:root{
  color-scheme:dark;
  --bg:#0e1520;--panel:#151e2b;--panel2:#111a26;--line:#273446;--text:#f0f4f7;--muted:#a1afbf;--sub:#8091a7;
  --gold:#ffcf70;--mint:#67e5cd;--lavender:#b0a8ff;--blue:#79b8fb;--radius:16px;
  font-family:"Inter","Segoe UI",system-ui,sans-serif;font-size:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text)}
button,input,select{font:inherit}
button{cursor:pointer;color:inherit}
button:disabled{opacity:.38;cursor:default}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--gold);outline-offset:4px}
[hidden]{display:none!important}
h1,h2,h3,p{margin:0}
.wrap{width:min(1260px,calc(100% - 96px));margin-inline:auto}
.site-header{height:69px;background:#101925;border-bottom:1px solid #263244}
.header-row{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:21px;letter-spacing:-.7px;white-space:nowrap}
.brand-light{font-weight:560}
.brand-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--gold);color:#211b13}
.brand-icon svg{width:22px;height:22px}
.main-nav{display:flex;align-items:center;gap:33px;height:100%;color:var(--muted)}
.main-nav a,.main-nav button{height:100%;display:flex;align-items:center;background:none;border:0;border-bottom:2px solid transparent;padding:2px 0 0;color:inherit;font-size:13px;font-weight:640;white-space:nowrap}
.main-nav .selected{color:var(--gold);border-color:var(--gold)}
.main-nav a:hover,.main-nav button:hover{color:var(--text)}
.btn,.icon-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;border:1px solid transparent;min-height:40px;padding:0 13px;font-weight:680;white-space:nowrap;transition:background .16s,border-color .16s,color .16s}
.btn svg,.icon-btn svg,[data-icon] svg{display:block;width:17px;height:17px}
.btn.gold,.play{color:#231b0e;background:var(--gold);border-color:var(--gold)}
.btn.gold:hover,.play:hover{background:#ffde99}
.btn.outline,.icon-btn{border-color:#304055;background:#172231;color:#e5edf6}
.btn.outline:hover,.icon-btn:hover{background:#233246;border-color:#445873}
.btn.small{min-height:34px;font-size:12px}
.icon-btn{height:36px;width:36px;min-height:36px;padding:0;flex:0 0 auto}
.icon-btn[aria-pressed=true],.btn[aria-pressed=true]{color:var(--gold);border-color:#8c7143}
.icon-btn.play{background:var(--gold);border-color:var(--gold);color:#21180b;width:43px;height:38px}
.intro{display:flex;justify-content:space-between;align-items:end;gap:20px;padding:39px 0 28px}
.eyebrow{font-size:11px;letter-spacing:.17em;font-weight:820;color:var(--gold);display:flex;align-items:center;gap:8px}
.eyebrow>span{width:6px;height:6px;background:var(--gold);border-radius:2px}
.intro h1{font-size:clamp(35px,4.3vw,61px);line-height:1.08;letter-spacing:-.065em;margin:12px 0 11px;font-weight:825}
.intro h1 span{color:var(--gold)}
.intro p,.library-head p{color:var(--muted);font-size:14px;line-height:1.6}
.intro .btn{margin-bottom:3px}
.phase-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:20px}
.phase-card{display:flex;text-align:left;align-items:center;gap:11px;min-height:73px;padding:11px 13px;border:1px solid var(--line);border-radius:12px;background:var(--panel);min-width:0}
.phase-card:hover{border-color:var(--phase)}
.phase-card[aria-pressed=true]{background:var(--phase-bg);border-color:var(--phase);box-shadow:0 0 0 1px color-mix(in srgb,var(--phase),transparent 85%) inset}
.phase-icon{background:var(--phase-bg);color:var(--phase);border:1px solid color-mix(in srgb,var(--phase),transparent 72%);width:40px;height:40px;display:grid;place-items:center;border-radius:10px;flex:0 0 auto}
.phase-icon svg{width:20px;height:20px}
.phase-card strong,.phase-card small{display:block}
.phase-card strong{font-size:15px;margin-bottom:4px}
.phase-card small{color:var(--muted);font-size:11px;font-weight:520}
.phase-card .phase-count{margin-left:auto;color:var(--sub);font-size:11px;font-weight:680}
.phase-card[aria-pressed=true] strong,.phase-card[aria-pressed=true] .phase-count{color:var(--phase)}
.studio{display:grid;grid-template-columns:minmax(0,1.58fr) minmax(0,1fr);gap:16px;scroll-margin-top:16px;align-items:stretch}
.panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);min-width:0}
.viewer{overflow:hidden;display:flex;flex-direction:column;min-height:512px}
.viewer-head{display:flex;align-items:center;justify-content:space-between;padding:13px 15px 13px 18px;min-height:63px;gap:8px}
.viewer-title{display:flex;align-items:center;gap:8px}
.viewer-title h2{font-size:14px;font-weight:720;white-space:nowrap}
.live-dot{width:7px;height:7px;background:var(--mint);border-radius:50%;box-shadow:0 0 10px #67e5cd62}
.segment{display:flex;gap:2px;border:1px solid #2b374a;border-radius:9px;background:#0f1722;padding:3px}
.segment button{border:0;border-radius:6px;background:none;padding:6px 9px;color:var(--muted);font-size:12px;font-weight:680;white-space:nowrap}
.segment button[aria-pressed=true]{background:#29374a;color:#f2f5f8}
.viewport{position:relative;flex:1;min-height:352px;isolation:isolate;overflow:hidden;background:radial-gradient(ellipse at 51% 48%,#24394b 0%,#172637 39%,#111c2a 72%,#111a27 100%);border-block:1px solid var(--line)}
.viewport-grid{position:absolute;inset:0;z-index:-1;background-image:linear-gradient(#7590ab18 1px,transparent 1px),linear-gradient(90deg,#7590ab18 1px,transparent 1px);background-size:31px 31px;mask-image:radial-gradient(ellipse at center,#000 15%,transparent 82%);pointer-events:none}
.viewport canvas{display:block;position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:grab}
.viewport canvas:active{cursor:grabbing}
.view-corner{position:absolute;left:14px;bottom:14px;display:flex;align-items:center;gap:6px;font-size:11px;color:#c0cddd;background:#111a28d9;border:1px solid #34435a;padding:6px 8px;border-radius:6px;pointer-events:none}
.view-corner svg{width:13px;height:13px}
.view-tools{position:absolute;right:14px;top:14px;display:flex;gap:6px}
.view-tools .icon-btn{background:#131e2ed9}
.view-tools .track-btn{width:auto;padding:0 8px;font-size:11px}
.current-move{position:absolute;bottom:13px;right:15px;font-family:monospace;font-size:16px;font-weight:750;color:var(--gold);background:#111a28e6;border:1px solid #534a39;padding:4px 9px;border-radius:7px;pointer-events:none}
.player,.drill{padding:12px 16px}
.player-row,.drill-head{display:flex;align-items:center;gap:7px}
.player-divider{width:1px;height:24px;background:var(--line);margin:0 3px}
#move-counter{color:var(--muted);font-size:12px;font-weight:650;white-space:nowrap}
.speed-label{margin-left:auto}
.speed-label select{background:#182434;color:var(--text);border:1px solid var(--line);border-radius:7px;padding:5px 7px;min-height:34px}
#timeline{display:block;width:100%;height:12px;margin:10px 0 0;accent-color:var(--gold);cursor:pointer}
.lesson{padding:15px 18px 17px;display:flex;flex-direction:column}
.lesson-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.case-tag{color:var(--phase,var(--gold));background:var(--phase-bg,#342c22);border:1px solid color-mix(in srgb,var(--phase,var(--gold)),transparent 78%);border-radius:6px;padding:4px 7px;font-size:10px;letter-spacing:.09em;font-weight:820;line-height:1.4;text-transform:uppercase}
.bookmark{height:32px;width:32px;min-height:32px}
.lesson h2{font-size:29px;line-height:1.16;letter-spacing:-.043em;font-weight:790}
.case-desc{color:var(--muted);line-height:1.5;font-size:13px;margin:7px 0 14px}
.formula{background:#101926;border:1px solid #29384b;padding:10px;border-radius:10px;margin-bottom:13px}
.section-label{display:flex;justify-content:space-between;gap:10px;color:var(--sub);font-size:10px;font-weight:820;letter-spacing:.12em}
.section-label span{letter-spacing:0;text-transform:none;font-size:11px;font-weight:600}
.moves{display:flex;gap:5px;flex-wrap:wrap;margin-top:8px;min-height:29px}
.move-token,.move-pad button{min-height:30px;min-width:32px;padding:3px 6px;border:1px solid #34465b;border-radius:6px;background:#202d3e;font-family:"Cascadia Mono",Consolas,monospace;font-weight:740;color:#e0e9f4}
.move-token:hover,.move-pad button:hover{border-color:var(--gold);color:var(--gold)}
.move-token.done{color:#9eafc1;background:#141d29}
.move-token.active{color:#231b0d;background:var(--gold);border-color:var(--gold)}
.insight{margin-bottom:12px}
.insight h3{display:flex;align-items:center;gap:7px;font-size:14px;margin:0 0 8px}
.insight h3 [data-icon]{color:var(--gold)}
.groups{display:grid;gap:6px}
.group{width:100%;display:grid;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:8px;background:#192536;border:1px solid #29384c;border-radius:8px;padding:7px;text-align:left}
.group:hover,.group.active{background:#203045;border-color:#495b71}
.group i{font-style:normal;background:#293a4f;color:#c8d7e8;font-size:10px;font-weight:750;border-radius:5px;display:grid;place-items:center;height:22px}
.group.active i{background:#59482c;color:var(--gold)}
.group b{font-size:12px;display:block}
.group small{font-size:11px;line-height:1.4;color:var(--muted);display:block;margin-top:2px}
.group code{font-family:monospace;color:var(--gold);font-size:11px;white-space:nowrap}
.checkpoint{margin-top:8px;color:var(--mint);font-size:11px;line-height:1.4;min-height:15px}
.full{width:100%;margin-top:auto;justify-content:flex-start}
.full span:last-child{margin-left:auto}
.drill-head{min-height:34px;color:var(--muted);font-size:12px}
.drill-options{width:max-content;margin-bottom:8px}
#drill-feedback{flex:1;line-height:1.45}
.move-pad{display:flex;flex-wrap:wrap;gap:5px;margin-top:8px}
.library-section{padding:33px 0 32px;scroll-margin-top:12px}
.library-head{display:flex;justify-content:space-between;align-items:end;gap:14px;margin-bottom:15px}
.library-head h2{font-size:27px;letter-spacing:-.04em;margin-bottom:4px}
.filters{display:flex;gap:8px}
.search{display:flex;gap:8px;align-items:center;border:1px solid #304055;border-radius:9px;background:#141f2e;padding:0 10px;color:var(--sub);min-height:40px}
.search input{min-width:0;width:169px;background:none;border:none;color:var(--text);outline:none;padding:0;font-size:12px}
.search:focus-within{border-color:var(--gold)}
.search input:focus-visible{outline:none}
.library-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.library-card{display:flex;align-items:center;gap:13px;min-height:78px;background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:10px 12px;text-align:left;min-width:0}
.library-card:hover,.library-card[aria-current=true]{background:#1b293a;border-color:var(--phase,var(--gold))}
.library-card .case-info{min-width:0}
.library-card small{display:block;color:var(--phase,var(--gold));font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}
.library-card strong{display:block;font-size:13px;line-height:1.35}
.library-card .card-arrow{margin-left:auto;color:var(--sub);flex:none}
.diagram{display:grid;gap:2px;flex:none;grid-template-columns:repeat(5,7px);grid-template-rows:repeat(5,7px);align-content:center;justify-content:center;width:53px;height:53px;background:#101926;border:1px solid #2b3b4e;border-radius:8px}
.diagram i{border-radius:1px}
.more{display:flex;margin:15px auto 0}
.empty{grid-column:1/-1;background:var(--panel);border:1px dashed var(--line);border-radius:10px;padding:19px;color:var(--muted)}
.footer{border-top:1px solid var(--line);padding:15px 0 24px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px}
.footer .brand{font-size:15px;color:var(--text)}
.footer .brand-icon{width:24px;height:24px;border-radius:6px}
.footer a:not(.brand){text-decoration:underline;text-underline-offset:3px}
.dialog{color:var(--text);background:var(--panel);border:1px solid #39495d;border-radius:17px;width:min(100% - 24px,550px);max-height:calc(100dvh - 24px);padding:22px;box-shadow:0 20px 80px #0009}
.dialog::backdrop{background:#070c13c7;backdrop-filter:blur(4px)}
.dialog-header{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:12px}
.dialog-header h2{font-size:26px;letter-spacing:-.04em;margin-top:6px}
.dialog p{color:var(--muted);line-height:1.6;font-size:13px;margin-bottom:12px}
.notation-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}
.notation-cards>div{border:1px solid var(--line);border-radius:8px;padding:8px}
.notation-cards b{display:block;color:var(--gold);font-size:19px}
.notation-cards span,.notation-list dd{color:var(--muted);font-size:12px}
.notation-list{display:grid;grid-template-columns:75px 1fr;gap:8px}
.notation-list dt{font-family:monospace;color:var(--gold)}
.notation-list dd{margin:0}
.shortcuts kbd{font:inherit;color:var(--text);border:1px solid #415169;border-radius:4px;padding:2px 5px;margin-left:4px}
.progress-list{display:grid;gap:12px}
.progress-entry{display:grid;grid-template-columns:1fr auto;gap:5px;font-weight:680}
.progress-entry span{font-size:12px;color:var(--muted)}
.progress-entry progress{grid-column:1/-1;width:100%;accent-color:var(--phase);height:10px}
.scan-dialog{width:min(100% - 24px,670px)}
.scan-steps{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;margin-bottom:12px}
.scan-step{border:1px solid var(--line);border-radius:7px;background:#101927;padding:7px 3px;color:var(--muted);font-size:11px;min-height:39px}
.scan-step span{display:inline-block;border-radius:3px;width:8px;height:8px;margin-right:4px}
.scan-step.active{border-color:var(--gold);color:var(--gold)}
.scan-step.captured{border-color:#508a79;color:var(--mint)}
.scan-body{display:grid;grid-template-columns:1.2fr 1fr;gap:14px}
.scan-video{position:relative;min-height:240px;width:100%;align-self:start;aspect-ratio:1;background:#0a1018;border:1px solid #314055;border-radius:10px;overflow:hidden;display:grid;place-items:center}
.scan-orientation{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px;color:var(--muted);margin-bottom:10px}
.scan-orientation select{border:1px solid var(--line);background:#172231;color:var(--text);border-radius:7px;padding:5px;max-width:45%}
.scan-video video{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.scan-reticle{position:absolute;width:72%;height:72%;left:14%;top:14%;display:grid;grid-template-columns:repeat(3,1fr);gap:2px;pointer-events:none}
.scan-reticle i{border:1px solid #ffcf70d0;border-radius:3px;display:grid;place-items:center}
.scan-reticle i::after{content:"";width:5px;height:5px;border-radius:50%;background:#ffcf70}
.scan-video-placeholder{color:var(--sub);display:grid;place-items:center;gap:8px;text-align:center;padding:10px;font-size:12px}
.scan-video-placeholder svg{width:27px;height:27px}
.scan-instructions h3{margin:0 0 6px;font-size:17px}
.scan-instructions p{margin-bottom:8px}
.scan-actions{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}
.scan-preview{display:grid;grid-template-columns:repeat(3,34px);gap:4px;margin:6px 0}
.scan-preview button,.palette button{width:34px;height:34px;border:2px solid #8390a277;border-radius:6px;background:var(--swatch);color:#121926;font-size:11px;font-weight:800}
.scan-preview button[aria-pressed=true]{outline:2px solid var(--gold);outline-offset:1px}
.palette{display:flex;flex-wrap:wrap;gap:4px}
.palette button{width:24px;height:24px}
.scan-status{color:var(--gold)!important;margin-top:10px;min-height:20px}
.result-box{background:#101a27;border:1px solid var(--line);padding:14px;border-radius:10px}
.result-box h3{font-size:22px;margin-bottom:5px}
.result-box p:last-child{margin-bottom:0}
.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden;white-space:nowrap}
@media(max-width:1000px){.wrap{width:calc(100% - 50px)}.phase-count{display:none}.studio{grid-template-columns:1.2fr 1fr}}
@media(max-width:760px){.wrap{width:calc(100% - 30px)}.site-header{height:59px}.main-nav{gap:12px}.main-nav a:nth-child(2){display:none}.brand{font-size:18px}.brand-icon{width:30px;height:30px}.header-row{gap:10px}.intro{padding:24px 0 21px;align-items:start}.intro p{font-size:13px}.intro .btn{margin-top:13px;min-height:34px;font-size:11px}.phase-nav{gap:6px;margin-bottom:13px}.phase-card{gap:5px;padding:7px 3px;min-height:57px;flex-direction:column;text-align:center}.phase-icon{height:25px;width:25px;border-radius:6px}.phase-icon svg{width:15px;height:15px}.phase-card strong{font-size:12px;margin:0}.phase-card small{display:none}.studio{grid-template-columns:1fr;gap:12px}.viewer{min-height:0}.viewport{min-height:325px}.lesson{padding:13px 14px 14px}.library-section{padding-top:23px}.library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.library-card{gap:7px;padding:7px}.library-card .card-arrow{display:none}.view-tools{top:9px;right:9px}}
@media(max-width:440px){.wrap{width:calc(100% - 22px)}.main-nav a:first-child{display:none}.intro{display:block}.intro h1{font-size:39px}.intro .btn{margin-top:12px}.hide-mobile{display:none!important}.header-row .scan-open{min-height:36px;padding:0 8px;font-size:12px}.viewport{min-height:288px}.viewer-head{padding:9px 9px 9px 12px;min-height:52px}.player,.drill{padding:9px 10px}.library-head{display:block}.filters{margin-top:10px}.search{flex:1}.search input{width:100%}.scan-body{grid-template-columns:1fr}.scan-video{min-height:0;max-height:250px;aspect-ratio:1;justify-self:center;width:100%;max-width:250px}.scan-dialog{padding:13px}.scan-step{font-size:10px}.scan-step span{display:none}.footer{font-size:10px}.footer .brand{font-size:13px}}
@media(max-width:375px){.player-row{gap:4px}.player-row .icon-btn{width:32px}.player-row .play{width:39px}.speed-label select{padding-inline:3px}.view-tools .track-btn span:last-child{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}