.fk-page { padding: 56px 0 100px; display: flex; flex-direction: column; align-items: center; }
.fk-intro { text-align: center; max-width: 46ch; margin-bottom: 28px; }
.fk-intro .hero__eyebrow { margin-bottom: 18px; }
.fk-intro h1 { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.4rem); letter-spacing: -0.02em; margin: 0 0 10px; }
.fk-intro p { color: var(--ink-soft); margin: 0; line-height: 1.6; }

.fk-input-area { width: 100%; max-width: 560px; margin-bottom: 24px; }
.fk-input-wrap { display: flex; flex-direction: column; gap: 8px; }
.fk-input-label { font-size: 0.82rem; font-weight: 600; color: var(--ink-soft); }
.fk-input-row { display: flex; gap: 8px; }
.fk-numbers-input { flex: 1; border: 2px solid var(--line); border-radius: 14px; padding: 14px 18px; font-family: var(--font-mono); font-size: 1.1rem; font-weight: 600; background: var(--surface); color: var(--ink); transition: border-color var(--dur-fast) var(--ease); }
.fk-numbers-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(61,90,254,0.1); }
.fk-clear-btn { width: 44px; border: 2px solid var(--line); border-radius: 14px; background: var(--surface); cursor: pointer; display: flex; align-items: center; justify-content: center; color: var(--ink-soft); transition: background var(--dur-fast) var(--ease); }
.fk-clear-btn:hover { background: rgba(231,76,60,0.08); color: #e74c3c; border-color: #e74c3c; }

.fk-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.fk-chip { background: var(--accent); color: #fff; padding: 6px 14px; border-radius: 999px; font-family: var(--font-mono); font-size: 0.82rem; font-weight: 600; display: flex; align-items: center; gap: 6px; }
.fk-chip__remove { cursor: pointer; opacity: 0.7; font-size: 1rem; line-height: 1; }
.fk-chip__remove:hover { opacity: 1; }

.fk-results { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; max-width: 560px; margin-bottom: 28px; }
.fk-result-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 16px; text-align: center; }
.fk-result-card--fpb { border-left: 4px solid #e74c3c; }
.fk-result-card--kpk { border-left: 4px solid #2ecc71; }
.fk-result-card--full { grid-column: 1/-1; border-left: 4px solid var(--accent); }
.fk-result-label { font-size: 0.7rem; font-weight: 700; color: var(--ink-soft); display: block; margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.fk-result-value { font-family: var(--font-mono); font-size: 1.3rem; font-weight: 700; color: var(--ink); word-break: break-all; }

.fk-trees { width: 100%; max-width: 900px; margin-bottom: 28px; text-align: center; }
.fk-trees__title { font-family: var(--font-display); font-size: 1.2rem; margin: 0 0 16px; }
.fk-trees__grid { display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; }
.fk-tree-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 16px; min-width: 180px; }
.fk-tree-card__label { font-family: var(--font-mono); font-size: 0.78rem; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.fk-tree-canvas { display: block; margin: 0 auto; }

.fk-steps { width: 100%; max-width: 560px; background: rgba(61,90,254,0.03); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 16px 18px; }
.fk-steps__title { font-size: 0.78rem; font-weight: 700; color: var(--ink); display: block; margin-bottom: 6px; }
.fk-steps__content { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft); line-height: 1.7; white-space: pre-wrap; }

@media (max-width: 500px) {
  .fk-numbers-input { font-size: 0.95rem; padding: 12px 14px; }
  .fk-result-value { font-size: 1.1rem; }
  .fk-tree-card { min-width: 140px; padding: 10px; }
}