:root {
  --fbio-brand: #1b6ac9;
  --fbio-accent: #0ab27d;
  --fbio-warn: #c92a2a;
  --fbio-text: #222;
  --fbio-muted: #6b7280;
  --fbio-bg: #f7f8fb;
  --fbio-card: #ffffff;
  --fbio-border: #e5e7eb;
  --fbio-focus: #2563eb;
}

.fbio-container { max-width: 1100px; margin: 0 auto; padding: 24px 16px 48px; color: var(--fbio-text); }
.fbio-header { margin-bottom: 16px; }
.fbio-title { margin: 0 0 6px 0; color: var(--fbio-brand); font-weight: 800; font-size: 1.75rem; letter-spacing: .2px; }
.fbio-subtitle { margin: 0; color: #2b2b2b; font-size: 1rem; }
.fbio-card { background: var(--fbio-card); border: 1px solid var(--fbio-border); border-radius: 10px; padding: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }

.fbio-tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--fbio-border); margin-bottom: 12px; }
.fbio-tab { appearance: none; border: 0; background: transparent; padding: 10px 14px; margin: 0; border-bottom: 3px solid transparent; color: #374151; cursor: pointer; border-top-left-radius: 6px; border-top-right-radius: 6px; }
.fbio-tab[aria-selected="true"] { color: var(--fbio-brand); border-bottom-color: var(--fbio-brand); background: #f0f6ff; }
.fbio-tab:focus-visible { outline: 2px solid var(--fbio-focus); outline-offset: 2px; }

.fbio-panel { display: none; padding-top: 8px; }
.fbio-panel.active { display: block; }

.fbio-row { display: grid; grid-template-columns: repeat(12, 1fr); gap: 12px; }
.fbio-col-3 { grid-column: span 3; }
.fbio-col-4 { grid-column: span 4; }
.fbio-col-6 { grid-column: span 6; }
.fbio-col-8 { grid-column: span 8; }
.fbio-col-12 { grid-column: span 12; }
@media (max-width: 900px) { .fbio-col-3, .fbio-col-4, .fbio-col-6, .fbio-col-8 { grid-column: span 6; } }
@media (max-width: 600px) { .fbio-col-3, .fbio-col-4, .fbio-col-6, .fbio-col-8 { grid-column: span 12; } }

.fbio-field { display: flex; flex-direction: column; gap: 6px; }
.fbio-label { font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.fbio-input { padding: 10px 12px; border: 1px solid var(--fbio-border); border-radius: 8px; font-size: 0.95rem; background: #fff; color: var(--fbio-text); }
.fbio-input:focus { outline: none; border-color: var(--fbio-focus); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
.fbio-input[type="number"] { text-align: right; }
.fbio-hint { color: var(--fbio-muted); font-size: 0.85rem; }
.fbio-error { color: var(--fbio-warn); font-size: 0.85rem; display: none; }
.fbio-error.show { display: block; }

.fbio-tip { display: inline-block; width: 18px; height: 18px; line-height: 18px; text-align: center; border-radius: 50%; background: #eef2ff; color: #3b82f6; font-size: 12px; cursor: help; position: relative; }
.fbio-tip:hover::after, .fbio-tip:focus::after { content: attr(data-tip); position: absolute; left: 50%; transform: translateX(-50%); bottom: 130%; background: #111827; color: #f9fafb; white-space: normal; max-width: 260px; padding: 8px 10px; font-size: 12px; border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,0.25); z-index: 10; }

.fbio-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }
.fbio-btn { appearance: none; border: 1px solid var(--fbio-border); background: #fff; color: #111827; padding: 10px 14px; border-radius: 8px; cursor: pointer; font-weight: 600; }
.fbio-btn:focus-visible { outline: 2px solid var(--fbio-focus); outline-offset: 2px; }
.fbio-btn-primary { background: var(--fbio-brand); color: #fff; border-color: var(--fbio-brand); }
.fbio-btn-primary:hover { background: #155aa9; border-color: #155aa9; }
.fbio-btn-success { background: var(--fbio-accent); color: #fff; border-color: var(--fbio-accent); }
.fbio-btn-success:hover { background: #079b6c; border-color: #079b6c; }
.fbio-btn-outline { background: #fff; color: #111827; border-color: #cbd5e1; }
.fbio-btn-outline:hover { background: #f8fafc; }

.fbio-result { border-left: 4px solid var(--fbio-accent); background: #ecfbf6; padding: 12px 14px; border-radius: 6px; color: #0f5132; display: none; margin-top: 8px; }
.fbio-result.show { display: block; }
.fbio-warning { border-left: 4px solid var(--fbio-warn); background: #fff5f5; padding: 10px 12px; border-radius: 6px; color: #842029; display: none; margin-top: 8px; }
.fbio-warning.show { display: block; }
.fbio-explain { border: 1px dashed var(--fbio-border); border-radius: 8px; padding: 12px; margin-top: 12px; background: #fff; display: none; }
.fbio-explain.show { display: block; }

.fbio-badges { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.fbio-badge { background: #eef2f7; color: #495057; padding: 2px 6px; font-size: 0.8rem; border-radius: 6px; }

.fbio-footer { margin-top: 20px; }
.fbio-footer .fbio-note { color: var(--fbio-muted); font-size: 0.95rem; }

/* Print */
@media print {
  .fbio-tabs, .fbio-actions { display: none !important; }
  .fbio-panel { display: none !important; }
  .fbio-panel.active { display: block !important; }
  .fbio-result, .fbio-warning, .fbio-explain { display: block !important; }
  .fbio-card { border: none; box-shadow: none; }
}