:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --surface-muted: #f1efe8;
  --text-primary: #1a1a18;
  --text-secondary: #5f5e5a;
  --border: rgba(0,0,0,0.08);
  --green-bg: #eaf3de; --green-text: #27500a;
  --amber-bg: #faeeda; --amber-text: #633806;
  --red-bg: #fcebeb; --red-text: #791f1f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614;
    --surface: #222220;
    --surface-muted: #2c2c2a;
    --text-primary: #f1efe8;
    --text-secondary: #b4b2a9;
    --border: rgba(255,255,255,0.1);
    --green-bg: #173404; --green-text: #c0dd97;
    --amber-bg: #412402; --amber-text: #fac775;
    --red-bg: #501313; --red-text: #f7c1c1;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  padding-bottom: 70px;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
  padding-top: max(16px, env(safe-area-inset-top));
}

.loading { text-align: center; color: var(--text-secondary); margin-top: 40px; }

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

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
}

.date-label { font-size: 13px; color: var(--text-secondary); margin: 0; }
.week-label { font-size: 17px; font-weight: 600; margin: 2px 0 0; }

.status-badge {
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  white-space: nowrap;
}
.status-green { background: var(--green-bg); color: var(--green-text); }
.status-amber { background: var(--amber-bg); color: var(--amber-text); }
.status-red { background: var(--red-bg); color: var(--red-text); }

.status-message { font-size: 13px; color: var(--text-secondary); margin: 10px 0 0; }

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.metric-card {
  background: var(--surface-muted);
  border-radius: 10px;
  padding: 10px 12px;
}
.metric-label { font-size: 11px; color: var(--text-secondary); margin: 0; }
.metric-value { font-size: 20px; font-weight: 600; margin: 2px 0 0; }

.section-title {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0 0 8px;
}

.session-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 0.5px solid var(--border);
}
.session-row:last-child { border-bottom: none; }
.session-type { font-size: 14px; font-weight: 500; margin: 0; }
.session-meta { font-size: 12px; color: var(--text-secondary); margin: 2px 0 0; }

form { display: flex; flex-direction: column; gap: 10px; }
label { font-size: 13px; color: var(--text-secondary); }
input, select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 0.5px solid var(--border);
  background: var(--surface-muted);
  color: var(--text-primary);
  font-size: 15px;
}
button {
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  border: 0.5px solid var(--border);
  background: var(--surface-muted);
  color: var(--text-primary);
}
button.primary {
  background: #0F6E56;
  color: white;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  margin-top: 4px;
}
button.primary:active { opacity: 0.85; }

.tabbar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  background: var(--surface);
  border-top: 0.5px solid var(--border);
  padding: 8px max(8px, env(safe-area-inset-left)) max(8px, env(safe-area-inset-bottom));
}
.tab-btn {
  flex: 1;
  background: none;
  border: none;
  padding: 10px 4px;
  font-size: 12px;
  color: var(--text-secondary);
}
.tab-btn.active { color: var(--text-primary); font-weight: 600; }

.empty-state { text-align: center; color: var(--text-secondary); padding: 30px 0; font-size: 14px; }