:root{--bg: #0b0d18;--panel: rgba(14, 18, 36, .88);--border: rgba(150, 170, 255, .3);--accent: #ffd60a;--text: #eef0fa;--muted: #a5adc8}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,sans-serif;background:var(--bg);color:var(--text);overflow:hidden}#app{width:100vw;height:100vh;position:relative}#scene{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block}#topbar{position:absolute;top:0;left:0;right:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;flex-wrap:wrap;background:linear-gradient(to bottom,rgba(11,13,24,.92),transparent)}#topbar .left{display:flex;align-items:center;gap:10px}#back-link{color:var(--muted);text-decoration:none;font-size:20px;border:1px solid var(--border);border-radius:8px;padding:2px 10px}#back-link:hover{color:var(--accent);border-color:var(--accent)}h1{font-size:16px}#modes{display:flex;gap:6px}.mode-btn,.lang-switch button,#swap-btn,select{background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:99px;padding:6px 14px;font-size:13px;cursor:pointer}.mode-btn.active{background:var(--accent);border-color:var(--accent);color:#1a1500;font-weight:700}.lang-switch{display:flex;gap:4px}.lang-switch button.active{background:var(--accent);color:#1a1500;font-weight:700}#hint{position:absolute;top:58px;left:50%;transform:translate(-50%);z-index:9;font-size:13px;color:var(--muted);background:var(--panel);border:1px solid var(--border);border-radius:99px;padding:6px 16px;max-width:92vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#tir-banner{position:absolute;top:100px;left:50%;transform:translate(-50%);z-index:11;background:#ffd60a24;border:1px solid var(--accent);color:var(--accent);border-radius:12px;padding:10px 18px;font-size:14px;font-weight:600;max-width:min(560px,92vw);text-align:center}#info-panel{position:absolute;left:16px;bottom:86px;z-index:10;width:340px;max-width:calc(100vw - 32px);background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:14px 16px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}#info-values{font-size:14px;line-height:1.8;font-variant-numeric:tabular-nums}#info-values .formula{color:var(--accent);font-weight:600}#info-values .row{display:flex;justify-content:space-between;gap:10px}#info-values .row .label{color:var(--muted)}#info-why{font-size:13px;color:var(--muted);line-height:1.55;margin-top:10px;border-top:1px solid var(--border);padding-top:10px}#controls{position:absolute;left:0;right:0;bottom:0;z-index:10;display:flex;align-items:center;justify-content:center;gap:16px;padding:14px 16px 18px;flex-wrap:wrap;background:linear-gradient(to top,rgba(11,13,24,.92),transparent)}#slider-wrap,#material-wrap{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);background:var(--panel);border:1px solid var(--border);border-radius:99px;padding:7px 16px}#angle-slider{width:200px;accent-color:var(--accent)}#slider-value{color:var(--text);min-width:44px;text-align:right}@media (max-width: 760px){h1{display:none}#angle-slider{width:130px}}