:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#0a0a0a;color:#fafafa}h1{margin:0 0 .75rem;font-size:1.5rem;font-weight:600;letter-spacing:-.02em}.app{min-height:100vh;display:flex;flex-direction:column;background:linear-gradient(180deg,#0a0e1a,#0d1525,#111827);overflow:hidden}.header{text-align:center;padding:1.5rem 1rem .5rem}.header h1{font-size:2rem;background:linear-gradient(135deg,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0}.header p{color:#ffffff73;font-size:.9rem;margin:.25rem 0 0}.assembly-area{flex:1;display:flex;justify-content:center;align-items:center;position:relative;padding:1rem}.runway{position:absolute;bottom:0;left:0;right:0;height:60px;background:linear-gradient(180deg,#37415180,#1f2937cc);border-top:2px solid rgba(255,255,255,.1)}.runway:before{content:"";position:absolute;top:50%;left:5%;right:5%;height:3px;background:repeating-linear-gradient(90deg,rgba(255,255,255,.3) 0,rgba(255,255,255,.3) 40px,transparent 40px,transparent 80px);transform:translateY(-50%)}.plane-container{position:relative;width:600px;height:300px;z-index:1}.slot{position:absolute;border:2px dashed rgba(96,165,250,.3);border-radius:8px;background:#60a5fa08;transition:all .3s ease;display:flex;align-items:center;justify-content:center}.slot:hover{border-color:#60a5fa99;background:#60a5fa14}.slot.filled{border:2px solid rgba(34,197,94,.4);background:transparent}.slot-label{font-size:.7rem;color:#ffffff4d;text-transform:uppercase;letter-spacing:.1em;pointer-events:none}.parts-tray{background:#111827e6;border-top:1px solid rgba(255,255,255,.08);padding:1.25rem 1.5rem;display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.part-btn{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.75rem 1.25rem;background:#ffffff0a;border:1px solid rgba(255,255,255,.1);border-radius:12px;cursor:pointer;transition:all .2s ease;color:#fafafa;font-family:inherit;-webkit-user-select:none;user-select:none}.part-btn:hover:not(.disabled){background:#60a5fa1f;border-color:#60a5fa66;transform:translateY(-2px)}.part-btn.selected{background:#60a5fa33;border-color:#60a5fa;box-shadow:0 0 20px #60a5fa33}.part-btn.disabled{opacity:.3;cursor:default}.part-icon{font-size:1.8rem}.part-name{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:#fff9}.placed-part{position:absolute;display:flex;align-items:center;justify-content:center;animation:popIn .4s cubic-bezier(.175,.885,.32,1.275);filter:drop-shadow(0 2px 8px rgba(96,165,250,.3))}@keyframes popIn{0%{transform:scale(.3);opacity:0}to{transform:scale(1);opacity:1}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.plane-complete{animation:float 3s ease-in-out infinite}.progress-bar{width:100%;max-width:400px;height:4px;background:#ffffff14;border-radius:2px;margin:.75rem auto 0;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#3b82f6,#8b5cf6);border-radius:2px;transition:width .5s ease}.celebration{position:fixed;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#000000b3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;animation:fadeIn .5s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.celebration h2{font-size:2.5rem;background:linear-gradient(135deg,#fbbf24,#f59e0b,#fbbf24);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.celebration p{color:#ffffffb3;margin:.5rem 0 1.5rem}.reset-btn{padding:.75rem 2rem;background:linear-gradient(135deg,#3b82f6,#8b5cf6);border:none;border-radius:8px;color:#fff;font-family:inherit;font-size:1rem;cursor:pointer;transition:transform .2s}.reset-btn:hover{transform:scale(1.05)}.confetti{position:absolute;width:8px;height:8px;border-radius:50%;animation:confettiFall linear forwards}@keyframes confettiFall{0%{transform:translateY(-100vh) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}.skyline{position:absolute;bottom:60px;left:0;right:0;height:120px;opacity:.15;pointer-events:none}.building{position:absolute;bottom:0;background:#ffffff4d;border-radius:2px 2px 0 0}