:root {
  color-scheme: light dark;
  --fsm-font: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --fsm-font-size: 17.5px;
  --fsm-line: 1.6;

  /* Light */
  --fsm-bg: #ffffff;
  --fsm-surface: #fbfbfb;
  --fsm-border: #d6dae1;
  --fsm-text: #0f172a; /* a bit darker for contrast */
  --fsm-muted: #374151; /* darker than before for higher contrast on light */
  --fsm-accent: #2563eb;

  /* Dark (high contrast) */
  --fsm-bg-dark: #0e141b;
  --fsm-surface-dark: #121a23;
  --fsm-border-dark: #2c3a4a;
  --fsm-text-dark: #e6edf5;
  --fsm-muted-dark: #cbd5e1;
  --fsm-accent-dark: #3b82f6;

  --fsm-radius: 14px;
  --fsm-shadow: 0 1px 2px rgba(0,0,0,.05), 0 8px 24px rgba(0,0,0,.06);
}

.fsm-wrap { font-family: var(--fsm-font); font-size: var(--fsm-font-size); line-height: var(--fsm-line); max-width: 940px; margin: 28px auto; padding: 0 18px; color: var(--fsm-text); }
.fsm-card { background: var(--fsm-surface); border: 1px solid var(--fsm-border); border-radius: var(--fsm-radius); padding: 20px; box-shadow: var(--fsm-shadow); margin-bottom: 20px; }
.fsm-title { margin: 0 0 10px; font-size: 1.6rem; line-height: 1.3; }
.fsm-disclaimer { color: var(--fsm-muted); margin: 0 0 14px; white-space: normal; overflow: visible; display: block; }

/* Inline disclaimer variant below checkbox */
.fsm-disclaimer-inline {
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px dashed var(--fsm-border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--fsm-accent) 4%, transparent);
}
@media (prefers-color-scheme: dark) {
  .fsm-wrap { color: var(--fsm-text-dark); }
  .fsm-card { background: var(--fsm-surface-dark); border-color: var(--fsm-border-dark); }
  .fsm-title { color: var(--fsm-text-dark); }
  .fsm-disclaimer { color: var(--fsm-muted-dark); }
  .fsm-disclaimer-inline {
    border-color: var(--fsm-border-dark);
    background: color-mix(in srgb, var(--fsm-accent-dark) 6%, transparent);
  }
}

.fsm-form { display: grid; gap: 16px; }
.fsm-fieldset { border: 1px solid var(--fsm-border); border-radius: 12px; padding: 12px 14px; }
.fsm-legend { font-weight: 700; padding: 0 6px; }
.fsm-radio { display: inline-flex; align-items: center; gap: 8px; margin-right: 18px; cursor: pointer; }

.fsm-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .fsm-grid { grid-template-columns: 1fr; } }

.fsm-field label { display: block; font-weight: 700; margin-bottom: 6px; }
.fsm-input, .fsm-textarea {
  width: 100%; border: 1px solid var(--fsm-border); background: var(--fsm-bg);
  border-radius: 10px; padding: 12px 14px; font-size: 1.05rem; line-height: 1.55; color: var(--fsm-text);
}
/* Increase Freitext field size and legibility */
.fsm-textarea { resize: vertical; min-height: 200px; font-size: 1.1rem; }

/* Higher-contrast placeholders on light */
.fsm-input::placeholder, .fsm-textarea::placeholder { color: var(--fsm-muted); opacity: 1; }
@media (prefers-color-scheme: dark) {
  .fsm-input, .fsm-textarea { background: #0f1520; border-color: var(--fsm-border-dark); color: var(--fsm-text-dark); }
  .fsm-input::placeholder, .fsm-textarea::placeholder { color: var(--fsm-muted-dark); opacity: 1; }
}

.fsm-input:focus, .fsm-textarea:focus {
  outline: none; border-color: var(--fsm-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--fsm-accent) 25%, transparent);
}
@media (prefers-color-scheme: dark) {
  .fsm-input:focus, .fsm-textarea:focus {
    border-color: var(--fsm-accent-dark);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--fsm-accent-dark) 30%, transparent);
  }
}

.fsm-checkbox { display: flex; align-items: flex-start; gap: 10px; margin-top: 6px; }
.fsm-checkbox input { margin-top: 3px; }

.fsm-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.fsm-btn {
  appearance: none; border: 1px solid var(--fsm-border); background: var(--fsm-accent); color: #fff;
  padding: 11px 16px; border-radius: 10px; font-weight: 700; cursor: pointer; transition: transform .02s ease, box-shadow .2s ease, opacity .2s;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
}
.fsm-btn:hover { transform: translateY(-1px); }
.fsm-btn:active { transform: translateY(0); }
.fsm-btn[disabled] { opacity: .6; cursor: not-allowed; }
.fsm-btn-secondary { background: transparent; color: inherit; }
.fsm-btn-secondary:hover { background: rgba(0,0,0,.03); }
@media (prefers-color-scheme: dark) {
  .fsm-btn { background: var(--fsm-accent-dark); }
  .fsm-btn-secondary:hover { background: rgba(255,255,255,.05); }
}

.fsm-spinner { width: 18px; height: 18px; border-radius: 999px; border: 2px solid transparent; border-top-color: currentColor; display:inline-block; }
@keyframes fsm-spin { from { transform: rotate(0); } to { transform: rotate(360deg); } }
.fsm-spinner[aria-hidden="true"] { display:none; }
.fsm-btn .fsm-spinner { animation: fsm-spin 800ms linear infinite; }

.fsm-result { min-height: 40px; overflow-x: auto; }
.fsm-result p { margin: 0 0 10px; }

/* Table styling for protocol */
.fsm-output table { width: 100%; border-collapse: collapse; margin: 10px 0 6px; font-variant-numeric: tabular-nums; }
.fsm-output thead th { text-align: left; border-bottom: 2px solid var(--fsm-border); padding: 10px; }
.fsm-output tbody td { border-bottom: 1px solid var(--fsm-border); padding: 8px 10px; vertical-align: top; }
.fsm-output tr:hover { background: rgba(0,0,0,.02); }
@media (prefers-color-scheme: dark) {
  .fsm-output thead th { border-color: var(--fsm-border-dark); }
  .fsm-output tbody td { border-color: var(--fsm-border-dark); }
  .fsm-output tr:hover { background: rgba(255,255,255,.03); }
}

.fsm-result, .fsm-output {
  color: var(--fsm-text);
}
@media (prefers-color-scheme: dark) {
  .fsm-result, .fsm-output {
    color: var(--fsm-text-dark);
  }
}