quad .ql.br { bottom: 0; right: 0; text-align: right; }
.quad .dot { position: absolute; width: 15px; height: 15px; border-radius: 50%;
             background: var(--accent); border: 2.5px solid var(--surface);
             transform: translate(-50%, 50%); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);
             transition: left .6s cubic-bezier(.3,.8,.3,1), bottom .6s cubic-bezier(.3,.8,.3,1); }
.quad .axname { position: absolute; font-size: .6rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.quad .axname.x { bottom: 3px; left: 50%; transform: translateX(-50%); }
.quad .axname.y { left: 3px; top: 50%; transform: rotate(-90deg) translateX(0); transform-origin: left center; }

/* ---- score row ---- */
.scores { display: grid; grid-template-columns: repeat(auto-fit, minmax(155px, 1fr)); gap: 1px;
          background: var(--border); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.score { background: var(--surface); padding: 16px 18px; }
.score .k { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.score .v { font-size: 1.5rem; font-weight: 640; letter-spacing: -.02em; margin-top: 3px; font-variant-numeric: tabular-nums; }
.score .n { font-size: .78rem; color: var(--muted); margin-top: 1px; }

/* ---- linkability ---- */
.link-demo { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: 16px 20px; border-radius: 0 10px 10px 0; }
.link-demo.hit { border-color: var(--bad); background: var(--bad-soft); }
.link-demo h3 { margin-bottom: 4px; }
.link-demo p { margin: 0; font-size: .93rem; }

/* ---- groups ---- */
.grp { border: 1px solid var(--border); border-radius: 11px; margin-bottom: 9px; background: var(--surface); overflow: hidden; }
.grp > summary { cursor: pointer; padding: 13px 16px; display: grid;
                 grid-template-columns: 1fr auto auto; gap: 14px; align-items: center; list-style: none; }
.grp > summary::-webkit-details-marker { display: none; }
.grp > summary:hover { background: var(--surface-2); }
.grp .name { font-weight: 550; font-size: .95rem; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tag { font-size: .64rem; text-transform: uppercase; letter-spacing: .05em; padding: 2px 7px;
       border-radius: 4px; background: var(--surface-2); color: var(--muted); font-weight: 600; }
.tag.rand { background: var(--good-soft); color: var(--good); }
.tag.vol { background: var(--warn-soft); color: var(--warn); }
.tag.chg { background: var(--bad-soft); color: var(--bad); }
.bits { font-family: var(--mono); font-size: .87rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.meter { width: 86px; height: 5px; background: var(--surface-2); border-radius: 3px; overflow: hidden; }
.meter > i { display: block; height: 100%; background: var(--accent); }
.grp .body { padding: 4px 16px 16px; border-top: 1px solid var(--border); font-size: .9rem; }
.grp .advice { color: var(--muted); margin: 12px 0 0; padding-top: 12px; border-top: 1px dashed var(--border); }
table.vals { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: .84rem; }
table.vals td { padding: 5px 8px 5px 0; vertical-align: top; border-bottom: 1px solid var(--border); }
table.vals td.k { color: var(--muted); white-space: nowrap; width: 1%; padding-right: 18px; font-family: var(--mono); font-size: .78rem; }
table.vals td.v { font-family: var(--mono); font-size: .78rem; word-break: break-all; }

.note { background: var(--warn-soft); color: var(--warn); border-radius: 9px; padding: 12px 15px;
        font-size: .88rem; margin-bottom: 9px; }
.muted-box { background: var(--surface-2); border-radius: 9px; padding: 14px 16px; font-size: .88rem; color: var(--muted); }
code, .mono { font-family: var(--mono); font-size: .85em; }
footer.site { border-top: 1px solid var(--border); margin-top: 44px; padding: 26px 0 46px;
              color: var(--muted); font-size: .87rem; background: var(--surface); }
footer.site a { color: var(--muted); }
.cta { background: var(--accent-soft); border: 1px solid var(--border); border-radius: 12px; padding: 20px 24px; margin-top: 18px; }
.cta h3 { margin-bottom: 5px; }
.cta p { margin: 0; font-size: .92rem; color: var(--muted); }
.hidden { display: none !important; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.faq h3 { margin-top: 18px; }
.faq p { font-size: .92rem; color: var(--muted); margin: 4px 0 0; }