.physics-article .lead-block{margin-top:30px}.physics-article .prose-block{margin-bottom:34px}.physics-article .prose-block h2{margin:6px 0 10px}.physics-article .diagram-block{margin:37px 0}.physics-concept{margin:36px 0;padding:24px 27px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.physics-concept h2{font-size:22px;margin:7px 0 11px}.physics-concept p{font-size:16px;line-height:1.9;margin:0}.physics-formula{margin:0 0 35px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.physics-formula summary{list-style:none;padding:18px 21px;cursor:pointer;color:var(--accent);font-weight:700;display:flex;justify-content:space-between}.physics-formula summary::-webkit-details-marker{display:none}.physics-formula summary span{font-size:12px;color:var(--soft)}.physics-formula-inner{padding:0 23px 23px}.physics-equation{display:inline-block;font-size:clamp(22px,3vw,30px);font-weight:700;letter-spacing:.03em;color:var(--text);padding:14px 20px;border-radius:8px;background:var(--surface2)}.physics-formula dl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 20px;margin:17px 0}.physics-formula dl>div{display:flex;gap:12px;border-bottom:1px solid var(--line);padding:7px 0}.physics-formula dt{color:var(--accent);font-weight:700;min-width:75px}.physics-formula dd{margin:0;color:var(--muted)}.physics-formula p{font-size:14px;margin:12px 0 0}.physics-cosmos{margin:29px 0 37px;padding:21px 24px;background:linear-gradient(130deg,#112d3b,#0b1b2a);border-radius:12px;border:1px solid #385263}.physics-cosmos p{color:#dce8e9;font-size:16px;line-height:1.85;margin:8px 0 0}.physics-related-bodies{margin:38px 0}.physics-related-bodies h2{font-size:19px;margin-bottom:12px}.physics-related-bodies>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.physics-map-link{display:block;color:var(--accent);font-size:13px;font-weight:700;margin-top:14px}
.physics-svg{display:block;width:100%;height:auto;max-height:330px;touch-action:none}.physics-svg text{font-family:'Noto Sans SC','Microsoft YaHei',system-ui,sans-serif;font-size:15px;fill:var(--muted)}.physics-static{background:var(--surface2);border-radius:9px;margin-top:10px}.physics-demo{margin-top:8px}.physics-controls{border-top:1px solid var(--line);padding:16px 4px 4px}.physics-options,.physics-actions{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 12px}.physics-options button,.physics-actions button,.physics-controls>button{border:1px solid var(--line);border-radius:8px;background:var(--surface2);color:var(--text);min-height:41px;padding:8px 13px;font-size:13px;font-weight:700}.physics-options button[aria-pressed=true],.physics-actions button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);background:#78d7c318}.physics-options button:hover,.physics-actions button:hover,.physics-controls>button:hover{border-color:var(--accent)}.physics-slider{display:grid;grid-template-columns:1fr minmax(180px,49%);gap:12px;align-items:center;font-size:14px;font-weight:700;color:var(--text);margin:8px 0}.physics-slider input{width:100%;accent-color:var(--accent);min-height:33px}.physics-result{padding:11px 14px;background:var(--surface2);border-radius:8px;color:var(--text);font-size:15px;line-height:1.7;min-height:48px;margin:11px 0 5px}.physics-note{display:block;color:var(--soft);font-size:12px;line-height:1.65}.physics-demo[data-physics=path] [data-path-person]{cursor:grab}.physics-demo[data-physics=path] [data-path-person]:active{cursor:grabbing}.physics-demo[data-physics=coaster] [data-coaster-car]{cursor:grab}.physics-demo[data-physics=coaster] [data-coaster-car]:focus-visible{outline:2px solid var(--accent)}
[data-brake-car]{transition:transform var(--brake-time,.9s) cubic-bezier(.08,.5,.3,1)}[data-brake-passenger]{transform-box:fill-box;transform-origin:50% 95%;transition:transform .25s ease .12s}.physics-demo[data-physics=brake][data-played=true] [data-brake-car]{transform:translateX(245px)}.physics-demo[data-physics=brake][data-played=true] [data-brake-passenger]{transform:rotate(var(--lean,14deg))}.physics-demo[data-physics=drop] [data-drop-ball],.physics-demo[data-physics=drop] [data-drop-feather]{transition:transform .9s ease-in}.physics-demo[data-physics=drop][data-played=true] [data-drop-ball]{transform:translateY(154px)}.physics-demo[data-physics=drop][data-played=true] [data-drop-feather]{transform:translateY(154px);transition-duration:2.1s}.physics-demo[data-physics=drop][data-played=true]:has([data-phys-option=vacuum][aria-pressed=true]) [data-drop-feather]{transition-duration:.9s}
.gravity-meter{display:grid;grid-template-columns:100px 1fr auto;gap:12px;align-items:center;font-size:13px;color:var(--muted);margin:19px 0 15px}.gravity-meter>div{height:10px;border-radius:9px;background:var(--line);overflow:hidden}.gravity-meter i{display:block;height:100%;background:var(--accent);border-radius:9px;transition:width .18s}.gravity-meter strong{color:var(--text)}.energy-bars{display:grid;gap:9px;margin:13px 0 16px}.energy-bars>div{display:grid;grid-template-columns:92px 1fr;gap:10px;align-items:center;font-size:13px;color:var(--muted)}.energy-bars b{height:9px;background:var(--line);border-radius:8px;overflow:hidden}.energy-bars i{display:block;width:0;height:100%;background:#78d7c3;transition:width .08s linear}.energy-bars [data-energy-kinetic]{background:#f0c479}.energy-bars [data-energy-other]{background:#9db4d6}.energy-bars [data-energy-total]{background:#d6dfeb}
@media(max-width:760px){.physics-related-bodies>div{grid-template-columns:1fr 1fr}.physics-formula dl{grid-template-columns:1fr}.physics-concept{padding:19px}}
@media(max-width:520px){.physics-related-bodies>div{grid-template-columns:1fr}.physics-slider{grid-template-columns:1fr;gap:2px}.gravity-meter{grid-template-columns:1fr auto}.gravity-meter>div{grid-column:1/-1;grid-row:2}.physics-svg text{font-size:12px}.physics-cosmos{padding:18px}}
@media(prefers-reduced-motion:reduce){[data-brake-car],[data-brake-passenger],[data-drop-ball],[data-drop-feather]{transition-duration:.01ms!important}.energy-bars i{transition:none}}
.physics-demo.drop-resetting [data-drop-ball],.physics-demo.drop-resetting [data-drop-feather]{transition:none!important}
.physics-demo[data-physics=station]:not([data-paused=true]) [data-station-gravity],.physics-demo[data-physics=station]:not([data-paused=true]) [data-station-velocity]{opacity:0}
.physics-home-section{border-top:1px solid var(--line);padding-top:36px}.physics-home-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.physics-home-grid a{display:flex;flex-direction:column;min-height:155px;border:1px solid var(--line);border-radius:13px;padding:18px 20px;background:var(--surface)}.physics-home-grid a:hover{border-color:var(--accent);transform:translateY(-2px)}.physics-home-grid small{color:var(--soft);font-size:11px;letter-spacing:.12em}.physics-home-grid strong{font-size:19px;margin-top:8px}.physics-home-grid span{color:var(--muted);font-size:13px}.physics-home-grid b{color:var(--accent);font-size:12px;margin-top:auto;padding-top:8px}
@media(max-width:760px){.physics-home-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.physics-home-grid{grid-template-columns:1fr}.physics-home-grid a{min-height:125px}}