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#7b542c;border-radius:15px;background:linear-gradient(90deg,rgba(255,255,255,.6) 0 1px,transparent 1px 8.333%),linear-gradient(180deg,#fff7ea,#eadcc7);box-shadow:inset 0 -12px #50301414,0 12px #50301429}.fb-bridge-segment{min-width:0;display:grid;place-items:center;border-right:2px solid rgba(99,61,27,.22);background:linear-gradient(180deg,#f6c66c,#e8a748);color:#3b2613;font-size:clamp(.75rem,2.4vw,1rem);font-weight:950;animation:fb-board-drop .18s ease-out both}.fb-bridge-segment.overflow{background:linear-gradient(180deg,#f2a292,#dd6955);color:#fff}.fb-target-line{position:absolute;top:-5px;bottom:-5px;left:var(--fb-target);width:0;border-left:3px solid #1d7148;pointer-events:none}.fb-bridge-arch{position:absolute;z-index:1;left:32px;right:32px;top:104px;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;pointer-events:none}.fb-bridge-arch span{height:52px;border:6px solid rgba(123,84,44,.34);border-top:0;border-radius:0 0 999px 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i:nth-child(odd){border-radius:999px;background:var(--gold)}.pattern-train-preview i:last-child{border:2px dashed rgba(36,93,168,.42);background:#ffffffb3}@media(max-width:620px){.pattern-track{grid-template-columns:repeat(3,minmax(0,1fr));padding:18px 12px 28px}.pattern-options{grid-template-columns:1fr}}.part-whole-card{gap:18px}.part-whole-model{display:grid;gap:18px}.whole-tray,.part-tray{border:1px solid rgba(36,93,168,.14);border-radius:18px;background:radial-gradient(circle at 12% 14%,rgba(255,255,255,.92),transparent 28%),linear-gradient(135deg,#eef7ff,#f3fbf7);box-shadow:0 12px 24px #1c2d4314}.whole-tray{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:8px 18px;padding:20px}.whole-tray span,.part-tray span{color:var(--muted);font-size:.82rem;font-weight:850;text-transform:uppercase}.whole-tray strong{color:var(--green);font-size:clamp(2.2rem,8vw,4rem);line-height:1}.whole-tray .dot-set{grid-column:1 / 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dashed rgba(36,93,168,.22);border-radius:12px}.part-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.part-option{min-height:70px;border:2px solid rgba(36,93,168,.14);border-radius:14px;background:var(--surface-strong);color:var(--ink);font-size:1.6rem;font-weight:950;cursor:pointer;transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}.part-option:hover{transform:translateY(-2px);border-color:#2f7f6f6b;box-shadow:0 12px 22px #1c2d431a}.part-option:focus-visible{outline:3px solid rgba(47,127,111,.28);outline-offset:3px}.part-option.selected{border-color:var(--green);box-shadow:0 0 0 4px #2f7f6f24}.part-whole-preview{display:grid;grid-template-columns:1fr 1fr;gap:8px}.part-whole-preview span{display:grid;place-items:center;min-height:34px;border-radius:10px;background:#e9ad3d38;color:var(--gold-ink);font-weight:950}.part-whole-preview span:last-child{background:#2f7f6f29;color:var(--green)}@media(max-width:620px){.whole-tray,.part-trays{grid-template-columns:1fr}.part-plus,.part-total{min-height:44px}.part-options{grid-template-columns:1fr}}