:root{--bg:#050815;--panel:#0c1326;--panel2:#111c34;--line:#253556;--text:#edf5ff;--muted:#9fb0c9;--cyan:#3ee7ff;--blue:#2196ff;--purple:#aa83ff;--gold:#ffc857;--green:#70f0b1;--red:#ff6b8a;--radius:16px;font-family:Inter,Segoe UI,Arial,sans-serif;color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 50% 0,#101c3d 0,#050815 42%);color:var(--text);min-height:100vh}.site-header{height:68px;padding:0 clamp(18px,5vw,72px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #26314d;background:#050817e8;backdrop-filter:blur(12px);position:sticky;top:0;z-index:20}.brand{color:var(--text);text-decoration:none;letter-spacing:.16em;font-weight:800}.brand strong{color:var(--cyan)}nav{display:flex;gap:24px}nav a{color:var(--muted);text-decoration:none}nav a:hover,nav a:focus{color:var(--text)}main{width:min(1500px,94vw);margin:auto}.breadcrumb{padding:22px 0 4px;display:flex;gap:8px;flex-wrap:wrap;font-size:.86rem}.hero{padding:34px 0 30px}.hero p{color:var(--cyan);font-size:.74rem;font-weight:800;letter-spacing:.14em}.hero h1{font-size:clamp(2.1rem,5vw,4rem);margin:.2em 0}.hero span{color:var(--muted);font-size:1.08rem}.laboratory{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:18px}.visual-column,.controls,.plots article,.learn article,.speed-panel,.equation-panel{background:linear-gradient(145deg,#0c1326e8,#081020e8);border:1px solid var(--line);border-radius:var(--radius)}.stage-bar{padding:14px 18px;display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line)}.stage-bar span{font-weight:700}.stage-bar .below{color:var(--red)}.stage-bar .near{color:var(--gold)}.stage-bar .strong{color:var(--cyan)}.canvas-wrap{height:clamp(470px,58vw,700px);position:relative;overflow:hidden;background:#02050e;border-bottom:1px solid var(--line)}#simulation{width:100%;height:100%;display:block}.legend{display:flex;flex-wrap:wrap;gap:15px;padding:11px 16px;color:var(--muted);font-size:.78rem;border-bottom:1px solid var(--line)}.legend i{width:18px;height:3px;display:inline-block;margin-right:6px;vertical-align:middle}.particle{background:var(--gold);height:6px!important}.wave{border-top:2px solid var(--cyan)}.cone{background:linear-gradient(90deg,var(--blue),var(--cyan));height:5px!important}.threshold{border-top:2px dashed var(--red)}.metrics{display:grid;grid-template-columns:repeat(6,minmax(90px,1fr));border-bottom:1px solid var(--line)}.metrics div{padding:12px 14px;border-right:1px solid var(--line)}.metrics div:last-child{border:0}.metrics span{display:block;color:var(--muted);font-size:.72rem;margin-bottom:5px}.metrics strong{font-size:.94rem}.plots{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:12px}.plots article{padding:12px;border-radius:10px}.plots h2{font-size:.82rem;margin:0 0 8px;color:var(--muted);font-weight:600}.plots canvas{width:100%;height:165px;display:block}.controls{padding:15px;align-self:start;position:sticky;top:86px;max-height:calc(100vh - 104px);overflow:auto}.button-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-bottom:15px}button,select,input[type=number]{font:inherit;color:var(--text);background:#101b32;border:1px solid #314363;border-radius:8px;padding:9px}button{cursor:pointer}button:hover,button:focus{border-color:var(--cyan)}button.primary{background:linear-gradient(135deg,#127a9a,#5d4fc2);border-color:#51ddfa;font-weight:700}.controls>label{display:block;color:var(--muted);font-size:.78rem;margin:11px 0}.controls select,.controls input[type=number]{display:block;width:100%;margin-top:5px}.controls output{float:right;color:var(--text)}input[type=range]{display:block;width:100%;margin-top:8px;accent-color:var(--cyan)}.switches{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:15px 0;color:var(--muted);font-size:.75rem}.switches input{accent-color:var(--cyan)}.warning{color:#d2b8ff;background:#221939;border:1px solid #493a70;border-radius:10px;padding:12px;font-size:.76rem}.speed-panel{margin:18px 0;padding:18px}.speed-panel h2,.equation-panel h2{font-size:1rem;margin:0 0 14px}.scale{position:relative;height:58px;margin:0 10px 8px}.scale-line{position:absolute;left:0;right:0;top:28px;height:4px;background:#263a59;border-radius:4px}.marker{position:absolute;top:14px;transform:translateX(-50%);text-align:center;font-size:.72rem}.marker::after{content:"";display:block;width:3px;height:25px;background:currentColor;margin:3px auto}.marker.particle-speed{color:var(--cyan)}.marker.medium-speed{color:var(--gold)}.marker.vacuum-speed{color:var(--red);left:100%}.scale-labels{display:flex;justify-content:space-between;color:var(--muted);font-size:.72rem}.equation-panel{padding:18px;margin:18px 0}.equations{display:flex;gap:30px;flex-wrap:wrap;color:var(--cyan);font-size:1.1rem}.learn{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:18px 0 40px}.learn article{padding:20px}.learn h2{margin-top:0;font-size:1.05rem}.learn p,.warning{line-height:1.6;color:var(--muted)}@media(max-width:1050px){.laboratory{grid-template-columns:1fr}.controls{position:static;max-height:none}.metrics{grid-template-columns:repeat(3,1fr)}}@media(max-width:680px){.site-header{height:auto;padding:14px 18px;align-items:flex-start;gap:12px;flex-direction:column}.site-header nav{gap:15px;flex-wrap:wrap}.hero{padding:24px 0}.canvas-wrap{height:420px}.metrics{grid-template-columns:repeat(2,1fr)}.plots,.learn{grid-template-columns:1fr}.switches{grid-template-columns:1fr}.controls{padding:12px}.marker{font-size:.65rem}.equations{font-size:.95rem}}
footer{padding:30px;text-align:center;color:var(--muted);border-top:1px solid var(--line)}