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24px;color:#666;font-size:14px;line-height:1.5}.welcome-close{background:var(--primary-color);color:#fff;border:none;padding:10px 24px;border-radius:6px;cursor:pointer;font-size:14px;transition:background .2s}.welcome-close:hover{background:var(--secondary-color)}.loading-hint{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:rgba(0,0,0,.8);color:#fff;padding:12px 16px;border-radius:8px;z-index:1000;display:flex;align-items:center;gap:12px}.loading-hint .spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top:2px solid white;border-radius:50%;animation:spin 1s linear infinite}.loading-hint .hint-text{font-size:14px}@keyframes swipeHint{0%{transform:translateY(-50%) translate(0);opacity:.35}50%{transform:translateY(-50%) translate(6px);opacity:.9}to{transform:translateY(-50%) translate(0);opacity:.35}}@keyframes slideUp{0%{transform:translate(-50%) translateY(100%);opacity:0}to{transform:translate(-50%) translateY(0);opacity:1}}@media (max-width: 768px){.control-panel{top:10px;left:10px;right:10px;width:auto;transform:none;border-radius:16px}.panel-header{padding:10px 12px}.control-panel.is-expanded .panel-body{display:block;padding:10px 12px 12px;max-height:calc(100vh - 80px - env(safe-area-inset-top) - env(safe-area-inset-bottom));overflow-y:auto;-webkit-overflow-scrolling:touch}.control-panel.is-expanded .panel-content{display:grid;grid-template-columns:1fr;gap:10px;overflow:visible;padding:0;margin:0}.control-panel.is-expanded .panel-content:before,.control-panel.is-expanded .panel-content:after{content:none}@media (max-width: 420px){.control-panel.is-expanded .panel-content{grid-auto-flow:column;grid-auto-columns:minmax(260px,86vw);grid-template-columns:unset;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;scroll-snap-type:x mandatory;padding:0 14px 10px;margin:0 -14px;scroll-padding-left:14px;scroll-padding-right:14px}.control-panel.is-expanded .panel-content>.control-group{scroll-snap-align:start}.control-panel.is-expanded .panel-content:after{content:"";position:sticky;right:0;top:0;height:100%;width:44px;pointer-events:none;z-index:3;background:linear-gradient(270deg,rgba(255,255,255,.92),rgba(255,255,255,0))}.control-panel.is-expanded .panel-content:before{content:"»";position:sticky;right:12px;top:50%;transform:translateY(-50%);pointer-events:none;z-index:4;color:#0e55a98c;font-size:18px;font-weight:800;animation:swipeHint 1.2s ease-in-out infinite;text-shadow:0 6px 18px rgba(15,23,42,.08)}}.control-panel.is-expanded .panel-info{min-width:0;height:auto}.button-group{grid-template-columns:repeat(3,minmax(0,1fr))}.control-btn{padding:9px 10px}.control-panel .building-select{height:38px}.control-group:has(#show-shadows) .checkbox-group{grid-template-columns:1fr}}@media (max-width: 390px){.control-panel{top:8px;left:8px;right:8px}.panel-title{font-size:13px}.toggle-btn{padding:6px 10px}.button-group{grid-template-columns:repeat(2,minmax(0,1fr))}}.welcome-banner{position:fixed;top:20px;left:50%;transform:translate(-50%);background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:12px;box-shadow:var(--shadow);z-index:1000;animation:slideDown .5s ease-out;min-width:400px}.welcome-content{padding:24px;text-align:center}.welcome-content h2{margin:0 0 12px;color:var(--text-color);font-size:20px;font-weight:600}.welcome-content p{margin:0 0 16px;color:#666;font-size:14px;line-height:1.5}.controls-hint{display:flex;justify-content:center;gap:16px;margin-bottom:20px;flex-wrap:wrap}.controls-hint span{font-size:12px;color:#888;background:#f8f9fa;padding:4px 8px;border-radius:6px}.controls-hint kbd{background:#e9ecef;padding:2px 6px;border-radius:3px;font-family:monospace;font-size:11px;margin-right:4px}.close-welcome{background:var(--primary-color);color:#fff;border:none;padding:10px 24px;border-radius:6px;cursor:pointer;font-size:14px;transition:background .2s}.close-welcome:hover{background:var(--secondary-color)}.help-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,.7);display:flex;align-items:center;justify-content:center;z-index:2000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.help-content{background:white;border-radius:12px;padding:32px;max-width:500px;max-height:80vh;overflow-y:auto;box-shadow:0 10px 40px #0000004d}.help-content h3{margin:0 0 16px;color:var(--text-color);font-size:18px;font-weight:600}.help-content ul{margin:0 0 20px;padding-left:20px}.help-content li{margin-bottom:8px;line-height:1.5}.help-content kbd{background:#f8f9fa;padding:2px 6px;border-radius:3px;font-family:monospace;font-size:12px;border:1px solid #dee2e6}.close-help{background:var(--primary-color);color:#fff;border:none;padding:10px 24px;border-radius:6px;cursor:pointer;font-size:14px;transition:background .2s;float:right}.close-help:hover{background:var(--secondary-color)}.performance-panel{position:fixed;top:20px;right:20px;background:rgba(0,0,0,.8);color:#0f0;font-family:monospace;font-size:12px;padding:12px 16px;border-radius:6px;z-index:100;pointer-events:none;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.performance-panel div{margin-bottom:4px;white-space:nowrap}.performance-panel div:last-child{margin-bottom:0}.building-hover{opacity:.8;transition:opacity .3s ease}.building-selected{outline:2px solid var(--accent-outline);outline-offset:2px}@media (max-width: 768px){.welcome-banner{left:10px;right:10px;transform:none;min-width:auto}.controls-hint{gap:8px}.controls-hint span{font-size:11px}.help-content{margin:20px;padding:24px}.performance-panel{top:10px;right:10px;font-size:11px;padding:8px 12px}}::-webkit-scrollbar{display:none}