:root{--sky: #7cc8ff;--blue: #1f76d2;--deep-blue: #0f4fa8;--cream: #fff8e8;--panel-bg: #fffdf6;--tile-empty: #f5ddb0;--tile-grass: #79c84a;--tile-grass-dark: #4a9b2f;--rail: #7b5a3a;--rail-metal: #d7d7d7;--red: #e94b35;--green: #27b84a;--yellow: #ffc928;--text: #24324a;--card-radius: 24px;--card-shadow: 0 12px 24px rgba(0,0,0,.18);--card-border: 4px solid rgba(255,255,255,.8)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Hiragino Sans,Noto Sans JP,sans-serif;font-weight:700;color:var(--text);background:linear-gradient(160deg,#a8d8ff,#7cc8ff,#b8e8b0 60%,#c8d8a0,#d8c890);background-attachment:fixed;min-height:100vh;overflow:hidden;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.game-shell{max-width:1600px;margin:0 auto;padding:16px 18px;height:100vh;height:100dvh;display:grid;grid-template-columns:240px 1fr;grid-template-rows:1fr;grid-template-areas:"palette 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span{font-size:9px}.icon-btn:hover{background:#ffffff59;transform:scale(1.08)}.icon-btn:active{transform:scale(.95)}.main-layout{grid-area:board;display:flex;gap:12px;min-height:0;overflow:hidden}.palette-stage-selector{display:flex;align-items:center;justify-content:center;gap:10px;padding:8px 12px;background:#1f76d214;border-radius:18px;border:2px dashed rgba(31,118,210,.25);margin-bottom:6px;flex-shrink:0}.palette-stage-info{display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--blue) 0%,var(--deep-blue) 100%);color:#fff;border-radius:14px;padding:4px 14px;border:2px solid rgba(255,255,255,.6);box-shadow:0 4px 8px #0f4fa840;min-width:76px;text-align:center}.palette-stage-info .stage-label{font-size:9px;text-transform:uppercase;letter-spacing:.5px;opacity:.9;font-weight:800;line-height:1;margin-bottom:2px}.palette-stage-info .stage-number{font-size:18px;font-weight:900;line-height:1.1;text-shadow:0 1px 2px 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.28) solid #1a6cc4}.station-goal .station-roof{border-bottom:calc(var(--tile-size) * .28) solid #c42030}.station-body{width:calc(var(--tile-size) * .58);height:calc(var(--tile-size) * .35);display:flex;align-items:flex-end;justify-content:center;gap:calc(var(--tile-size) * .05);padding-bottom:calc(var(--tile-size) * .04);border-radius:0 0 calc(var(--tile-size) * .05) calc(var(--tile-size) * .05)}.station-start .station-body{background:#38d}.station-goal .station-body{background:#e04050}.station-window{width:calc(var(--tile-size) * .11);height:calc(var(--tile-size) * .14);background:#c8e8ff;border-radius:calc(var(--tile-size) * .04) calc(var(--tile-size) * .04) 0 0}.station-door{width:calc(var(--tile-size) * .14);height:calc(var(--tile-size) * .19);border-radius:calc(var(--tile-size) * .04) calc(var(--tile-size) * .04) 0 0}.station-start .station-door{background:#1a5cb0}.station-goal .station-door{background:#b02030}.station-label{border-radius:calc(var(--tile-size) * 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