/* ───────────── Tokens ───────────── */
:root {
  --bg: #0b0d12;
  --bg-2: #10131a;
  --surface: #151924;
  --surface-2: #1b2030;
  --line: #262c3d;
  --line-2: #323a50;
  --text: #e8ebf3;
  --muted: #9aa3b8;
  --faint: #6b7489;
  --accent: #7c8cff;
  --accent-2: #a78bfa;
  --ok: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --c-left: #7c8cff;
  --c-right: #f472b6;
  --c-middle: #fbbf24;
  --c-back: #34d399;
  --c-fwd: #22d3ee;
  --c-wheel: #a78bfa;
  --radius: 18px;
  --shadow: 0 1px 0 rgba(255,255,255,.04) inset, 0 20px 50px -20px rgba(0,0,0,.6);
  --mouse-body: #1c2130;
  --mouse-body-2: #141824;
  --mouse-stroke: #3a4360;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f7fb; --bg-2: #eef0f6; --surface: #ffffff; --surface-2: #f3f5fa;
    --line: #e3e6ef; --line-2: #d3d8e5; --text: #151823; --muted: #535b70; --faint: #8a91a3;
    --accent: #4f5ff0; --accent-2: #7c4ddb; --ok: #0f9f6e; --warn: #c78a00; --bad: #dc3b3b;
    --c-left: #4f5ff0; --c-right: #db2777; --c-middle: #d97706; --c-back: #059669; --c-fwd: #0891b2; --c-wheel: #7c4ddb;
    --shadow: 0 1px 2px rgba(20,24,40,.05), 0 16px 40px -24px rgba(20,24,40,.25);
    --mouse-body: #ffffff; --mouse-body-2: #eef0f6; --mouse-stroke: #c5cbdb;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f6f7fb; --bg-2: #eef0f6; --surface: #ffffff; --surface-2: #f3f5fa;
  --line: #e3e6ef; --line-2: #d3d8e5; --text: #151823; --muted: #535b70; --faint: #8a91a3;
  --accent: #4f5ff0; --accent-2: #7c4ddb; --ok: #0f9f6e; --warn: #c78a00; --bad: #dc3b3b;
  --c-left: #4f5ff0; --c-right: #db2777; --c-middle: #d97706; --c-back: #059669; --c-fwd: #0891b2; --c-wheel: #7c4ddb;
  --shadow: 0 1px 2px rgba(20,24,40,.05), 0 16px 40px -24px rgba(20,24,40,.25);
  --mouse-body: #ffffff; --mouse-body-2: #eef0f6; --mouse-stroke: #c5cbdb;
  color-scheme: light;
}

/* ───────────── Base ───────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body::before { /* soft glow backdrop */
  content: ""; position: fixed; inset: -20vh -10vw auto; height: 70vh; z-index: -1; pointer-events: none;
  background: radial-gradient(40% 60% at 25% 20%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
              radial-gradient(35% 50% at 80% 10%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 70%);
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.02em; margin: 0 0 .5em; }
h2 { font-size: clamp(1.4rem, 1.1rem + 1.2vw, 1.9rem); }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
.wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
kbd { font: 600 .82em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; padding: .1em .45em; border: 1px solid var(--line-2); border-bottom-width: 2px; border-radius: 6px; background: var(--surface-2); }
.mono, .num { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-variant-numeric: tabular-nums; }

/* ───────────── Header ───────────── */
.top { position: sticky; top: 0; z-index: 20; backdrop-filter: saturate(1.4) blur(12px); background: color-mix(in srgb, var(--bg) 78%, transparent); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 750; letter-spacing: -.02em; }
.brand svg { width: 28px; height: 28px; }
.brand span b { color: var(--accent); }
.nav { margin-left: auto; display: flex; gap: 4px; align-items: center; }
.nav a { color: var(--muted); text-decoration: none; font-size: .92rem; padding: 6px 10px; border-radius: 8px; }
.nav a:hover { color: var(--text); background: var(--surface-2); }
.icon-btn { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); cursor: pointer; }
.icon-btn:hover { color: var(--text); border-color: var(--line-2); }
.icon-btn svg { width: 18px; height: 18px; }
@media (max-width: 640px) { .nav a.hide-sm { display: none; } }

/* ───────────── Hero ───────────── */
.hero { padding: 36px 0 18px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: .8rem; font-weight: 600; color: var(--muted); padding: 4px 12px; border: 1px solid var(--line); border-radius: 99px; background: var(--surface); margin-bottom: 14px; }
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 22%, transparent); }
.hero h1 { font-size: clamp(2rem, 1.3rem + 3vw, 3.3rem); font-weight: 800; margin-bottom: 10px; }
.hero h1 .grad { background: linear-gradient(95deg, var(--accent), var(--accent-2) 60%, var(--c-right)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); max-width: 640px; margin: 0 auto; font-size: 1.05rem; }

/* ───────────── Tester ───────────── */
.tester { margin: 22px auto 0; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 18px; }
@media (max-width: 900px) { .tester { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }

.pad {
  position: relative; min-height: 440px; display: grid; place-items: center; padding: 40px 0; overflow: hidden;
  cursor: crosshair; user-select: none; -webkit-user-select: none; touch-action: manipulation; outline: none;
  background:
    radial-gradient(60% 60% at 50% 45%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 70%),
    repeating-linear-gradient(0deg, transparent 0 31px, color-mix(in srgb, var(--line) 55%, transparent) 31px 32px),
    repeating-linear-gradient(90deg, transparent 0 31px, color-mix(in srgb, var(--line) 55%, transparent) 31px 32px),
    var(--surface);
}
.pad:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 50%, transparent); }
.pad.armed { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.pad-hint { position: absolute; top: 14px; left: 0; right: 0; text-align: center; font-size: .85rem; color: var(--faint); pointer-events: none; transition: opacity .3s; }
.pad.armed .pad-hint { opacity: 0; }
.pad-foot { position: absolute; bottom: 12px; left: 14px; right: 14px; display: flex; justify-content: space-between; gap: 8px; font-size: .78rem; color: var(--faint); pointer-events: none; }
.ripple { position: absolute; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; border: 2px solid currentColor; pointer-events: none; animation: ripple .55s ease-out forwards; }
@keyframes ripple { to { transform: scale(5); opacity: 0; } }

/* Mouse SVG */
.mouse { width: min(280px, 62vw); height: auto; overflow: visible; filter: drop-shadow(0 30px 40px rgba(0,0,0,.35)); }
.mouse .body { fill: url(#mBody); stroke: var(--mouse-stroke); stroke-width: 2; }
.mouse .btn { fill: var(--mouse-body); stroke: var(--mouse-stroke); stroke-width: 2; transition: fill .25s, filter .25s; }
.mouse .btn.tested { fill: color-mix(in srgb, var(--c) 16%, var(--mouse-body)); }
.mouse .btn.down { fill: var(--c); filter: drop-shadow(0 0 14px var(--c)); transition: none; }
.mouse .btn.fault { fill: color-mix(in srgb, var(--bad) 30%, var(--mouse-body)); stroke: var(--bad); }
.mouse .btn.fault.down { fill: var(--bad); }
.mouse .lbl { font: 700 11px ui-sans-serif, system-ui, sans-serif; fill: var(--faint); pointer-events: none; text-anchor: middle; letter-spacing: .06em; }
.mouse .wheel-arrow { fill: var(--c-wheel); opacity: 0; transition: opacity .35s; }
.mouse .wheel-arrow.on { opacity: 1; transition: none; }
.mouse .wheel-ridges line { stroke: var(--mouse-stroke); stroke-width: 2; stroke-linecap: round; }
.mouse .led { fill: var(--accent); opacity: .5; }
.b-left { --c: var(--c-left); } .b-right { --c: var(--c-right); } .b-middle { --c: var(--c-middle); }
.b-back { --c: var(--c-back); } .b-fwd { --c: var(--c-fwd); }

/* Dashboard */
.dash { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.dash-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.dash-head h2 { font-size: 1.05rem; margin: 0; }
.tools { display: flex; gap: 8px; align-items: center; }
.btn-ui { display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text); font: 600 .85rem inherit; font-family: inherit; cursor: pointer; }
.btn-ui:hover { border-color: var(--line-2); }
.btn-ui.primary { background: var(--accent); border-color: transparent; color: #fff; }
.btn-ui svg { width: 15px; height: 15px; }
.btn-ui[aria-pressed="false"] { color: var(--faint); }

.verdict { display: flex; gap: 12px; align-items: center; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface-2); }
.verdict .dot { flex: none; width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; background: color-mix(in srgb, var(--vc, var(--faint)) 18%, transparent); color: var(--vc, var(--faint)); }
.verdict .dot svg { width: 20px; height: 20px; }
.verdict b { display: block; font-size: .95rem; }
.verdict span { font-size: .84rem; color: var(--muted); }
.verdict[data-state="ok"] { --vc: var(--ok); }
.verdict[data-state="warn"] { --vc: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, var(--line)); }
.verdict[data-state="bad"] { --vc: var(--bad); border-color: color-mix(in srgb, var(--bad) 45%, var(--line)); }

.btn-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
@media (max-width: 520px) { .btn-grid { grid-template-columns: repeat(3, 1fr); } }
.bstat { --c: var(--faint); position: relative; padding: 10px 10px 9px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); overflow: hidden; transition: border-color .2s, transform .08s; }
.bstat::before { content: ""; position: absolute; inset: 0 0 auto; height: 3px; background: var(--c); opacity: .35; transition: opacity .2s; }
.bstat.tested::before { opacity: 1; }
.bstat.down { border-color: var(--c); transform: translateY(1px); }
.bstat.fault { border-color: color-mix(in srgb, var(--bad) 60%, var(--line)); }
.bstat .k { font-size: .72rem; font-weight: 650; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; white-space: nowrap; }
.bstat .v { font-size: 1.6rem; font-weight: 750; line-height: 1.2; }
.bstat .s { font-size: .72rem; color: var(--faint); white-space: nowrap; }
.bstat .s.bad { color: var(--bad); font-weight: 650; }
.bstat.b-left { --c: var(--c-left); } .bstat.b-right { --c: var(--c-right); } .bstat.b-middle { --c: var(--c-middle); }
.bstat.b-back { --c: var(--c-back); } .bstat.b-fwd { --c: var(--c-fwd); }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
@media (max-width: 520px) { .metrics { grid-template-columns: repeat(2, 1fr); } }
.metric { padding: 9px 11px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); }
.metric .k { font-size: .72rem; color: var(--muted); }
.metric .v { font-size: 1.15rem; font-weight: 700; }
.metric .v small { font-size: .7em; color: var(--faint); font-weight: 600; margin-left: 2px; }

.timeline-wrap { border-radius: 12px; border: 1px solid var(--line); background: var(--bg-2); overflow: hidden; }
.timeline-head { display: flex; justify-content: space-between; align-items: center; padding: 7px 11px; font-size: .74rem; color: var(--muted); border-bottom: 1px solid var(--line); }
.legend { display: flex; gap: 10px; flex-wrap: wrap; }
.legend i { display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 4px; vertical-align: 0; }
#timeline { display: block; width: 100%; height: 132px; }

.settings { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: .84rem; color: var(--muted); }
.settings input[type=range] { accent-color: var(--accent); width: 130px; }
.settings output { color: var(--text); font-weight: 650; min-width: 44px; }

.log { list-style: none; margin: 0; padding: 0; max-height: 168px; overflow: auto; font-size: .8rem; border-radius: 12px; border: 1px solid var(--line); background: var(--bg-2); }
.log li { display: grid; grid-template-columns: 62px 1fr auto; gap: 10px; padding: 5px 11px; border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent); }
.log li:last-child { border-bottom: 0; }
.log li .t { color: var(--faint); }
.log li .e b { color: var(--c, var(--text)); }
.log li .d { color: var(--muted); }
.log li.bad { background: color-mix(in srgb, var(--bad) 10%, transparent); }
.log li.bad .d { color: var(--bad); font-weight: 650; }
.log .empty { display: block; color: var(--faint); text-align: center; padding: 14px; }

/* ───────────── Ads ───────────── */
.ad { display: none; margin: 28px auto; text-align: center; }
.ads-on .ad { display: block; }
.ad::before { content: "Advertisement"; display: block; font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); margin-bottom: 6px; }
.ad ins { display: block; min-height: 100px; }
.ad-side ins { min-height: 600px; }

/* ───────────── Content ───────────── */
.content { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 40px; margin-top: 44px; align-items: start; }
.content.no-side { grid-template-columns: minmax(0, 1fr); max-width: 820px; margin-inline: auto; }
@media (max-width: 1000px) { .content { grid-template-columns: minmax(0, 1fr); } .side { display: none; } }
.side { position: sticky; top: 80px; }
.side .ad { margin-top: 0; }
article section { margin-bottom: 48px; scroll-margin-top: 80px; }
article p, article li { color: color-mix(in srgb, var(--text) 86%, var(--muted)); }
article ul, article ol { padding-left: 1.25em; margin: 0 0 1em; }
article li { margin-bottom: .35em; }
.lead { font-size: 1.08rem; color: var(--muted) !important; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: s; margin-top: 18px; }
@media (max-width: 720px) { .steps { grid-template-columns: 1fr; } }
.step { padding: 18px; counter-increment: s; }
.step::before { content: counter(s); display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; font-weight: 800; font-size: .9rem; color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-2)); margin-bottom: 10px; }
.step h3 { margin-bottom: .3em; }
.step p { margin: 0; font-size: .93rem; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 18px; }
@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }
.tile { padding: 18px; }
.tile .ic { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 10px; background: color-mix(in srgb, var(--tc, var(--accent)) 16%, transparent); color: var(--tc, var(--accent)); }
.tile .ic svg { width: 18px; height: 18px; }
.tile p { margin: 0; font-size: .93rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; margin: 16px 0; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--surface-2); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
tr:last-child td { border-bottom: 0; }
td code, p code, li code { font: .88em ui-monospace, Menlo, Consolas, monospace; background: var(--surface-2); padding: .1em .35em; border-radius: 5px; border: 1px solid var(--line); }

.callout { padding: 14px 16px; border-radius: 14px; border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line)); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); font-size: .95rem; margin: 16px 0; }
.callout p:last-child { margin: 0; }

.faq details { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); margin-bottom: 10px; }
.faq summary { cursor: pointer; list-style: none; padding: 14px 44px 14px 16px; font-weight: 650; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 18px; top: 50%; width: 9px; height: 9px; border: solid var(--muted); border-width: 0 2px 2px 0; transform: translateY(-70%) rotate(45deg); transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq details > div { padding: 0 16px 14px; }
.faq details > div p:last-child { margin: 0; }

.toc { padding: 16px 18px; margin-bottom: 18px; }
.toc b { display: block; font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 1.1em; font-size: .9rem; }
.toc li { margin-bottom: 4px; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

/* ───────────── Footer ───────────── */
footer { margin-top: 40px; border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: .88rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; align-items: center; }
footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* Legal / simple pages */
.page { padding: 40px 0 10px; }
.page h1 { font-size: clamp(1.8rem, 1.3rem + 2vw, 2.6rem); }
.page .updated { color: var(--faint); font-size: .88rem; }

@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }

/* Full-width signal row under the tester */
.scope { grid-column: 1 / -1; padding: 14px; display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 14px; }
@media (max-width: 900px) { .scope { grid-template-columns: 1fr; } }
.log-wrap { border-radius: 12px; border: 1px solid var(--line); background: var(--bg-2); overflow: hidden; display: flex; flex-direction: column; }
.log-wrap .log { border: 0; border-radius: 0; background: none; flex: 1; max-height: 150px; }
.scope #timeline { height: 150px; }

/* ───────────── Tool tabs (header row 2) ───────────── */
.top #themeToggle { margin-left: auto; }
.top .wrap { height: 56px; }
.tabs { border-top: 1px solid var(--line); }
.tabs .wrap { height: auto; display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; padding: 6px 0; }
.tabs .wrap::-webkit-scrollbar { display: none; }
.tabs a { --c: var(--accent); flex: none; display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px; border-radius: 9px; font-size: .88rem; font-weight: 600; color: var(--muted); text-decoration: none; white-space: nowrap; }
.tabs a svg { width: 16px; height: 16px; color: var(--c); }
.tabs a:hover { color: var(--text); background: var(--surface-2); }
.tabs a[aria-current="page"] { color: var(--text); background: color-mix(in srgb, var(--c) 16%, var(--surface)); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--c) 40%, transparent); }
.side { top: 120px; }
article section, .more-tools { scroll-margin-top: 120px; }

/* ───────────── More tools ───────────── */
.more-tools { margin: 56px 0 10px; }
.tool-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
@media (max-width: 900px) { .tool-cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .tool-cards { grid-template-columns: 1fr; } }
.tool-card { display: flex; flex-direction: column; gap: 4px; padding: 16px; text-decoration: none; color: var(--text); transition: transform .15s, border-color .15s; }
.tool-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--c) 55%, var(--line)); }
.tool-card .ic { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 6px; color: var(--c); background: color-mix(in srgb, var(--c) 16%, transparent); }
.tool-card .ic svg { width: 19px; height: 19px; }
.tool-card span:last-child { font-size: .87rem; color: var(--muted); }

/* ───────────── Shared tester parts ───────────── */
.tool { margin-top: 22px; padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.tool-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; }
.seg { display: inline-flex; padding: 3px; gap: 2px; border-radius: 11px; background: var(--surface-2); border: 1px solid var(--line); flex-wrap: wrap; }
.seg button { border: 0; background: none; color: var(--muted); font: 600 .85rem/1 inherit; font-family: inherit; padding: 8px 12px; border-radius: 8px; cursor: pointer; }
.seg button:hover { color: var(--text); }
.seg button[aria-pressed="true"] { background: var(--accent); color: #fff; }
.zone {
  position: relative; min-height: 340px; border-radius: 16px; border: 1px dashed var(--line-2); display: grid; place-items: center; text-align: center;
  cursor: pointer; user-select: none; -webkit-user-select: none; touch-action: manipulation; overflow: hidden; outline: none;
  background: radial-gradient(60% 70% at 50% 50%, color-mix(in srgb, var(--zc, var(--accent)) 10%, transparent), transparent 75%), var(--bg-2);
  transition: border-color .2s, background-color .2s;
}
.zone:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 45%, transparent); }
.zone.live { border-style: solid; border-color: color-mix(in srgb, var(--zc, var(--accent)) 55%, var(--line)); }
.zone .big { font-size: clamp(3rem, 2rem + 5vw, 5.5rem); font-weight: 800; line-height: 1; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.zone .sub { color: var(--muted); font-size: .95rem; margin-top: 8px; }
.zone .hint { color: var(--faint); font-size: .85rem; margin-top: 4px; }
.zone .progress { position: absolute; left: 0; bottom: 0; height: 4px; width: 0; background: var(--zc, var(--accent)); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(112px, 1fr)); gap: 8px; }
.stat { padding: 11px 13px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); }
.stat .k { font-size: .74rem; color: var(--muted); }
.stat .v { font-size: 1.4rem; font-weight: 750; font-variant-numeric: tabular-nums; }
.stat .v small { font-size: .62em; color: var(--faint); font-weight: 600; margin-left: 3px; }
.stat.hl { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); background: color-mix(in srgb, var(--accent) 8%, var(--surface-2)); }
.stat.bad .v { color: var(--bad); }
.chart { border-radius: 12px; border: 1px solid var(--line); background: var(--bg-2); overflow: hidden; }
.chart canvas { display: block; width: 100%; height: 170px; }
.result { display: none; gap: 16px; align-items: center; padding: 16px 18px; border-radius: 14px; border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--line)); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }
.result.show { display: flex; }
.result .badge { flex: none; width: 64px; height: 64px; border-radius: 18px; display: grid; place-items: center; font-size: 2rem; background: color-mix(in srgb, var(--accent) 18%, transparent); }
.result b { font-size: 1.15rem; display: block; }
.result span { color: var(--muted); font-size: .92rem; }
@media (max-width: 520px) { .result { flex-direction: column; text-align: center; } }

/* Double-click folder */
.folder { width: 120px; height: 96px; overflow: visible; }
.folder .f-back { fill: color-mix(in srgb, var(--c-middle) 70%, #7a4a00); }
.folder .f-paper { fill: var(--surface); stroke: var(--line-2); transition: transform .3s; }
.folder .f-front { fill: var(--c-middle); transform-origin: 60px 90px; transition: transform .3s; }
.folder.open .f-front { animation: fOpen .7s ease; }
.folder.open .f-paper { animation: fPaper .7s ease; }
.folder.shake { animation: fShake .45s ease; }
.folder.shake .f-front { fill: var(--bad); transition: none; }
@keyframes fOpen { 30% { transform: perspective(300px) rotateX(38deg) scaleY(.85); } 100% { transform: none; } }
@keyframes fPaper { 30% { transform: translateY(-14px); } 100% { transform: none; } }
@keyframes fShake { 20%, 60% { transform: translateX(-8px); } 40%, 80% { transform: translateX(8px); } }

/* Scroll test ruler */
.scroll-zone { cursor: ns-resize; }
.ruler { position: absolute; inset: 0; pointer-events: none; opacity: .7;
  background-image: repeating-linear-gradient(180deg, color-mix(in srgb, var(--c-wheel) 55%, transparent) 0 2px, transparent 2px 24px),
                    repeating-linear-gradient(180deg, color-mix(in srgb, var(--c-wheel) 25%, transparent) 0 1px, transparent 1px 8px);
  background-size: 100% 96px, 100% 96px;
  -webkit-mask: linear-gradient(90deg, #000 0 56px, transparent 110px calc(100% - 110px), #000 calc(100% - 56px));
          mask: linear-gradient(90deg, #000 0 56px, transparent 110px calc(100% - 110px), #000 calc(100% - 56px));
  transition: background-position .12s ease-out; }