*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f5f5f0;
  --surface: #ffffff;
  --border: rgba(0,0,0,0.10);
  --border-strong: rgba(0,0,0,0.18);
  --text: #1a1a1a;
  --text-secondary: #6b6b6b;
  --green: #0f6e56;
  --green-bg: #e1f5ee;
  --orange: #993c1d;
  --orange-bg: #faece7;
  --radius: 14px;
  --radius-sm: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111110;
    --surface: #1c1c1a;
    --border: rgba(255,255,255,0.10);
    --border-strong: rgba(255,255,255,0.18);
    --text: #f0ede8;
    --text-secondary: #888780;
    --green: #5dcaa5;
    --green-bg: #04342c;
    --orange: #f0997b;
    --orange-bg: #4a1b0c;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  padding: env(safe-area-inset-top, 16px) 16px env(safe-area-inset-bottom, 24px);
}

.app { max-width: 480px; margin: 0 auto; padding-top: 12px; }

h1 { font-size: 22px; font-weight: 600; margin-bottom: 4px; }
.subtitle { font-size: 14px; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.5; }

.card {
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

/* Atomic clock */
.clock-label { font-size: 11px; color: var(--text-secondary); margin-bottom: 4px; letter-spacing: 0.04em; text-transform: uppercase; }
.clock-row { display: flex; align-items: center; gap: 10px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); animation: pulse 1.5s infinite; flex-shrink: 0; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.25} }
.atomic-time { font-size: 36px; font-weight: 500; font-variant-numeric: tabular-nums; letter-spacing: 1px; }

/* Camera button */
.photo-btn-wrap { position: relative; width: 100%; }
.photo-btn-wrap input[type=file] {
  position: absolute; inset: 0; opacity: 0;
  width: 100%; height: 100%; cursor: pointer; z-index: 2;
  font-size: 16px; /* prevent iOS zoom */
}
.photo-btn {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 16px;
  border-radius: var(--radius-sm);
  border: 0.5px solid var(--border-strong);
  background: var(--text); color: var(--surface);
  font-size: 16px; font-weight: 500; cursor: pointer;
}

/* Preview */
.preview-wrap { margin-top: 12px; display: none; border-radius: var(--radius-sm); overflow: hidden; background: #000; }
.preview-wrap img { width: 100%; display: block; max-height: 280px; object-fit: contain; }

.analyze-btn {
  display: none; width: 100%; margin-top: 10px; padding: 14px;
  border-radius: var(--radius-sm); border: 0.5px solid var(--border-strong);
  background: transparent; color: var(--text);
  font-size: 15px; font-weight: 500; cursor: pointer;
  transition: opacity .15s;
}
.analyze-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.status {
  font-size: 13px; color: var(--text-secondary);
  margin-top: 10px; min-height: 20px; text-align: center;
}

/* Metrics */
.metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.metric { background: var(--bg); border-radius: var(--radius-sm); padding: 12px 8px; text-align: center; }
.metric-label { font-size: 11px; color: var(--text-secondary); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.04em; }
.metric-value { font-size: 20px; font-weight: 500; font-variant-numeric: tabular-nums; color: var(--text-secondary); }
.metric-value.advance { color: var(--green); }
.metric-value.retard { color: var(--orange); }
.metric-value.exact { color: var(--text); }

/* Result */
.result-detail {
  margin-top: 14px; border-left: 3px solid var(--border-strong);
  padding-left: 12px; display: none;
}
.result-detail p { font-size: 13px; color: var(--text-secondary); line-height: 1.65; }
.result-detail strong { color: var(--text); }

/* History */
.section-label { font-size: 11px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 10px; }
.history-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; border-bottom: 0.5px solid var(--border); font-size: 13px;
}
.history-item:last-child { border-bottom: none; }
.history-meta { color: var(--text-secondary); }
.badge { padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.badge.advance { background: var(--green-bg); color: var(--green); }
.badge.retard { background: var(--orange-bg); color: var(--orange); }
.badge.exact { background: var(--bg); color: var(--text-secondary); }

.footer-note {
  font-size: 12px; color: var(--text-secondary); text-align: center;
  margin-top: 8px; line-height: 1.6; padding-bottom: 8px;
}

.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--border-strong); border-top-color: var(--text); border-radius: 50%; animation: spin .7s linear infinite; vertical-align: middle; margin-right: 6px; }
@keyframes spin { to { transform: rotate(360deg); } }