:root {
  color-scheme: dark;
  --bg: #0b1120;
  --surface: #111a2b;
  --surface-2: #172338;
  --surface-3: #1d2d47;
  --border: rgba(170, 198, 238, 0.16);
  --text: #f3f7ff;
  --muted: #9aabc5;
  --accent: #71e0c1;
  --accent-strong: #32c39c;
  --blue: #8eb6ff;
  --warning: #ffd18a;
  --danger: #ff9f9f;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.22);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  background: radial-gradient(circle at 15% 0%, rgba(59, 103, 155, 0.25), transparent 30rem), var(--bg);
  color: var(--text);
  line-height: 1.5;
}

button, input, select { font: inherit; }
button, label { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.48; }
button:focus-visible, input:focus-visible, select:focus-visible, label:has(input:focus-visible) { outline: 3px solid rgba(113, 224, 193, 0.5); outline-offset: 3px; }

.site-header, .site-footer, .page-shell { width: min(1440px, calc(100% - 48px)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; padding: 26px 0 20px; }
.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 30px 0 42px; color: var(--muted); font-size: 0.82rem; }
.brand { color: var(--text); font-weight: 800; letter-spacing: -0.04em; font-size: 1.12rem; text-decoration: none; }
.brand span { color: var(--accent); }
.status-pill { border: 1px solid var(--border); border-radius: 999px; padding: 6px 11px; color: var(--muted); font-size: 0.75rem; }
.status-ready { color: var(--accent); border-color: rgba(113, 224, 193, 0.35); background: rgba(113, 224, 193, 0.08); }
.status-loading { color: var(--warning); border-color: rgba(255, 209, 138, 0.35); background: rgba(255, 209, 138, 0.08); }
.status-error { color: var(--danger); border-color: rgba(255, 159, 159, 0.35); background: rgba(255, 159, 159, 0.08); }
.status-idle { color: var(--muted); }

.hero { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; padding: 58px 0 34px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 0.68rem; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 800px; margin-bottom: 16px; font-size: clamp(2.7rem, 6vw, 5.6rem); line-height: 0.98; letter-spacing: -0.075em; }
h2 { margin-bottom: 0; font-size: 1.1rem; letter-spacing: -0.025em; }
.hero-copy { max-width: 610px; margin-bottom: 0; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.17rem); }
.privacy-card { display: flex; align-items: center; gap: 12px; min-width: 230px; padding: 15px 18px; border: 1px solid var(--border); border-radius: 16px; background: rgba(23, 35, 56, 0.76); box-shadow: var(--shadow); }
.privacy-card strong, .privacy-card span { display: block; }
.privacy-card strong { font-size: 0.88rem; }
.privacy-card div span { color: var(--muted); font-size: 0.76rem; }
.privacy-icon { display: grid !important; place-items: center; width: 32px; height: 32px; border-radius: 10px; background: rgba(113, 224, 193, 0.12); color: var(--accent); font-size: 1.35rem; }
.notice { margin-bottom: 28px; padding: 13px 16px; border: 1px solid rgba(255, 209, 138, 0.24); border-radius: 12px; background: rgba(255, 209, 138, 0.075); color: #f5ddb2; font-size: 0.84rem; }

.workspace-grid, .lower-grid { display: grid; gap: 20px; }
.workspace-grid { grid-template-columns: minmax(0, 1.55fr) minmax(340px, 0.75fr); }
.lower-grid { grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr); margin-top: 20px; }
.side-column { display: grid; align-content: start; gap: 20px; }
.card { border: 1px solid var(--border); border-radius: 20px; background: rgba(17, 26, 43, 0.86); box-shadow: var(--shadow); }
.camera-card, .comparison-card, .log-card { padding: 24px; }
.controls-card, .metrics-card { padding: 22px; }
.card-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.compact-heading { margin-bottom: 20px; }
.muted, .helper-text, .slot-hint { color: var(--muted); font-size: 0.78rem; }

.video-stage { position: relative; display: grid; place-items: center; min-height: 420px; overflow: hidden; border: 1px solid var(--border); border-radius: 15px; background: #070d18; isolation: isolate; }
#camera-video, #overlay-canvas { display: block; width: 100%; height: 100%; min-height: 420px; object-fit: contain; }
#camera-video { position: relative; z-index: 1; background: #070d18; }
#overlay-canvas { position: absolute; inset: 0; z-index: 2; pointer-events: none; background: transparent; }
.mirror { transform: scaleX(-1); }
.guide-frame { position: absolute; z-index: 3; width: min(54%, 300px); aspect-ratio: 0.78; border: 1px dashed rgba(255, 255, 255, 0.36); border-radius: 44% 44% 42% 42%; pointer-events: none; opacity: 0.7; }
.camera-placeholder { position: absolute; z-index: 4; display: grid; gap: 3px; place-items: center; color: var(--muted); text-align: center; }
.camera-placeholder strong { color: var(--text); font-size: 0.95rem; }
.camera-placeholder-icon { color: var(--accent); font-size: 2.6rem; line-height: 1; }
.guidance-banner { position: absolute; z-index: 5; left: 16px; right: 16px; bottom: 16px; padding: 10px 13px; border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 10px; background: rgba(7, 13, 24, 0.76); color: var(--text); font-size: 0.82rem; text-align: center; backdrop-filter: blur(12px); }
.button-row { display: flex; flex-wrap: wrap; gap: 10px; padding: 18px 0 2px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 9px 14px; border: 1px solid transparent; border-radius: 10px; color: var(--text); font-size: 0.82rem; font-weight: 750; transition: 140ms ease; }
.button:hover:not(:disabled) { transform: translateY(-1px); filter: brightness(1.08); }
.button-primary { background: var(--accent-strong); color: #071711; }
.button-secondary { border-color: var(--border); background: var(--surface-2); }
.button-accent { border-color: rgba(142, 182, 255, 0.3); background: rgba(142, 182, 255, 0.12); color: var(--blue); }
.challenge-strip { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 18px; padding: 16px; border: 1px solid rgba(142, 182, 255, 0.16); border-radius: 14px; background: rgba(142, 182, 255, 0.06); }
.challenge-strip strong { display: block; font-size: 0.87rem; }

.control-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.control-grid label { display: grid; gap: 7px; color: var(--muted); font-size: 0.73rem; }
.control-grid label:nth-child(3), .control-grid label:nth-child(4), .control-grid label:nth-child(5) { grid-column: span 2; }
.control-grid output { float: right; color: var(--text); }
select, input[type="range"] { width: 100%; }
select { min-height: 38px; padding: 7px 10px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface-2); color: var(--text); }
input[type="range"] { accent-color: var(--accent); }
.toggle-list { display: grid; gap: 10px; margin-top: 18px; padding-top: 17px; border-top: 1px solid var(--border); }
.toggle-row { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 0.79rem; }
.toggle-row input { width: 15px; height: 15px; accent-color: var(--accent); }
.metrics-list { display: grid; gap: 0; margin: 0; }
.metrics-list div { display: flex; justify-content: space-between; gap: 20px; padding: 9px 0; border-bottom: 1px solid rgba(170, 198, 238, 0.09); }
.metrics-list div:last-child { border-bottom: 0; }
.metrics-list dt { color: var(--muted); font-size: 0.75rem; }
.metrics-list dd { max-width: 55%; margin: 0; color: var(--text); font-size: 0.75rem; text-align: right; }

.text-button { padding: 0; border: 0; background: transparent; color: var(--accent); font-size: 0.76rem; font-weight: 750; }
.image-slots { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.image-slot { min-width: 0; }
.slot-label { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 9px; font-size: 0.82rem; }
.slot-label span { color: var(--muted); font-size: 0.72rem; }
.preview-frame { display: grid; place-items: center; min-height: 210px; overflow: hidden; border: 1px dashed var(--border); border-radius: 12px; background: var(--surface-2); }
.preview-frame::before { content: "No image"; color: #5f718c; font-size: 0.78rem; }
.preview-frame:has(img[src=""]), .preview-frame:not(:has(img[src])) { color: #5f718c; }
.preview-frame img { display: block; width: 100%; height: 210px; object-fit: contain; }
.file-button { width: 100%; margin-top: 10px; }
.sample-picker { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; color: var(--muted); font-size: 0.72rem; }
.slot-hint { display: block; margin-top: 12px; }
.comparison-result { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 18px; padding: 16px; border-radius: 13px; background: var(--surface-2); }
.comparison-result div { display: grid; gap: 4px; }
.result-label { color: var(--muted); font-size: 0.7rem; }
.comparison-result strong { font-size: 0.9rem; }
.helper-text { margin: 13px 0 0; }
.event-log { display: grid; gap: 0; max-height: 314px; overflow: auto; margin: 0; padding: 0; list-style: none; }
.event-log li { display: grid; grid-template-columns: 65px 1fr; gap: 10px; padding: 10px 0; border-bottom: 1px solid rgba(170, 198, 238, 0.09); font-size: 0.77rem; }
.event-log time { color: var(--accent); font-variant-numeric: tabular-nums; }
.event-log span { color: var(--muted); }

@media (max-width: 1050px) {
  .workspace-grid, .lower-grid { grid-template-columns: 1fr; }
  .side-column { grid-template-columns: 1fr 1fr; align-items: start; }
}
@media (max-width: 720px) {
  .site-header, .site-footer, .page-shell { width: min(100% - 28px, 1440px); }
  .site-header { padding-top: 18px; }
  .hero { display: block; padding: 42px 0 24px; }
  .privacy-card { margin-top: 24px; }
  .side-column { grid-template-columns: 1fr; }
  .camera-card, .comparison-card, .log-card, .controls-card, .metrics-card { padding: 17px; }
  .video-stage, #camera-video, #overlay-canvas { min-height: 330px; }
  .challenge-strip, .site-footer { display: block; }
  .challenge-strip .button { width: 100%; margin-top: 13px; }
  .image-slots, .comparison-result { grid-template-columns: 1fr; }
  .comparison-result { gap: 10px; }
  .comparison-result div { grid-template-columns: 1fr 1fr; align-items: center; }
  .comparison-result strong { text-align: right; }
  .site-footer span { display: block; margin-top: 8px; }
}

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