:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1a1d23;
  --muted: #6b7280;
  --border: #e2e4e9;
  --primary: #1f6feb;
  --primary-text: #ffffff;
  --danger: #d1242f;
  --success: #1a7f37;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --card-bg: #161b22;
    --text: #e6edf3;
    --muted: #9198a1;
    --border: #30363d;
    --primary: #4c8fff;
    --primary-text: #0d1117;
    --danger: #ff7b72;
    --success: #56d364;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body.centered {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  width: 100%;
  max-width: 360px;
}

.card h1 { margin: 0 0 4px; font-size: 1.5rem; }
.subtitle { color: var(--muted); margin: 0 0 20px; font-size: 0.9rem; }

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 14px;
}

input, select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--primary);
  color: var(--primary-text);
}

button.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

button.danger { background: var(--danger); color: #fff; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.error { color: var(--danger); font-size: 0.85rem; }
.muted { color: var(--muted); }

header.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--card-bg);
}

header.app-header h1 { font-size: 1.1rem; margin: 0; }

nav.tabs {
  display: flex;
  gap: 4px;
  padding: 12px 24px 0;
}

.tab-btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  padding: 8px 16px;
  font-weight: 500;
}

.tab-btn.active { background: var(--bg); color: var(--text); }

main { padding: 24px; max-width: 720px; margin: 0 auto; }

.tab-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0 12px 12px 12px;
  padding: 24px;
}

.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 16px; }
.row label { flex: 1; min-width: 160px; margin-bottom: 0; }

.qr-wrap { text-align: center; padding: 16px 0; }
.qr-wrap img { max-width: 260px; width: 100%; border-radius: 8px; border: 1px solid var(--border); background: #fff; }

.status-pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--border);
}

#summary-box h3 { font-size: 0.95rem; margin: 16px 0 4px; color: var(--primary); }
#summary-box p { margin: 0; white-space: pre-wrap; line-height: 1.5; }
#summary-box ul { margin: 4px 0; padding-left: 20px; }