@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Noto+Sans+SC:wght@400;500;600&family=Noto+Serif+SC:wght@500;600&display=swap");
:root{--bg:#081019;--panel:#0d1722;--raised:#132131;--line:#344a60;--ink:#f2f6fb;--muted:#acbdce;--blue:#79b7eb;--green:#75c6a3;--amber:#e3b66e;--danger:#e47a82;--mono:"IBM Plex Mono",Consolas,monospace;--sans:"Noto Sans SC","Microsoft YaHei UI",sans-serif;--serif:"Noto Serif SC",serif}*{box-sizing:border-box}html{color-scheme:dark}body{margin:0;color:var(--ink);background:radial-gradient(circle at 80% 8%,rgba(85,142,195,.12),transparent 32rem),linear-gradient(rgba(121,183,235,.025) 1px,transparent 1px),var(--bg);background-size:auto,100% 52px,auto;font:16px var(--sans)}a{color:inherit;text-decoration:none}button,select{color:var(--ink);font:13px var(--sans)}
.site-header{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 clamp(22px,5vw,72px);border-bottom:1px solid var(--line);background:#081019ef}.brand,.site-header nav{display:flex;align-items:center;gap:22px}.brand{gap:12px;font:600 12px var(--mono)}.brand-mark{width:30px;height:30px;display:grid;place-items:center;border:1px solid var(--blue);border-radius:50%;color:var(--blue)}.site-header nav a{color:var(--muted);font-size:14px}.site-header nav a:hover{color:var(--ink)}main{width:min(1580px,calc(100% - 40px));margin:auto}.hero{min-height:315px;display:grid;grid-template-columns:1.25fr .75fr;align-items:end;gap:64px;padding:72px 0 46px}.eyebrow,.panel-label{color:var(--blue);font:600 12px var(--mono);letter-spacing:.1em}.hero h1{margin:16px 0 0;font:500 clamp(44px,6vw,80px)/1.16 var(--serif);letter-spacing:-.04em}.hero h1 em{color:var(--green);font-style:normal}.hero p{margin:0;color:var(--muted);font-size:17px;line-height:1.9}
.lab{overflow:hidden;margin-bottom:64px;border:1px solid #4c657e;border-radius:12px;background:#0a141e;box-shadow:0 34px 90px #0007}.lab-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;padding:21px 26px;border-bottom:1px solid var(--line)}.lab-head h2{margin:6px 0 0;font:500 24px var(--serif)}.step-readout{display:flex;gap:14px;font:500 13px var(--mono)}.step-readout span{color:var(--blue)}.step-readout strong{color:var(--muted)}.case-tabs{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line)}.case-tab{min-height:58px;border:0;border-right:1px solid var(--line);background:#0c1721;color:var(--muted);cursor:pointer}.case-tab:last-child{border-right:0}.case-tab:hover{color:var(--ink);background:#132434}.case-tab.is-active,.case-tab[aria-pressed=true]{color:var(--ink);background:#172a3b;box-shadow:inset 0 -3px var(--blue)}
.lenses{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line)}.lenses article{padding:17px 20px;border-right:1px solid var(--line)}.lenses article:last-child{border-right:0}.lenses span{color:var(--blue);font:600 12px var(--mono)}.lenses p{margin:8px 0 0;color:#c8d4e1;font-size:13px;line-height:1.7}.lab-grid{display:grid;grid-template-columns:300px minmax(620px,1fr) 340px;min-height:720px}.explain,.visual,.inspect{min-width:0;padding:28px}.explain,.visual{border-right:1px solid var(--line)}.explain{display:flex;flex-direction:column}.phase{color:var(--blue);font:600 12px var(--mono)}.explain h2{margin:15px 0;font:500 34px/1.3 var(--serif)}.explain>p{margin:0;color:#d4dee9;font-size:15px;line-height:1.85}.change,.why{margin-top:22px;padding:15px 16px;border-left:2px solid var(--blue);background:#101f2c}.why{border-left-color:var(--green)}.change span,.why span{color:var(--blue);font:600 12px var(--mono)}.why span{color:var(--green)}.change p,.why p{margin:8px 0 0;color:var(--muted);font-size:14px;line-height:1.7}.explain>a{margin-top:auto;padding-top:26px;color:var(--blue);font:500 13px var(--mono)}.explain>a:hover{color:var(--ink)}
.visual{background:radial-gradient(circle at 50% 18%,rgba(80,139,190,.1),transparent 25rem),#0b1621}.visual-head{display:flex;justify-content:space-between;gap:18px}.visual-head h2{margin:6px 0 0;font:500 25px var(--serif)}.visual-head>strong{color:var(--green);font:600 14px var(--mono)}.entity-gate{display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:12px;margin-top:24px;padding:14px 16px;border:1px solid var(--line);border-radius:8px;background:#0e1c29}.entity-gate span{color:var(--muted);font:600 12px var(--mono)}.entity-gate strong{padding:4px 9px;border-radius:999px;background:#26394c;font:600 12px var(--mono)}.entity-gate strong.is-dirty{color:#10161d;background:var(--amber)}.entity-gate small{color:var(--muted);font-size:12px;line-height:1.5}.attribute-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}.attribute-card{padding:13px;border:1px solid var(--line);border-radius:8px;background:#101e2b}.attribute-card.is-dirty{border-color:var(--amber);box-shadow:inset 3px 0 var(--amber)}.attribute-card.is-focus{border-color:var(--blue);box-shadow:inset 3px 0 var(--blue)}.attribute-card header{display:flex;justify-content:space-between;gap:10px}.attribute-card h3{margin:0;font-size:14px}.attribute-card header span{color:var(--muted);font:600 12px var(--mono)}.attribute-card dl{display:grid;grid-template-columns:1fr auto;gap:7px;margin:12px 0 0}.attribute-card dt{color:var(--muted);font-size:12px}.attribute-card dd{margin:0;font:500 12px var(--mono)}.effect-panel{margin-top:14px;padding:14px;border:1px solid var(--line);border-radius:8px;background:#0d1925}.effect-panel>span{color:var(--blue);font:600 12px var(--mono)}.effect-panel ul,.event-log{margin:10px 0 0;padding:0;list-style:none}.effect-panel li{display:flex;justify-content:space-between;gap:12px;margin-top:7px;padding:8px 10px;border:1px solid #32475b;border-radius:6px;background:#132230;color:#d5dfeb;font-size:13px}.effect-panel li.is-invalid{border-color:#9b545a;color:#ffcbd0}.effect-panel li.is-inactive{opacity:.58}.event-log{max-height:150px;overflow:auto}.event-log li{margin-top:6px;padding:8px 10px;border-left:3px solid #6685a3;background:#122130;color:#cbd8e5;font-size:12px;line-height:1.55}.event-log li.is-error{border-left-color:var(--danger);color:#ffd0d4}.event-log li.is-success{border-left-color:var(--green);color:#c3ead8}
.inspect{display:flex;flex-direction:column;background:#0b151f}.inspect dl{display:grid;gap:8px;margin:16px 0}.inspect dl div{display:grid;grid-template-columns:1fr auto;gap:12px;padding:9px 10px;border:1px solid #2f4357;border-radius:6px;background:#101d29}.inspect dt{color:var(--muted);font-size:12px}.inspect dd{margin:0;text-align:right;font:500 12px var(--mono)}.code{margin-top:auto;overflow:hidden;border:1px solid var(--line);border-radius:7px;background:#071019}.code>div{display:flex;justify-content:space-between;gap:10px;padding:10px 12px;border-bottom:1px solid var(--line);color:var(--muted);font:12px var(--mono)}.code>div strong{color:var(--blue)}#code-lines{margin:0;padding:13px 12px 13px 45px;overflow:auto;color:#9fb1c4;font:12px/1.72 var(--mono);white-space:pre}#code-lines li{min-width:max-content;padding:1px 7px}#code-lines li.is-active{color:var(--ink);background:#183047;box-shadow:inset 2px 0 var(--blue)}
.controls{display:grid;grid-template-columns:150px 1fr auto;align-items:end;gap:18px;padding:17px 22px;border-top:1px solid var(--line);background:#0d1924}.controls label{display:grid;gap:6px;color:var(--muted);font:500 12px var(--mono)}select{min-height:38px;padding:0 10px;border:1px solid #4c647c;border-radius:5px;background:#101f2c}.controls>div:nth-child(2){display:flex;justify-content:center;gap:7px;padding-bottom:12px}.lab-dot{width:12px;height:12px;padding:0;border:1px solid #66819b;border-radius:50%;background:transparent;cursor:pointer}.lab-dot:hover{border-color:var(--ink)}.lab-dot.is-past{background:#416889}.lab-dot.is-active{border-color:var(--blue);background:var(--blue)}.controls>div:last-child{display:flex;gap:8px}.controls button{min-height:42px;padding:0 15px;border:1px solid #4d657d;border-radius:5px;background:#142331;cursor:pointer}.controls button:hover:not(:disabled){border-color:var(--blue);background:#1b3044}.controls button:disabled{opacity:.38;cursor:not-allowed}.auto-button.is-playing,.auto-button[aria-pressed=true]{color:#10161d;border-color:var(--amber);background:var(--amber)}.next-button{color:#091019!important;border-color:var(--blue)!important;background:var(--blue)!important;font-weight:600}.keyboard-hint{margin:0;padding:10px 22px 14px;border-top:1px solid #23374a;background:#0b151f;color:#8fa2b5;font-size:12px}a:focus-visible,button:focus-visible,select:focus-visible,.lab:focus-visible{outline:2px solid var(--blue);outline-offset:3px}.status-error{color:#ffcbd0!important}.status-success{color:#c3ead8!important}
@media(max-width:1240px){.lab-grid{grid-template-columns:280px 1fr}.inspect{grid-column:1/-1;display:grid;grid-template-columns:.7fr 1.3fr;gap:22px;border-top:1px solid var(--line)}.code{margin-top:0}.lenses{grid-template-columns:repeat(2,1fr)}}@media(max-width:900px){.attribute-grid{grid-template-columns:1fr}.case-tabs{grid-template-columns:repeat(2,1fr)}}@media(max-width:780px){main{width:calc(100% - 24px)}.site-header{align-items:flex-start;padding:16px 18px}.site-header nav{flex-wrap:wrap;justify-content:flex-end;gap:12px 18px}.hero{min-height:0;grid-template-columns:1fr;gap:22px;padding:50px 0 34px}.hero h1{font-size:clamp(38px,12vw,58px)}.lenses{grid-template-columns:1fr}.lenses article{border-right:0;border-bottom:1px solid var(--line)}.lab-grid{display:block}.explain,.visual{border-right:0;border-bottom:1px solid var(--line)}.inspect{display:flex}.controls{grid-template-columns:1fr}.controls>div:nth-child(2){order:-1}.controls>div:last-child{display:grid;grid-template-columns:1fr 1fr}}@media(max-width:500px){.site-header{display:block}.site-header nav{margin-top:14px;justify-content:flex-start}.case-tabs{grid-template-columns:1fr}.case-tab{border-right:0;border-bottom:1px solid var(--line)}.lab-head,.visual-head{align-items:flex-start;flex-direction:column}.explain,.visual,.inspect{padding:20px}.entity-gate{grid-template-columns:1fr}.controls>div:last-child{grid-template-columns:1fr}}