/* ============ Design tokens ============ */
:root {
  --bg: #f4f1ea;            /* warm off-white, like recycled paper */
  --surface: #ffffff;
  --surface-muted: #ebe6dc;
  --text: #1f2a1f;
  --text-muted: #5f6b5c;
  --border: #ddd6c8;

  --leaf: #2f7d4f;          /* primary green */
  --leaf-dark: #22603b;
  --leaf-soft: #e1efe5;

  /* Category colours (used by Phase 3) */
  --recycling: #2b6cb0;     /* blue bin */
  --recycling-soft: #e3edf8;
  --compost: #6b8e23;       /* olive / organic */
  --compost-soft: #edf2dc;
  --landfill: #6d5d4b;      /* earthy brown-grey */
  --landfill-soft: #eee8e0;

  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow: 0 1px 2px rgba(31, 42, 31, 0.06), 0 8px 24px rgba(31, 42, 31, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a15;
    --surface: #1d241e;
    --surface-muted: #262e27;
    --text: #e8ede6;
    --text-muted: #9aa696;
    --border: #2f3830;
    --leaf: #5bb67f;
    --leaf-dark: #489a68;
    --leaf-soft: #1f3326;
    --recycling: #63a4e8;
    --recycling-soft: #1b2a3a;
    --compost: #a3c24a;
    --compost-soft: #28301a;
    --landfill: #b8a58f;
    --landfill-soft: #2e2a24;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
  }
}

/* ============ Base ============ */
*, *::before, *::after { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: "DM Sans", system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ============ Header ============ */
.site-header {
  padding: 28px 16px 8px;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--leaf-soft);
  color: var(--leaf);
}

.site-header h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 6px 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ============ Layout ============ */
.app {
  flex: 1;
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 20px 16px 32px;
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}

@media (min-width: 860px) {
  .app {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
    padding-top: 32px;
  }
}

/* ============ Camera card ============ */
.camera-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.camera-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-muted);
}

.camera-frame video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* Mirror only the front (selfie) camera; a rear camera should read true-to-life */
.camera-frame[data-facing="user"] video { transform: scaleX(-1); }

.camera-frame[data-active="true"] video { opacity: 1; }

.camera-frame[data-error="true"] .camera-placeholder { color: #c0392b; }
.camera-frame[data-error="true"] .corner { border-color: #c0392b; }
.camera-frame[data-active="true"] .camera-placeholder { opacity: 0; pointer-events: none; }

.camera-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-align: center;
  padding: 16px;
  color: var(--text-muted);
  transition: opacity 0.3s ease;
}

.camera-placeholder p {
  margin: 8px 0 0;
  font-weight: 500;
  color: var(--text);
}

.camera-placeholder span { font-size: 0.9rem; }

/* Scan-area corner brackets */
.corner {
  position: absolute;
  width: 28px;
  height: 28px;
  border: 3px solid var(--leaf);
  opacity: 0.7;
}
.corner.tl { top: 14px; left: 14px; border-right: 0; border-bottom: 0; border-top-left-radius: 8px; }
.corner.tr { top: 14px; right: 14px; border-left: 0; border-bottom: 0; border-top-right-radius: 8px; }
.corner.bl { bottom: 14px; left: 14px; border-right: 0; border-top: 0; border-bottom-left-radius: 8px; }
.corner.br { bottom: 14px; right: 14px; border-left: 0; border-top: 0; border-bottom-right-radius: 8px; }

/* ============ Button ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 20px;
  border: 0;
  border-radius: 999px;
  background: var(--leaf);
  color: #fff;
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
}

.btn:hover { background: var(--leaf-dark); }
.btn:active { transform: scale(0.98); }
.btn:focus-visible { outline: 3px solid var(--leaf-soft); outline-offset: 3px; }
.btn:disabled { opacity: 0.6; cursor: progress; }

.btn-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: currentColor;
}

/* "Stop" state, toggled in Phase 2 via aria-pressed */
.btn[aria-pressed="true"] {
  background: var(--surface-muted);
  color: var(--text);
}
.btn[aria-pressed="true"] .btn-dot {
  background: #c0392b;
  animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ============ Result card ============ */
.result-card {
  --accent: var(--leaf);
  --accent-soft: var(--leaf-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 6px solid var(--accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.result-card[data-state="idle"]      { --accent: var(--border); }
.result-card[data-state="recycling"] { --accent: var(--recycling); --accent-soft: var(--recycling-soft); background: var(--accent-soft); }
.result-card[data-state="compost"]   { --accent: var(--compost);   --accent-soft: var(--compost-soft);   background: var(--accent-soft); }
.result-card[data-state="landfill"]  { --accent: var(--landfill);  --accent-soft: var(--landfill-soft);  background: var(--accent-soft); }

.result-eyebrow {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.result-label {
  margin: 4px 0 20px;
  font-size: clamp(2.5rem, 9vw, 3.75rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--accent);
  overflow-wrap: anywhere;
}

/* idle = no camera, uncertain = camera on but no confident answer */
.result-card[data-state="uncertain"] { --accent: var(--text-muted); }
.result-card[data-state="idle"] .result-label,
.result-card[data-state="uncertain"] .result-label { color: var(--text-muted); }

.result-hint {
  margin: 12px 0 0;
  min-height: 1.5em;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.confidence {
  display: flex;
  align-items: center;
  gap: 12px;
}

.confidence-bar {
  flex: 1;
  height: 10px;
  border-radius: 999px;
  background: var(--surface-muted);
  overflow: hidden;
}

.confidence-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 0.25s ease;
}

.confidence-text {
  min-width: 3.5ch;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  color: var(--text-muted);
}

/* Legend */
.legend {
  list-style: none;
  margin: 24px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend-item span {
  width: 12px;
  height: 12px;
  border-radius: 4px;
}
.legend-item.recycling span { background: var(--recycling); }
.legend-item.compost span   { background: var(--compost); }
.legend-item.landfill span  { background: var(--landfill); }

.legend-pct {
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.legend-pct:empty { display: none; }

/* ============ Footer ============ */
.site-footer {
  padding: 16px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.site-footer p { margin: 0; }

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