/* Lensless - browser ML demos */
:root {
  --bg: #0a0d12;
  --bg-2: #0e1219;
  --surface: #131821;
  --surface-2: #1b2230;
  --line: #232a3a;
  --line-soft: #1a2030;

  --text: #ecedf0;
  --text-mid: #b6bbc7;
  --text-dim: #7c8493;
  --inverse: #0a0d12;

  --accent: #7dd3fc;
  --accent-2: #f0abfc;
  --success: #6ee7a0;
  --warn: #f5b56a;
  --danger: #ff7a8a;

  --focus: #ffffff;

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Fraunces", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 1040px;
  --gutter: clamp(20px, 4vw, 56px);
  --t-fast: 150ms;
  --t-mid: 280ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { color-scheme: dark; }
body {
  font-family: var(--font-sans);
  font-size: 16px; line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(900px 400px at 70% -10%, rgba(125,211,252,0.07), transparent 70%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 16px; top: -40px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--line);
  padding: 10px 16px; border-radius: 8px;
  z-index: 100; font-weight: 600;
  transition: top var(--t-fast) var(--ease-out);
}
.skip-link:focus { top: 12px; }
main:focus { outline: none; }
section[id] { scroll-margin-top: 80px; }

/* TOPBAR */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex; align-items: center; gap: 16px;
}
.mark {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none; font-weight: 700;
}
.mark:hover { color: var(--accent); }
.mark-glyph {
  width: 22px; height: 22px; border-radius: 6px;
  background:
    radial-gradient(circle at 30% 30%, var(--accent) 0 30%, transparent 31%),
    radial-gradient(circle at 65% 65%, var(--accent-2) 0 25%, transparent 26%),
    var(--surface-2);
  border: 1px solid var(--line);
}
.mark-text { font-family: var(--font-display); font-size: 18px; letter-spacing: -0.01em; }
.topbar-meta { margin: 0 0 0 auto; color: var(--text-dim); font-family: var(--font-mono); font-size: 12px; }

/* HERO */
.hero {
  position: relative;
  padding: 100px var(--gutter) 60px;
  max-width: var(--maxw); margin: 0 auto;
  isolation: isolate;
}
.hero-grid {
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, black 30%, transparent 75%);
  opacity: 0.5;
}
.kicker {
  font-family: var(--font-mono); font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--text-dim);
  margin: 0 0 20px;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--text);
  margin: 0 0 24px;
  max-width: 18ch;
}
.hero h1::after {
  content: "."; color: var(--accent);
}
.hero-lede {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.5;
  color: var(--text-mid);
  max-width: 56ch;
  margin: 0 0 16px;
}
.hero-meta {
  font-family: var(--font-mono);
  font-size: 13px; color: var(--text-dim);
  margin: 0 0 32px;
  max-width: 60ch;
}
.cta {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px; min-height: 48px;
  background: var(--accent); color: var(--inverse);
  font-weight: 700; text-decoration: none;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(125,211,252,0.4), 0 14px 40px -10px rgba(125,211,252,0.35);
  transition: transform var(--t-fast) var(--ease-out), background var(--t-fast);
}
.cta:hover { transform: translateY(-2px); background: #a5e0ff; }
.cta::after { content: "→"; font-weight: 400; }

/* SECTIONS */
.demos, .how {
  max-width: var(--maxw); margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 1px solid var(--line);
}
.section-h {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.section-sub {
  color: var(--text-mid);
  margin: 0 0 28px;
  max-width: 60ch;
}

/* TABS */
.tablist {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 4px;
}
.tab {
  padding: 10px 16px; min-height: 40px;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  color: var(--text-mid);
  font-weight: 600;
  font-size: 14px;
  position: relative;
}
.tab:hover { color: var(--text); background: var(--surface-2); }
.tab[aria-selected="true"] {
  color: var(--accent);
  background: var(--surface);
  border-color: var(--line);
}
.tab[aria-selected="true"]::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -5px;
  height: 2px; background: var(--accent);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0 12px 12px 12px;
  padding: 24px;
}
.panel[hidden] { display: none; }
.panel:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.panel-head {
  margin: 0 0 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}
.panel-head h3 {
  margin: 0 0 4px;
  font-family: var(--font-display); font-weight: 700;
  font-size: 24px; letter-spacing: -0.01em;
}
.panel-model {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim); margin: 0;
}
.panel-model code {
  font-family: var(--font-mono);
  color: var(--accent); background: var(--surface-2);
  padding: 2px 6px; border-radius: 4px;
}

/* NOTICE */
.notice {
  background: linear-gradient(180deg, color-mix(in oklab, var(--warn) 12%, var(--surface)), var(--surface));
  border: 1px solid color-mix(in oklab, var(--warn) 40%, var(--line));
  border-left: 3px solid var(--warn);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 18px;
  font-size: 14px;
  color: var(--text);
}
.notice p { margin: 0; }
.notice strong { color: var(--warn); }

/* UPLOAD */
.upload-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 18px;
}
@media (max-width: 720px) { .upload-row { grid-template-columns: 1fr; } .or { text-align: center; } }

.file-zone {
  display: flex; flex-direction: column; align-items: center;
  gap: 6px;
  padding: 22px 18px;
  background: var(--bg-2);
  border: 1px dashed var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
  text-align: center;
}
.file-zone:hover { border-color: var(--accent); background: var(--surface-2); }
.file-zone:focus-within { outline: 2px solid var(--focus); outline-offset: 2px; }
.file-zone-icon {
  font-size: 22px; color: var(--accent);
  margin-bottom: 4px;
}
.file-zone-text { font-weight: 600; font-size: 14px; }
.file-zone-sub { font-size: 12px; color: var(--text-dim); }
.file-zone input[type="file"] {
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0;
  clip: rect(0,0,0,0);
}

.or { color: var(--text-dim); margin: 0; font-family: var(--font-mono); font-size: 12px; }
.sample-row {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
}
.sample-label {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-dim); margin: 0 4px 0 0;
  letter-spacing: 0.04em;
}
.btn-mini {
  padding: 6px 12px; min-height: 30px;
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px; font-weight: 500;
  transition: var(--t-fast);
}
.btn-mini:hover { background: var(--surface); color: var(--accent); border-color: var(--accent); }

/* RESULTS */
.result {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 18px;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 16px;
}
@media (max-width: 720px) { .result { grid-template-columns: 1fr; } }
.result[aria-busy="true"] { opacity: 0.85; }

.result-image {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  min-height: 220px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.result-image img {
  max-width: 100%; max-height: 360px;
  object-fit: contain;
}
.placeholder {
  color: var(--text-dim); margin: 0;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.04em;
  padding: 22px;
  text-align: center;
}
.detect-stage { position: relative; }
.detect-overlay {
  position: absolute; inset: 0;
  pointer-events: none;
  width: 100%; height: 100%;
}
.det-box {
  fill: rgba(125,211,252,0.10);
  stroke: var(--accent);
  stroke-width: 2;
}
.det-label {
  font-family: var(--font-mono); font-size: 11px; font-weight: 700;
  fill: var(--inverse);
}
.det-label-bg {
  fill: var(--accent);
}

.result-data { display: flex; flex-direction: column; gap: 12px; }
.status {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim); margin: 0;
  padding: 8px 10px; border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
}
.status.is-progress {
  color: var(--accent);
  border-color: color-mix(in oklab, var(--accent) 40%, var(--line));
}
.status.is-error {
  color: var(--danger);
  border-color: color-mix(in oklab, var(--danger) 40%, var(--line));
}
.result-h {
  margin: 0;
  font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--text-dim);
}

.preds {
  margin: 0; padding: 0;
  list-style: none;
  display: flex; flex-direction: column; gap: 6px;
}
.preds li {
  display: grid;
  grid-template-columns: 28px 1fr 70px;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
}
.pred-rank {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent); font-weight: 700;
}
.pred-label { font-weight: 500; }
.pred-bar {
  position: relative;
  height: 14px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
}
.pred-bar span {
  position: absolute; left: 0; top: 0; bottom: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.pred-pct {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-mid);
}
.preds li:nth-child(1) .pred-rank,
.preds li:nth-child(1) .pred-pct { color: var(--accent); }

.detect-list {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-direction: column; gap: 4px;
}
.detect-list li {
  display: flex; justify-content: space-between;
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 13px;
}
.detect-list .det-name { color: var(--text); font-weight: 500; }
.detect-list .det-conf { font-family: var(--font-mono); color: var(--accent); }

.timing {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-dim); margin: 0;
  padding-top: 8px; border-top: 1px solid var(--line-soft);
  letter-spacing: 0.04em;
}

/* SENTIMENT */
.sent-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.sent-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; color: var(--text-dim); text-transform: uppercase; }
#sent-input {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 15px; line-height: 1.55;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  resize: vertical;
  min-height: 100px;
}
#sent-input:focus-visible { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 30%, transparent); }
.sent-controls { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.result-sentiment { display: block; }
.sent-out { display: flex; flex-direction: column; gap: 14px; padding-top: 14px; border-top: 1px solid var(--line-soft); margin-top: 12px; }
.sent-verdict {
  font-family: var(--font-display); font-style: italic;
  font-size: 22px; font-weight: 600;
  margin: 0;
}
.sent-verdict.positive { color: var(--success); }
.sent-verdict.negative { color: var(--danger); }
.sent-bars { display: flex; flex-direction: column; gap: 8px; }
.sent-bar {
  display: grid;
  grid-template-columns: 80px 1fr 50px;
  gap: 10px;
  align-items: center;
  font-size: 13px;
}
.sent-bar-label { color: var(--text-mid); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; }
.sent-bar-track {
  position: relative;
  height: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.sent-bar-track span {
  position: absolute; inset: 0;
  border-radius: 999px;
  transition: width var(--t-mid) var(--ease-out);
}
.sent-bar.pos .sent-bar-track span { background: linear-gradient(90deg, var(--success), #b6f0c8); }
.sent-bar.neg .sent-bar-track span { background: linear-gradient(90deg, var(--danger), #ffb1bb); }
.sent-bar-val { font-family: var(--font-mono); font-size: 12px; color: var(--text); text-align: right; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 18px; min-height: 40px;
  background: var(--accent); color: var(--inverse);
  border: 1px solid var(--accent);
  border-radius: 8px;
  font-weight: 600; font-size: 13px;
  letter-spacing: 0.02em;
  transition: transform var(--t-fast) var(--ease-out), background var(--t-fast);
}
.btn:hover { transform: translateY(-1px); background: #a5e0ff; }
.btn[aria-disabled="true"] { opacity: 0.6; cursor: wait; transform: none; }
.btn-ghost {
  background: transparent; color: var(--text-mid);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }

/* HOW */
.how-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.how-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
}
.how-grid h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-family: var(--font-display);
  font-style: italic;
}
.how-grid p {
  margin: 0;
  font-size: 14px; line-height: 1.6;
  color: var(--text-mid);
}

/* FOOTER */
.foot {
  padding: 32px var(--gutter);
  border-top: 1px solid var(--line);
  margin-top: 40px;
}
.foot p {
  max-width: var(--maxw); margin: 0 auto;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}