:root {
  --color-primary: #1a73e8;
  --color-primary-dark: #1d4ed8;
  --color-primary-hover: #1557b0;
  --color-danger: #dc2626;
  --color-danger-dark: #b91c1c;
  --color-bg: #f3f4f6;
  --color-surface: #ffffff;
  --color-header: #111827;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-border: #dfe3eb;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 99px;

  --shadow-sm: 0 1px 4px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.18);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 0;
  border-radius: var(--radius-md);
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  min-height: 44px;
  transition: background-color 0.15s ease, transform 0.05s ease;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-secondary { background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover { background: var(--color-bg); }

.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: var(--color-danger-dark); }

.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-4);
}

.input {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 11px 12px;
  font-size: 14px;
  font-family: var(--font-sans);
  outline: none;
  box-sizing: border-box;
}
.input:focus { border-color: var(--color-primary); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  background: var(--color-bg);
  color: var(--color-text);
}

.popover {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4);
  max-height: min(80vh, 640px);
  overflow-y: auto;
  box-sizing: border-box;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 480px) {
  .btn { width: 100%; }
  .card { padding: var(--space-3); border-radius: var(--radius-md); }
}