/* Simply Blur Detector: a darkroom bench with a camera viewfinder. Light theme = lightbox. */
:root {
  color-scheme: dark;
  --bg: #0d0e11;
  --bg-2: #121418;
  --panel: #15171c;
  --panel-2: #1b1e24;
  --line: #2a2e36;
  --line-soft: #20232a;
  --ink: #ece9e2;
  --ink-2: #b9b6ae;
  --muted: #858993;
  --accent: #c9f24b;          /* UI accent: focus-peaking lime */
  --accent-ink: #0d0e11;
  --cnn: #7f9f18;             /* data series, validated against --panel */
  --lap: #8e6ff0;
  --heat-sharp: #1ea8ac;      /* blur meaning: sharp ... blurry, validated in both themes */
  --heat-blurry: #e8492c;
  --heat-mid: #6b6f78;
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset, 0 20px 60px rgba(0, 0, 0, .45);
  --radius: 14px;
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "Instrument Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
}
@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f3f0e8;
    --bg-2: #ebe7dd;
    --panel: #fffdf8;
    --panel-2: #f6f3ec;
    --line: #d9d3c6;
    --line-soft: #e6e1d6;
    --ink: #16181d;
    --ink-2: #3d4048;
    --muted: #6b6e76;
    --accent: #4f6b00;
    --accent-ink: #fffdf8;
    --cnn: #5d7a00;
    --lap: #6d4ed6;
    --heat-mid: #a8a59d;
    --shadow: 0 1px 2px rgba(22, 24, 29, .06), 0 18px 40px rgba(22, 24, 29, .08);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 85% -10%, color-mix(in oklab, var(--accent) 9%, transparent), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, color-mix(in oklab, var(--lap) 8%, transparent), transparent 60%),
    var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
  padding: 0 clamp(16px, 4vw, 48px);
  min-height: 100vh;
}
.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 100; opacity: .07; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
a { color: inherit; text-decoration-color: color-mix(in oklab, var(--accent) 70%, transparent); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
code { font: 0.86em var(--mono); color: var(--ink-2); }
.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }

/* ---------- header ---------- */
.top {
  max-width: 1240px; margin: 0 auto; padding: 22px 0 8px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 600 15px var(--mono); letter-spacing: -.01em; }
.aperture { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; }
.brand:hover .aperture { animation: spin 1.6s cubic-bezier(.6, 0, .2, 1); }
@keyframes spin { to { transform: rotate(360deg); } }
.top nav { display: flex; gap: 22px; font: 500 14px var(--sans); }
.top nav a { text-decoration: none; color: var(--ink-2); }
.top nav a:hover { color: var(--accent); }

/* ---------- hero ---------- */
main { max-width: 1240px; margin: 0 auto; }
.hero { padding: 26px 0 30px; }
.intro { max-width: 760px; animation: rise .7s ease-out both; }
.kicker { font: 500 12.5px var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 6px; }
.kicker span { color: var(--accent); }
h1 { font: 400 clamp(52px, 8.5vw, 112px)/.95 var(--serif); letter-spacing: -.02em; margin: 0 0 14px; }
.defocus { font-style: italic; color: var(--accent); display: inline-block; animation: breathe 5.5s ease-in-out infinite; }
@keyframes breathe { 0%, 100% { filter: blur(0); } 45%, 60% { filter: blur(4px); } }
@media (prefers-reduced-motion: reduce) { .defocus, .brand:hover .aperture { animation: none; } }
.lede { font-size: 18px; color: var(--ink-2); max-width: 640px; margin: 0; }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.lab {
  margin-top: 30px; display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 22px; align-items: start;
  animation: rise .8s .12s ease-out both;
}
@media (max-width: 960px) { .lab { grid-template-columns: 1fr; } }

/* ---------- the viewfinder ---------- */
.viewer { margin: 0; min-width: 0; }
.caption {
  margin: 10px 4px 0; font: 500 12.5px var(--mono); color: var(--muted); text-align: center;
  overflow-wrap: anywhere;
}
.caption .notice { color: var(--ink-2); }
.stage {
  position: relative; border-radius: var(--radius); overflow: hidden; background: #050506;
  min-height: 300px; aspect-ratio: 4 / 3; box-shadow: var(--shadow); outline: none;
  border: 1px solid var(--line);
}
.stage:focus-visible { border-color: var(--accent); }
.stage.dragging { border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 25%, transparent), var(--shadow); }
.stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
#overlay { mix-blend-mode: normal; transition: opacity .25s; }
.corner { position: absolute; width: 26px; height: 26px; border: 2px solid rgba(255, 255, 255, .7); pointer-events: none; }
.corner.tl { top: 14px; left: 14px; border-right: 0; border-bottom: 0; }
.corner.tr { top: 14px; right: 14px; border-left: 0; border-bottom: 0; }
.corner.bl { bottom: 14px; left: 14px; border-right: 0; border-top: 0; }
.corner.br { bottom: 14px; right: 14px; border-left: 0; border-top: 0; }
.hud {
  position: absolute; font: 500 12px var(--mono); color: #f2f0ea; letter-spacing: .02em;
  background: rgba(8, 9, 11, .62); backdrop-filter: blur(6px); padding: 5px 9px; border-radius: 7px;
  pointer-events: none; max-width: calc(100% - 100px); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.hud.top-left { top: 20px; left: 50px; }
.hud.bottom-left { bottom: 20px; left: 50px; }
.hud .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); margin-right: 7px; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: .2; } }
.reticle {
  position: absolute; left: 0; top: 0; border: 1.5px solid #c9f24b; border-radius: 6px; pointer-events: none;
  transition: transform .22s cubic-bezier(.3, .7, .2, 1), width .22s, height .22s;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, .35), 0 0 24px rgba(201, 242, 75, .35);
}
.reticle span { position: absolute; left: 50%; top: 50%; width: 18px; height: 18px; transform: translate(-50%, -50%); }
.reticle span::before, .reticle span::after { content: ""; position: absolute; background: #c9f24b; }
.reticle span::before { left: 8px; top: 0; width: 2px; height: 18px; }
.reticle span::after { top: 8px; left: 0; width: 18px; height: 2px; }
.drop {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 4px; color: #e9e7e0;
  background: radial-gradient(closest-side, rgba(13, 14, 17, .55), rgba(13, 14, 17, .88));
}
.drop p { margin: 0; }
.drop strong { font: 400 34px var(--serif); }

/* ---------- buttons, segmented controls ---------- */
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; cursor: pointer;
  font: 600 14px var(--sans); color: var(--ink); background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 999px; padding: 8px 16px; margin-top: 10px; transition: border-color .15s, transform .15s;
}
.button:hover { border-color: var(--accent); }
.button:active { transform: translateY(1px); }
.button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); margin: 0; }
.button:disabled { opacity: .45; cursor: not-allowed; }
.button input[type=file] { display: none; }
.seg { display: inline-flex; padding: 3px; border-radius: 999px; background: var(--bg-2); border: 1px solid var(--line-soft); }
.seg label { position: relative; cursor: pointer; }
.seg input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.seg span { display: block; padding: 5px 12px; border-radius: 999px; font: 500 13px var(--sans); color: var(--ink-2); transition: background .15s, color .15s; }
.seg input:checked + span { background: var(--panel); color: var(--ink); box-shadow: 0 1px 3px rgba(0, 0, 0, .25); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ---------- readout ---------- */
.readout { display: grid; gap: 14px; }
.meter, .controls, .card, .chart {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.meter { padding: 14px 16px 12px; }
.meter-head { font: 600 13px var(--mono); letter-spacing: .04em; display: flex; align-items: center; gap: 8px; }
.swatch { display: inline-block; width: 18px; height: 3px; border-radius: 2px; }
.swatch.cnn { background: var(--cnn); }
.swatch.lap { background: var(--lap); }
.dial { width: 100%; height: auto; display: block; margin: 4px 0 -4px; }
.dial-track { fill: none; stroke: var(--line-soft); stroke-width: 12; stroke-linecap: round; }
.dial-fill { fill: none; stroke: url(#dial-grad); stroke-width: 12; stroke-linecap: round; opacity: .9; }
.heat-sharp-stop { stop-color: var(--heat-sharp); }
.heat-mid-stop { stop-color: var(--heat-mid); }
.heat-blurry-stop { stop-color: var(--heat-blurry); }
.ticks line { stroke: var(--muted); stroke-width: 1.5; }
.ticks text { fill: var(--muted); font: 500 9px var(--mono); text-anchor: middle; }
.needle { stroke: var(--ink); stroke-width: 3; stroke-linecap: round; transform-origin: 100px 100px; transition: transform .8s cubic-bezier(.3, 1.5, .4, 1); }
.hub { fill: var(--ink); }
.reading { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.value { font: 500 30px/1 var(--mono); letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.verdict { font: 600 12px var(--mono); letter-spacing: .12em; text-transform: uppercase; padding: 3px 8px; border-radius: 6px; border: 1px solid var(--line); }
.verdict[data-state=sharp] { color: var(--ink); border-color: var(--heat-sharp); box-shadow: inset 3px 0 0 var(--heat-sharp); }
.verdict[data-state=blurry] { color: var(--ink); border-color: var(--heat-blurry); box-shadow: inset 3px 0 0 var(--heat-blurry); }
.logbar { position: relative; margin: 16px 2px 8px; height: 34px; }
.logbar-track {
  position: absolute; left: 0; right: 0; top: 6px; height: 10px; border-radius: 6px;
  background: linear-gradient(90deg, var(--heat-blurry), var(--heat-mid) 50%, var(--heat-sharp));
  opacity: .85;
}
.logbar-threshold { position: absolute; top: 0; width: 2px; height: 22px; background: var(--ink); margin-left: -1px; transition: left .2s; }
.logbar-threshold::after { content: "threshold"; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); font: 500 9px var(--mono); color: var(--muted); white-space: nowrap; }
.logbar-pin { position: absolute; top: 2px; width: 18px; height: 18px; margin-left: -9px; border-radius: 50%; background: var(--panel); border: 3px solid var(--ink); transition: left .8s cubic-bezier(.3, 1.4, .4, 1); left: 0; opacity: 0; }
.logbar-pin.on { opacity: 1; }
.logbar-scale { position: absolute; left: 0; right: 0; bottom: 0; display: flex; justify-content: space-between; font: 500 9.5px var(--mono); color: var(--muted); }
.agreement { margin: 0; padding: 10px 14px; border-radius: 10px; font: 500 14px var(--sans); background: var(--bg-2); border: 1px dashed var(--line); min-height: 44px; }
.agreement b { font-weight: 700; }
.controls { margin: 0; padding: 12px 16px; display: grid; gap: 10px; }
.controls .row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.controls .label { font: 500 12px var(--mono); color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }
.controls input[type=range] { flex: 1; accent-color: var(--accent); max-width: 160px; }
.controls output { font: 500 12px var(--mono); min-width: 40px; text-align: right; }
.legend { display: flex; align-items: center; gap: 8px; font: 500 11px var(--mono); color: var(--muted); }
.legend i { flex: 1; height: 8px; border-radius: 4px; background: linear-gradient(90deg, var(--heat-sharp), transparent 50%, var(--heat-blurry)), repeating-conic-gradient(var(--line) 0 25%, transparent 0 50%) 0 0 / 8px 8px; }

/* ---------- samples ---------- */
.samples { margin-top: 18px; display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; animation: rise .8s .2s ease-out both; }
.sample {
  display: grid; grid-template-columns: 64px 1fr; gap: 10px; align-items: center; text-align: left; cursor: pointer;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 7px; color: var(--ink);
  font: inherit; transition: border-color .15s, transform .15s;
}
.sample:hover { border-color: var(--accent); transform: translateY(-1px); }
.sample[aria-pressed=true] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.sample.own { border-style: dashed; }
.sample .plus { width: 64px; height: 48px; display: grid; place-items: center; border-radius: 7px; background: var(--bg-2); font: 300 28px var(--sans); color: var(--accent); }
.sample img { width: 64px; height: 48px; object-fit: cover; border-radius: 7px; display: block; }
.sample b { display: block; font: 600 14px var(--sans); }
.sample small { display: block; color: var(--muted); font-size: 12px; line-height: 1.3; }

/* ---------- sections ---------- */
section.stress, section.how { padding: 56px 0 10px; border-top: 1px solid var(--line-soft); margin-top: 26px; }
.section-head { display: grid; grid-template-columns: minmax(200px, 340px) 1fr; gap: 28px; align-items: end; margin-bottom: 22px; }
@media (max-width: 760px) { .section-head { grid-template-columns: 1fr; gap: 6px; } }
h2 { font: 400 clamp(40px, 5vw, 60px)/1 var(--serif); margin: 0; letter-spacing: -.01em; }
.section-head p { margin: 0; color: var(--ink-2); max-width: 640px; }
h3 { font: 600 17px var(--sans); margin: 0 0 6px; display: flex; align-items: center; gap: 10px; }

.stress-controls { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.chart { position: relative; margin: 0; padding: 14px 16px 10px; }
.chart svg { width: 100%; height: 280px; display: block; overflow: visible; }
.chart-empty { position: absolute; left: 0; right: 0; top: 45%; text-align: center; margin: 0; color: var(--muted); font: 400 22px var(--serif); }
.chart figcaption { font-size: 12.5px; margin-top: 4px; }
.chart-legend { display: flex; gap: 18px; font: 500 12.5px var(--mono); color: var(--ink-2); }
.chart-legend span { display: inline-flex; align-items: center; gap: 8px; }
.axis line, .grid line { stroke: var(--line-soft); }
.axis text { fill: var(--muted); font: 500 11px var(--mono); }
.axis .title { fill: var(--muted); font: 500 11px var(--mono); }
.mid-line { stroke: var(--muted); stroke-dasharray: 3 5; }
.series { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.series.cnn { stroke: var(--cnn); }
.series.lap { stroke: var(--lap); stroke-dasharray: 7 5; }
.marker { stroke: var(--panel); stroke-width: 2; }
.marker.cnn { fill: var(--cnn); }
.marker.lap { fill: var(--lap); }
.direct { font: 600 11.5px var(--mono); fill: var(--ink-2); }
.crosshair { stroke: var(--muted); stroke-width: 1; }
.hit { fill: transparent; cursor: crosshair; }
.tooltip {
  position: absolute; pointer-events: none; background: var(--panel-2); border: 1px solid var(--line); border-radius: 9px;
  padding: 8px 10px; font: 500 12px var(--mono); box-shadow: var(--shadow); min-width: 150px; z-index: 5;
}
.tooltip div { display: flex; align-items: center; gap: 8px; justify-content: space-between; }
.tooltip .k { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-2); }
.strip { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 8px; margin-top: 12px; }
.strip figure { margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.strip canvas { display: block; width: 100%; height: auto; }
.strip figcaption { font: 500 11px var(--mono); padding: 5px 7px; color: var(--ink-2); }
.strip figcaption span { display: block; }
.table-view { margin-top: 10px; font-size: 13px; }
.table-view summary { cursor: pointer; color: var(--muted); }
.table-view table { border-collapse: collapse; margin-top: 8px; font: 500 12.5px var(--mono); }
.table-view th, .table-view td { border-bottom: 1px solid var(--line-soft); padding: 5px 14px 5px 0; text-align: right; }
.table-view th:first-child, .table-view td:first-child { text-align: left; }

.pipeline { list-style: none; padding: 0; margin: 0 0 24px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; counter-reset: step; }
@media (max-width: 900px) { .pipeline { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .pipeline { grid-template-columns: 1fr; } }
.pipeline li { position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 14px 14px; counter-increment: step; }
.pipeline li::before { content: "0" counter(step); font: 500 11px var(--mono); color: var(--accent); display: block; margin-bottom: 6px; }
.pipeline b { display: block; font: 600 15px var(--sans); margin-bottom: 3px; }
.pipeline span { color: var(--muted); font-size: 13px; line-height: 1.4; display: block; }
.explain { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; margin-bottom: 22px; }
@media (max-width: 760px) { .explain { grid-template-columns: 1fr; } }
.explain p { color: var(--ink-2); margin: 0; }
.card { padding: 16px 18px; }
.card dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 8px 0 0; font: 500 13px var(--mono); }
.card dt { color: var(--muted); }
.card dd { margin: 0; overflow-wrap: anywhere; }
.fine-print { color: var(--muted); font-size: 13.5px; max-width: 780px; }
.bottom { max-width: 1240px; margin: 40px auto 0; padding: 18px 0 30px; border-top: 1px solid var(--line-soft); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; }