:root {
  --ink:#102d40; --field:#153c50; --field-2:#246175; --chalk:#f1faf8; --paper:#61c2bd;
  --gold:#ef9653; --orange:#d96b34; --mint:#61c2bd; --muted:#526673; --line:#c4d7d9;
  --white:#fffefa; --shadow:0 18px 50px rgba(7,26,20,.11); --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.45}
button,input,select{font:inherit}
button{cursor:pointer}
.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:12px clamp(18px,4vw,56px);background:rgba(16,45,64,.98);color:var(--chalk);border-bottom:1px solid rgba(255,255,255,.12);backdrop-filter:blur(16px)}
.brand{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none;letter-spacing:.08em}.brand-mark{width:38px;height:38px;color:var(--gold)}.brand span{display:grid;line-height:1.05}.brand b{font-size:.78rem}.brand small{font-size:.64rem;color:var(--mint);margin-top:4px}
.top-actions{display:flex;gap:10px;align-items:center}.privacy-pill{font-size:.76rem;display:flex;align-items:center;gap:7px;color:#d7e4dc}.privacy-pill i{width:7px;height:7px;background:var(--mint);border-radius:50%;box-shadow:0 0 0 4px rgba(143,224,190,.13)}
main{max-width:1480px;margin:auto;padding:0 clamp(16px,3vw,42px) 70px}.intro{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,.5fr);gap:48px;align-items:end;padding:64px 2px 34px}.eyebrow{margin:0 0 7px;font-size:.7rem;font-weight:800;letter-spacing:.15em;color:#4f685d}.intro h1{font-family:Georgia,serif;font-size:clamp(2.35rem,5vw,5.7rem);font-weight:500;letter-spacing:-.055em;line-height:.93;margin:0;max-width:890px}.lede{font-size:clamp(1rem,1.45vw,1.25rem);color:#41534b;max-width:760px;margin:24px 0 0}.intro-note{border-left:3px solid var(--gold);padding:5px 0 5px 18px;display:grid;gap:6px}.intro-note strong{font-family:Georgia,serif;font-size:1.15rem}.intro-note span{font-size:.91rem}.intro-note small{color:var(--muted)}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 0 rgba(7,26,20,.05)}.source-card{padding:24px;margin-bottom:20px}.section-heading{display:flex;align-items:center;gap:14px}.section-heading h2,.film-head h2,.receipt-head h2,.method-card h2{font-family:Georgia,serif;font-weight:500;line-height:1.05;margin:0;font-size:1.55rem}.section-heading p,.film-head p,.receipt-head p{margin-bottom:3px}.step-number{display:grid;place-items:center;flex:0 0 38px;height:38px;border:1px solid var(--ink);border-radius:50%;font-size:.74rem;font-weight:800}.section-heading.compact{margin-bottom:18px}.section-heading.compact .step-number{width:32px;height:32px;flex-basis:32px}.section-heading.compact h2{font-size:1.3rem}
.source-tabs{display:flex;gap:4px;margin:22px 0 14px;border-bottom:1px solid var(--line)}.source-tab{border:0;background:transparent;padding:10px 16px;color:var(--muted);font-weight:750;border-bottom:3px solid transparent}.source-tab.active{color:var(--ink);border-bottom-color:var(--gold)}.source-pane{display:none}.source-pane.active{display:block}.dropzone{min-height:112px;border:1.5px dashed #9eaaa3;border-radius:14px;display:flex;align-items:center;justify-content:center;gap:16px;padding:24px;background:#fbfaf5;transition:.2s}.dropzone:hover{border-color:var(--field);background:#f6f7f1}.dropzone input{position:absolute;opacity:0;pointer-events:none}.upload-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--ink);color:var(--white);font-size:1.5rem}.dropzone>span:last-child{display:grid}.dropzone small{color:var(--muted);margin-top:4px}.youtube-form{display:grid;gap:7px}.youtube-form label,.select-grid label,.calibration-controls label,.tracking-toolbar label,.manual-entry label,.mark-grid label{font-size:.72rem;font-weight:800;letter-spacing:.05em;color:#455950;text-transform:uppercase}.youtube-form>div{display:flex;gap:8px}.youtube-form input{flex:1}.youtube-form small{color:var(--muted)}
input,select{width:100%;border:1px solid #aeb9b2;border-radius:9px;background:white;color:var(--ink);padding:10px 11px;outline:none}input:focus,select:focus{border-color:var(--field);box-shadow:0 0 0 3px rgba(17,73,54,.12)}.button,.mini-button{border:0;border-radius:9px;padding:10px 15px;font-weight:800}.button.primary{background:var(--field);color:white}.button.primary:hover{background:#102d40}.button.ghost{background:transparent;color:inherit;border:1px solid currentColor}.topbar .button{padding:8px 12px;font-size:.76rem}.button:disabled{opacity:.45;cursor:not-allowed}.mini-button{background:#e7ece7;color:var(--ink);padding:6px 9px;font-size:.72rem}.wide{width:100%}
.workspace{display:grid;grid-template-columns:minmax(0,1.42fr) minmax(350px,.72fr);gap:20px;align-items:start}.film-column{display:grid;gap:20px}.receipt-column{display:grid;gap:20px;position:sticky;top:82px}.film-card{overflow:hidden}.film-head,.receipt-head{display:flex;justify-content:space-between;align-items:center;padding:20px 22px}.timecode{font-variant-numeric:tabular-nums;font-family:ui-monospace,monospace;font-weight:700;background:#e6ece7;border-radius:8px;padding:7px 9px}.stage{position:relative;aspect-ratio:16/9;background:var(--ink);overflow:hidden}.stage video,.stage iframe,.stage canvas{position:absolute;inset:0;width:100%;height:100%;border:0}.stage video,.stage iframe{display:none;object-fit:contain;background:#050c09}.stage canvas{display:none;z-index:5;touch-action:none}.stage.tracking canvas,.stage.calibrating canvas{display:block;cursor:crosshair}.stage-placeholder{position:absolute;inset:0;display:grid;place-content:center;text-align:center;color:#b9cec2}.stage-placeholder svg{width:min(420px,70vw);fill:none;stroke:#406758;stroke-width:.7}.stage-placeholder p{margin:13px 0 0;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase}.canvas-instruction{display:none;position:absolute;z-index:7;top:12px;left:12px;right:12px;padding:9px 12px;background:rgba(7,26,20,.88);color:white;border:1px solid rgba(255,255,255,.25);border-radius:9px;font-size:.78rem}.stage.calibrating .canvas-instruction,.stage.tracking .canvas-instruction{display:block}.film-tools{display:flex;gap:8px;align-items:center;padding:13px 20px;background:#edf0e9}.film-tools .button{padding:7px 10px;font-size:.74rem}.tool-hint{font-size:.72rem;color:var(--muted);margin-left:auto}
.timeline-card,.observation-card,.calibration-card,.tracking-card{padding:22px}.mark-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.mark-grid label{display:grid;grid-template-columns:1fr auto;gap:6px;align-items:end}.mark-grid input{grid-column:1/-1}.validation-line{font-size:.8rem;color:var(--muted);margin:14px 0 0;display:flex;align-items:center;gap:7px}.validation-line span{width:8px;height:8px;border-radius:50%;background:#a1aaa5}.validation-line.valid{color:#176b4f}.validation-line.valid span{background:#2ead7e}.validation-line.invalid{color:#a44a27}.validation-line.invalid span{background:var(--orange)}
.select-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.select-grid label{display:grid;gap:5px}.plain-note,.instruction{color:var(--muted);font-size:.8rem}.plain-note{display:block;margin-top:14px}.instruction{margin:0 0 15px}.calibration-controls{display:grid;grid-template-columns:110px 120px 1fr auto;gap:8px;align-items:end}.calibration-controls label,.tracking-toolbar label,.manual-entry label{display:grid;gap:5px}.calibration-controls label span,.manual-entry label span{font-weight:500;text-transform:none}.corner-list{display:grid;grid-template-columns:repeat(4,1fr);list-style-position:inside;margin:15px 0 0;padding:0;gap:5px}.corner-list li{padding:8px;background:#edf0e9;color:#708078;border-radius:7px;font-size:.74rem}.corner-list li.done{background:#d9eee3;color:#165c45;font-weight:800}
.tracking-toolbar{display:grid;grid-template-columns:180px 1fr auto;gap:8px;align-items:end}.manual-entry{display:grid;grid-template-columns:1.4fr repeat(3,.7fr) auto;gap:8px;align-items:end;background:#f1f1e9;border-radius:12px;padding:13px;margin-top:16px}.manual-entry p{margin-bottom:2px}.manual-entry small{color:var(--muted)}.track-tables{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}.track-tables h3{display:flex;justify-content:space-between;margin:0 0 7px;font-size:.82rem}.track-tables h3 span{display:grid;place-items:center;width:22px;height:22px;background:var(--ink);color:white;border-radius:50%;font-size:.68rem}.point-list{min-height:44px;border:1px solid var(--line);border-radius:9px;overflow:hidden}.point-list.empty{display:grid;place-items:center;color:#89958f;font-size:.75rem}.point-row{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:5px;padding:7px 8px;border-bottom:1px solid #e4e8e3;font-size:.71rem;font-variant-numeric:tabular-nums}.point-row:last-child{border:0}.point-row button{border:0;background:transparent;color:#a34f32}
.receipt-card{overflow:hidden}.receipt-head{background:var(--ink);color:white}.receipt-head .eyebrow{color:var(--mint)}.evidence-badge{font-size:.64rem;text-transform:uppercase;letter-spacing:.07em;font-weight:900;padding:7px 9px;border-radius:99px;background:#3a4c44;color:#d6ded9}.evidence-badge.mid{background:#725d22;color:#fff1bd}.evidence-badge.high{background:#176b4f;color:#e8fff6}.metric-grid{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line)}.metric-grid>div{padding:16px;border-right:1px solid var(--line);border-top:1px solid var(--line);display:grid}.metric-grid>div:nth-child(2n){border-right:0}.metric-grid span{font-size:.67rem;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.07em}.metric-grid strong{font-family:Georgia,serif;font-size:1.55rem;font-weight:500;margin:4px 0}.metric-grid small{font-size:.67rem;color:#839087}.player-readouts{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line)}.player-readouts section{padding:17px}.player-readouts section:first-child{border-right:1px solid var(--line)}.player-readouts h3{margin:0 0 10px;font-size:.82rem}.player-readouts i{display:inline-block;width:9px;height:9px;margin-right:5px}.offense-dot{border:2px solid var(--orange);border-radius:50%}.defense-dot{background:var(--mint);clip-path:polygon(50% 0,100% 100%,0 100%)}dl{margin:0}dl div{display:flex;justify-content:space-between;gap:12px;padding:5px 0;font-size:.74rem}dt{color:var(--muted)}dd{margin:0;font-weight:800;font-variant-numeric:tabular-nums}.explanation{padding:20px;border-bottom:1px solid var(--line);background:#fbf7e9}.explanation h3{font-family:Georgia,serif;font-size:1.18rem;font-weight:500;margin:0 0 8px}.explanation p:last-child{font-size:.84rem;margin:0;color:#4f5f57}.formula-stack{padding:9px 20px}.formula-stack details{border-bottom:1px solid #dde2dd;padding:10px 0}.formula-stack details:last-child{border:0}.formula-stack summary{font-size:.78rem;font-weight:800;display:flex;justify-content:space-between;gap:8px}.formula-stack code{color:#1d7055;font-weight:600}.formula-stack p{font-size:.76rem;color:var(--muted);margin:8px 0 2px}.syntax-box{margin:0 20px 16px;padding:13px;background:#e9ede8;border-radius:10px;overflow:auto}.syntax-box code{display:block;font-size:.68rem;white-space:normal;overflow-wrap:anywhere;color:#174b39}.receipt-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:0 20px 20px}.method-card{padding:20px}.method-card h2{margin-bottom:14px}.method-card ul{padding-left:18px;margin:0;color:#53665d;font-size:.82rem}.method-card li+li{margin-top:8px}
.core-strip{display:grid;grid-template-columns:.8fr 1.2fr;gap:30px;margin-top:22px;padding:30px;background:var(--field);color:white;border-radius:var(--radius)}.core-strip .eyebrow{color:var(--mint)}.core-strip h2{font-family:Georgia,serif;font-size:1.8rem;font-weight:500;margin:0}.core-strip ol{display:grid;grid-template-columns:repeat(5,1fr);list-style:none;margin:0;padding:0}.core-strip li{position:relative;display:grid;justify-items:center;gap:4px}.core-strip li:not(:last-child):after{content:"";position:absolute;left:65%;right:-35%;top:17px;height:1px;background:#769284}.core-strip b{display:grid;place-items:center;width:35px;height:35px;border:1px solid var(--gold);border-radius:50%;font-size:.76rem;z-index:1;background:var(--field)}.core-strip span{font-size:.7rem;color:#c9d8d1}
footer{display:grid;grid-template-columns:250px 1fr;gap:30px;padding:28px clamp(18px,4vw,56px);background:var(--ink);color:#c4d1ca;font-size:.74rem}footer div{display:grid}footer b{color:white;letter-spacing:.08em}footer span{color:var(--mint)}footer p{margin:0;max-width:900px}.toast{position:fixed;right:20px;bottom:20px;max-width:360px;padding:12px 15px;background:var(--ink);color:white;border-radius:10px;box-shadow:var(--shadow);font-size:.8rem;transform:translateY(100px);opacity:0;transition:.25s;z-index:40}.toast.show{transform:translateY(0);opacity:1}
@media(max-width:1050px){.workspace{grid-template-columns:1fr}.receipt-column{position:static}.select-grid{grid-template-columns:1fr 1fr}.intro{grid-template-columns:1fr}.manual-entry{grid-template-columns:1fr 1fr}.manual-entry>div{grid-column:1/-1}.core-strip{grid-template-columns:1fr}}
@media(max-width:700px){.topbar{padding:10px 14px}.privacy-pill{display:none}.brand b{font-size:.7rem}.brand-mark{width:32px}.intro{padding-top:40px;gap:24px}.intro h1{font-size:2.65rem}.source-card,.timeline-card,.observation-card,.calibration-card,.tracking-card{padding:17px}.workspace{gap:14px}.mark-grid,.select-grid,.track-tables{grid-template-columns:1fr}.calibration-controls,.tracking-toolbar{grid-template-columns:1fr 1fr}.calibration-controls label{grid-row:auto}.corner-list{grid-template-columns:1fr 1fr}.tool-hint{display:none}.manual-entry{grid-template-columns:1fr 1fr}.manual-entry .mini-button{height:42px}.receipt-actions{grid-template-columns:1fr}.core-strip ol{gap:2px}.core-strip li:not(:last-child):after{left:72%;right:-28%}.core-strip span{font-size:.57rem}footer{grid-template-columns:1fr}.youtube-form>div{display:grid}.film-head{padding:16px}.metric-grid strong{font-size:1.25rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.lab-nav{display:flex;flex-wrap:wrap;gap:10px 20px}.lab-nav a{color:#e6f7f5;font-weight:700;font-size:.85rem;text-decoration-thickness:1px;text-underline-offset:5px}.brand-mark{width:52px;height:52px}.topbar{gap:18px}.camera-controls{display:flex;align-items:center;gap:16px;margin:18px 0}.camera-controls label{display:flex;align-items:flex-start;gap:9px;font-size:.85rem}.camera-controls input{width:20px;height:20px;flex:none}.camera-controls button{flex:none}.evidence-notes{padding:12px 20px;margin:0;color:#183f53;background:#e9f6f3;font-size:.83rem;overflow-wrap:anywhere}.evidence-badge{background:#61c2bd;color:#102d40;max-width:145px;text-align:center}footer a{color:#b8efeb;font-size:.7rem;margin-top:8px}button:focus-visible,a:focus-visible,.dropzone:focus-within{outline:3px solid #e97838;outline-offset:4px}.receipt-head{gap:10px}.receipt-actions{grid-template-columns:1fr}.film-head h2{overflow-wrap:anywhere}.top-actions .privacy-pill{display:none}@media(max-width:850px){.topbar{flex-wrap:wrap;position:static}.lab-nav{order:3;width:100%;justify-content:space-between}.camera-controls{display:grid}.top-actions{margin-left:auto}.intro h1{font-size:clamp(2.4rem,10vw,4rem)}}
.canvas-instruction{pointer-events:none}.stage{scroll-margin-top:90px}