:root{color-scheme:dark;--bg: #090d18;--panel: rgba(13, 19, 34, .88);--line: rgba(184, 204, 255, .18);--text: #e8edff;--muted: #98a4c2;--accent: #80a9ff;--accent-soft: rgba(128, 169, 255, .16);--good: #7fe0b5;font-family:Inter,Segoe UI,Microsoft YaHei,system-ui,sans-serif}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg)}body{overflow:hidden;color:var(--text)}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.app-shell{position:relative;width:100vw;height:100vh;overflow:hidden;background:radial-gradient(circle at 50% 20%,#18243f 0,var(--bg) 58%)}#viewer{position:absolute;inset:0}#viewer canvas{display:block;width:100%;height:100%}.title-card,.control-panel,.info-panel,.hint,#loading,#error{position:absolute;z-index:4;border:1px solid var(--line);background:var(--panel);box-shadow:0 18px 50px #00000047;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.title-card{top:22px;left:22px;width:min(360px,calc(100vw - 44px));padding:18px 20px;border-radius:18px}.eyebrow,.section-label{color:var(--muted);font-size:10px;letter-spacing:.14em;text-transform:uppercase}.title-card h1{margin:7px 0 3px;font-size:25px;letter-spacing:-.02em}.title-card p{margin:0;color:var(--muted);font-size:12px}.control-panel{top:22px;right:22px;width:min(310px,calc(100vw - 44px));padding:13px;border-radius:16px}.control-section+.control-section{margin-top:13px}.button-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:7px}.button-row button,.level-button{min-height:31px;padding:6px 10px;border:1px solid var(--line);border-radius:9px;background:#ffffff09;color:var(--text);font-size:12px;transition:.16s ease}.button-row button:hover,.level-button:hover{border-color:var(--accent);background:var(--accent-soft)}.button-row button.active,.level-button.active{border-color:var(--accent);background:var(--accent-soft);color:#fff}.toggles{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;color:var(--muted);font-size:12px}.toggles label{display:flex;align-items:center;gap:6px}.toggles input{accent-color:var(--accent)}.read-only-note{margin-top:13px;padding-top:10px;border-top:1px solid var(--line);color:var(--good);font-size:10px;line-height:1.45}.info-panel{left:22px;bottom:22px;width:min(290px,calc(100vw - 44px));padding:13px 16px;border-radius:14px}.info-title{margin-bottom:7px;font-size:12px;font-weight:700}#scene-stats{display:grid;grid-template-columns:1fr auto;gap:4px 16px;margin:0;font-size:11px}#scene-stats dt{color:var(--muted)}#scene-stats dd{margin:0;color:var(--text);text-align:right}.hint{right:22px;bottom:22px;padding:9px 12px;border-radius:10px;color:var(--muted);font-size:11px}#loading{inset:50% auto auto 50%;transform:translate(-50%,-50%);padding:12px 16px;border-radius:12px;color:var(--muted);font-size:12px}#loading.hidden{display:none}#error{inset:50% auto auto 50%;transform:translate(-50%,-50%);width:min(520px,calc(100vw - 44px));padding:16px 18px;border-color:#ff787859;border-radius:14px;color:#ffd7d7;font-size:13px;line-height:1.55}@media(max-width:780px){body{overflow:auto}.app-shell{min-height:100vh;height:100dvh}.title-card{top:12px;left:12px}.control-panel{inset:auto 12px 12px;width:auto;max-height:42vh;overflow:auto}.info-panel,.hint{display:none}}