:root {
  --bg: #faf9f6;
  --ink: #1c1c1a;
  --muted: #7a7a74;
  --faint: #a8a8a1;
  --line: #e3e2dc;
  --accent: #3c5f45;
  --accent-soft: #eef1ea;
  --panel: #ffffff;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --track-1: #f2622e;
  --track-2: #4dd9d0;
  --track-3: #d7b64d;
  --track-4: #6a6f9c;
  --track-5: #e5484d;
  --track-6: #4d8fd9;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.wrap-wide { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
a:hover { color: var(--accent); text-decoration-color: var(--accent); }

h1, h2, h3, h4 { font-weight: 600; margin: 0; }
p { margin: 0; }
code {
  background: var(--accent-soft); color: var(--accent);
  padding: 1px 5px; border-radius: 3px; font-size: 0.9em;
}

/* header */
.site-header { padding: 20px 0; border-bottom: 1px solid var(--line); }
.site-header .wrap-wide { display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 600; font-size: 15px; letter-spacing: -0.01em; }
.site-header nav a { margin-left: 24px; font-size: 14px; text-decoration: none; color: var(--muted); }
.site-header nav a:hover { color: var(--ink); }

/* hero */
.hero { padding: 64px 0 48px; }
.kicker { font-size: 13px; color: var(--faint); margin-bottom: 18px; letter-spacing: 0.02em; }
.hero h1 {
  font-size: 28px; line-height: 1.32; margin: 0 0 20px;
  letter-spacing: -0.01em; max-width: 560px;
}
.hero .lede { color: #454540; font-size: 16px; max-width: 560px; margin: 0 0 28px; }

.note {
  font-size: 14.5px; color: var(--muted); border-left: 2px solid var(--line);
  padding-left: 16px; margin: 0 0 14px; max-width: 560px;
}
.note b { color: var(--ink); font-weight: 500; }

.repo-line { font-size: 13.5px; color: var(--muted); margin-top: 28px; }
.repo-line .sep { color: var(--faint); margin: 0 8px; }

/* generic section */
section { padding: 56px 0; border-top: 1px solid var(--line); }
.hero { border-top: none; }
section h2 { font-size: 19px; margin: 0 0 8px; }
.section-lede { color: var(--muted); font-size: 14.5px; max-width: 640px; margin: 0 0 32px; }

/* demo mode toggle */
.mode-toggle { display: flex; gap: 8px; margin-bottom: 28px; border-bottom: 1px solid var(--line); }
.mode-btn {
  background: none; border: none; font-family: var(--sans); font-size: 14.5px; color: var(--faint);
  padding: 0 0 12px; margin-right: 24px; cursor: pointer; border-bottom: 1px solid transparent;
}
.mode-btn.active { color: var(--ink); border-bottom-color: var(--accent); }
.mode-btn:hover:not(.active) { color: var(--ink); }
.mode-panel { display: none; }
.mode-panel.active { display: block; }

/* example mode */
.example-pairs { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
@media (max-width: 640px) { .example-pairs { grid-template-columns: 1fr; } }
.example-card {
  border: 1px solid var(--line); border-radius: 3px; overflow: hidden; background: var(--panel);
}
.example-card img { display: block; width: 100%; height: auto; }
.example-card .card-label {
  padding: 10px 14px; font-size: 12.5px; color: var(--muted);
  display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line);
}
.card-label .swap-btn {
  font-size: 12.5px; color: var(--muted); text-decoration: underline; text-decoration-color: var(--line);
  cursor: pointer; background: none; border: none; font-family: var(--sans); padding: 0;
}
.card-label .swap-btn:hover { color: var(--accent); text-decoration-color: var(--accent); }

.predict-row { display: flex; align-items: center; gap: 16px; margin: 24px 0; }

/* stage (interactive canvas area, live camera + example result) */
.stage {
  position: relative; background: #efeee9; border: 1px solid var(--line); border-radius: 3px;
  overflow: hidden; aspect-ratio: 4 / 3;
}
.stage video, .stage canvas, .stage img#uploadedPreview {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
.stage video { transform: scaleX(-1); }
.stage canvas { transform: scaleX(-1); pointer-events: none; }
.stage img#uploadedPreview { display: none; }
.stage.photo-mode video { display: none; }
.stage.photo-mode canvas { transform: none; }
.stage.photo-mode img#uploadedPreview { display: block; }

/* #exampleResultImg is never mirrored, so its overlay canvas must not be either --
   overrides the generic .stage canvas mirror rule above (ID beats class+element). */
#exampleResultImg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; background: #000; }
#exampleCanvas { transform: none; }
.stage-message {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 24px; color: var(--muted); font-size: 14.5px;
  background: rgba(250, 249, 246, 0.85);
}
.stage-message.hidden { display: none; }

.controls { display: flex; flex-direction: column; gap: 16px; margin-top: 20px; }
.step { border: 1px solid var(--line); border-radius: 3px; padding: 16px 18px; background: var(--panel); }
.step-head { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 14.5px; margin-bottom: 8px; }
.step-num {
  display: inline-flex; align-items: center; justify-content: center; width: 20px; height: 20px;
  border-radius: 50%; background: var(--accent); color: #fff; font-size: 11px; font-weight: 600; flex-shrink: 0;
}
.hint { font-size: 13.5px; color: var(--muted); margin-bottom: 10px; }

button {
  font: inherit; font-weight: 500; font-size: 13.5px; padding: 8px 15px; border-radius: 3px;
  border: 1px solid var(--line); background: #fff; color: var(--ink); cursor: pointer; margin-right: 8px;
}
button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover:not(:disabled) { background: #345239; color: #fff; }

.track-picker { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.track-swatch {
  display: flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 3px;
  border: 1px solid var(--line); background: #fff; font-size: 12.5px; cursor: pointer;
}
.track-swatch .dot { width: 10px; height: 10px; border-radius: 50%; }
.track-swatch.selected { border-color: var(--accent); background: var(--accent-soft); }

.upload-btn {
  display: inline-flex; align-items: center; font-weight: 500; font-size: 13.5px; padding: 8px 15px;
  border-radius: 3px; border: 1px dashed var(--line); color: var(--muted); cursor: pointer;
}
.upload-btn:hover { color: var(--accent); border-color: var(--accent); }
.upload-btn.disabled { opacity: 0.4; cursor: not-allowed; pointer-events: none; }

.suggestion-bar {
  margin-top: 16px; padding: 12px 16px; background: var(--accent-soft); border: 1px solid var(--line);
  border-radius: 3px; font-size: 14px;
}
.suggestion-label { color: var(--muted); margin-right: 8px; }
#suggestionText { font-weight: 600; color: var(--accent); }

.status-log {
  margin-top: 14px; font-size: 12px; color: var(--faint); font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre-wrap; max-height: 90px; overflow-y: auto;
}

/* pipeline build-list (borrowed pattern) */
.build-list { display: flex; flex-direction: column; gap: 22px; }
.build-item { display: grid; grid-template-columns: 90px 1fr; gap: 18px; }
.build-item .step-tag { font-size: 13px; color: var(--faint); }
.build-item h3 { font-size: 14.5px; margin: 0 0 6px; }
.build-item p { font-size: 14.5px; color: var(--muted); margin: 0; line-height: 1.6; }
@media (max-width: 520px) { .build-item { grid-template-columns: 1fr; } .build-item .step-tag { margin-bottom: -4px; } }

/* stack */
.stack-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 760px) { .stack-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .stack-grid { grid-template-columns: 1fr; } }
.stack-card { border: 1px solid var(--line); border-radius: 3px; padding: 16px; background: var(--panel); }
.stack-card h4 { font-size: 14px; margin-bottom: 6px; }
.stack-card p { font-size: 13.5px; color: var(--muted); margin: 0; }

/* footer */
.site-footer { padding: 28px 0; font-size: 13px; color: var(--faint); border-top: 1px solid var(--line); }