:root{color-scheme:dark;--bg:#0c100e;--panel:#121815;--panel2:#171f1a;--border:#29332c;--text:#edf2eb;--muted:#8d9b90;--green:#c4f36a;--green2:#8dbb3f;--red:#ff8f7b;--square-light:#c8bcb5;--square-dark:#3d3f44;--shadow:0 20px 70px #0005}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Manrope,system-ui,sans-serif;min-height:100vh;overflow-x:hidden}body.light{color-scheme:light;--bg:#f1f3ec;--panel:#fff;--panel2:#f5f7ef;--border:#d9dfd4;--text:#182019;--muted:#657267;--green:#416b0b;--green2:#608d20;--shadow:0 20px 70px #17221812}.ambient{position:absolute;pointer-events:none;filter:blur(95px);opacity:.12;border-radius:50%;z-index:-1}.ambient-a{width:420px;height:420px;background:#8bd148;top:70px;left:-260px}.ambient-b{width:380px;height:380px;background:#3e7659;top:570px;right:-240px}.topbar{height:78px;max-width:1240px;margin:auto;padding:0 30px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-size:12px;letter-spacing:2px;font-weight:800}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border:1px solid var(--green2);border-radius:10px;color:var(--green);font-size:24px}.brand-light{font-weight:500;color:var(--muted)}nav{display:flex;gap:30px}nav a{color:var(--muted);text-decoration:none;font-size:12px}nav a:hover,nav .nav-active{color:var(--text)}button,input{font:inherit}.icon-button{width:38px;height:38px;border:1px solid var(--border);border-radius:50%;background:var(--panel);color:var(--text);font-size:20px;cursor:pointer}main{max-width:1180px;margin:auto;padding:0 28px}.hero{padding:86px 0 76px;max-width:760px}.eyebrow{font-family:"DM Mono",monospace;font-size:10px;letter-spacing:2px;color:var(--green);display:flex;align-items:center;gap:9px}.live-dot{width:6px;height:6px;background:var(--green);display:inline-block;border-radius:50%;box-shadow:0 0 12px #b6ec54aa}.hero h1{font-size:clamp(46px,7vw,78px);line-height:1.02;letter-spacing:-4px;margin:24px 0 18px;font-weight:600}.hero h1 em,.how-section h2 em{font-family:Georgia,serif;font-weight:400;color:var(--green);letter-spacing:-2px}.hero-copy{font-size:15px;line-height:1.8;color:var(--muted);max-width:510px}.hero-stats{display:flex;align-items:center;gap:20px;margin-top:34px}.hero-stats div{display:grid;gap:6px}.hero-stats strong{font-family:"DM Mono",monospace;font-size:12px;color:var(--green)}.hero-stats span{font-size:10px;color:var(--muted)}.hero-stats i{height:1px;width:40px;background:var(--border)}.workspace{border-top:1px solid var(--border);padding-top:32px}.section-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.section-heading h2{font-size:25px;letter-spacing:-1px;margin:9px 0 0}.status-pill,.engine-tag{font:10px "DM Mono",monospace;letter-spacing:1px;border:1px solid var(--border);padding:8px 10px;border-radius:30px;color:var(--muted);display:flex;gap:8px;align-items:center}.analyzer-grid{display:grid;grid-template-columns:minmax(300px,1fr) minmax(300px,.86fr);gap:16px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);min-width:0}.board-panel{padding:18px}.panel-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:17px}.panel-label{font:10px "DM Mono",monospace;letter-spacing:1.5px;color:var(--muted)}.board-actions{display:flex;gap:8px}.quiet-button{border:1px solid var(--border);background:transparent;color:var(--muted);border-radius:7px;padding:7px 10px;font-size:11px;cursor:pointer}.board-surround{display:grid;grid-template-columns:18px minmax(0,1fr);grid-template-rows:auto auto;column-gap:5px;row-gap:0;align-items:stretch;width:100%;max-width:100%}.rank-labels{grid-column:1;grid-row:1;display:grid;grid-template-rows:repeat(8,minmax(0,1fr));align-items:center;text-align:center;padding:3px 0;color:#a9bdd6;font-size:11px;font-weight:700;line-height:1}.file-labels{grid-column:2;grid-row:2;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));align-items:center;text-align:center;padding:8px 3px 0;color:#a9bdd6;font-size:12px;font-weight:700;line-height:1}.chessboard{grid-column:2;grid-row:1;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));aspect-ratio:1;border:3px solid #1a1c20;border-radius:3px;overflow:hidden;user-select:none;background:#202226;box-shadow:0 0 0 1px #73757a50,0 12px 30px #0008,inset 0 0 0 1px #ffffff16}.square{aspect-ratio:1;min-width:0;min-height:0;display:grid;place-items:center;position:relative;overflow:hidden;cursor:pointer;padding:0;border:0;border-radius:0;line-height:1}.square.light{background-color:#c6bab3;background-image:repeating-linear-gradient(0deg,#ffffff06 0 1px,transparent 1px 4px),repeating-linear-gradient(90deg,#00000004 0 1px,transparent 1px 5px),linear-gradient(145deg,#d1c6bf 0%,#b8aca5 100%)}.square.dark{background-color:#3a3c41;background-image:repeating-linear-gradient(135deg,#ffffff07 0 1px,transparent 1px 5px),repeating-linear-gradient(0deg,#00000008 0 1px,transparent 1px 4px),linear-gradient(145deg,#45474d 0%,#303237 100%)}.square.selected{z-index:2;box-shadow:inset 0 0 0 3px #a2ffc1,inset 0 0 18px #57efa33d,0 0 12px #6effae35}.square.last-move:after{content:"";position:absolute;inset:0;background:linear-gradient(140deg,#8cfcad46,#47d98520);box-shadow:inset 0 0 0 1px #83f4a75c;pointer-events:none;z-index:1}.square.legal:before{content:"";position:absolute;z-index:1;width:24%;height:24%;border-radius:50%;background:#172c2290;box-shadow:0 1px 3px #0004}.square.capture:before{content:"";position:absolute;z-index:1;inset:4px;border:3px solid #9cf8b6b8;border-radius:50%;box-shadow:inset 0 0 12px #0003}.piece-image{position:relative;z-index:3;display:block;width:91%;height:91%;object-fit:contain;pointer-events:none;user-select:none;filter:drop-shadow(0 2px 1px #000b) drop-shadow(0 5px 2px #0005);transform:translateY(-1px)}.square:focus-visible{outline:3px solid #9bffc0;outline-offset:-3px;z-index:4}.board-footer{display:flex;justify-content:space-between;gap:12px;margin:13px 0 18px;font-size:11px;color:var(--muted)}.board-footer span:last-child,.mono{font:9px "DM Mono",monospace;letter-spacing:1px}.position-input{border-top:1px solid var(--border);padding-top:16px;display:grid;gap:9px}.position-input>label{font:10px "DM Mono",monospace;letter-spacing:1.5px;color:var(--muted)}.input-row{display:flex;gap:8px;align-items:center;min-width:0}.input-row input:not([type=file]){min-width:0;width:100%;border:1px solid var(--border);border-radius:7px;background:var(--panel2);padding:11px 10px;color:var(--text);font-size:11px;outline:none}.input-row input:focus{border-color:var(--green2)}.small-button{flex-shrink:0;border:1px solid var(--green2);border-radius:7px;padding:10px 12px;background:#a6d95714;color:var(--green);font-size:11px;cursor:pointer}.upload-button{font-size:11px;color:var(--green);cursor:pointer;border:1px dashed var(--border);padding:9px 11px;border-radius:7px;white-space:nowrap}.subtle{font-size:10px;color:var(--muted);line-height:1.5}.image-preview{width:100%;max-height:180px;object-fit:contain;border-radius:8px;border:1px solid var(--border)}.results-panel{padding:18px;display:flex;flex-direction:column;min-height:100%}.engine-tag{font-size:8px;padding:7px;color:var(--green);white-space:nowrap}.empty-analysis{flex:1;min-height:420px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px}.radar{width:90px;height:90px;border:1px solid var(--border);border-radius:50%;display:grid;place-items:center;position:relative;color:var(--green);font-size:40px;margin-bottom:24px;background:radial-gradient(circle,var(--panel2),transparent)}.radar i{position:absolute;border:1px solid var(--border);border-radius:50%;inset:10px}.radar i:nth-child(2){inset:-10px}.radar i:nth-child(3){inset:22px}.empty-analysis h3{font-size:16px;margin:0 0 9px}.empty-analysis p{font-size:12px;line-height:1.7;color:var(--muted);max-width:260px;margin:0 0 22px}.primary-button{background:var(--green);color:#16200e;border:0;border-radius:8px;padding:13px 17px;font-size:12px;font-weight:800;cursor:pointer;transition:transform .15s,opacity .15s}.primary-button:hover{transform:translateY(-1px);opacity:.92}.primary-button:disabled{opacity:.55;cursor:wait}.microcopy{font-size:9px;color:var(--muted);margin-top:13px}.engine-footer{margin-top:auto;padding-top:15px;border-top:1px solid var(--border);display:flex;align-items:center;gap:8px;font-size:10px;color:var(--muted)}.engine-dot{width:6px;height:6px;border-radius:50%;background:var(--green2)}.engine-footer .mono{margin-left:auto;font-size:9px}.eval-block{background:var(--panel2);border:1px solid var(--border);border-radius:10px;padding:15px;display:grid;gap:7px}.eval-block strong{font-size:32px;letter-spacing:-1px}.eval-block>span:last-child{font-size:11px;color:var(--muted)}.best-move-block{padding:20px 0;border-bottom:1px solid var(--border)}.result-kicker{font:10px "DM Mono",monospace;letter-spacing:1.5px;color:var(--green)}.best-move-line{display:flex;align-items:baseline;gap:12px;margin-top:9px}.best-move-line strong{font-size:31px;letter-spacing:-1px}.best-move-line span{font:12px "DM Mono",monospace;color:var(--muted)}.best-move-block p,.brilliant-block p{font-size:11px;line-height:1.7;color:var(--muted);margin-bottom:0}.candidate-block{padding:18px 0}.row-heading{display:flex;justify-content:space-between;gap:8px;margin-bottom:11px}.candidate-row{display:grid;grid-template-columns:28px 1fr auto;gap:9px;align-items:center;padding:11px 0;border-top:1px solid var(--border);font-size:11px}.candidate-rank{font:10px "DM Mono",monospace;color:var(--muted)}.candidate-line{color:var(--text);overflow-wrap:anywhere}.candidate-eval{font:11px "DM Mono",monospace;color:var(--green)}.brilliant-block{display:flex;gap:13px;padding:15px;border:1px solid #9fc65a55;background:#a8d75a0a;border-radius:10px;margin-bottom:15px}.brilliant-icon{width:30px;height:30px;flex-shrink:0;border-radius:8px;background:#a8d75a1a;display:grid;place-items:center;color:var(--green);font-size:19px}.brilliant-block h3{font-size:13px;margin:7px 0 0}.full-button{width:100%}.how-section{padding:95px 0 85px}.how-section h2{font-size:clamp(34px,5vw,52px);line-height:1.12;letter-spacing:-2px;margin:19px 0 38px}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.principles article{border-top:1px solid var(--border);padding-top:17px}.principles article span{font:10px "DM Mono",monospace;color:var(--green)}.principles h3{font-size:15px;margin:17px 0 8px}.principles p{font-size:12px;line-height:1.8;color:var(--muted);margin:0}footer{border-top:1px solid var(--border);min-height:80px;display:flex;align-items:center;justify-content:space-between;gap:15px;color:var(--muted);font-size:10px}.footer-brand{font-size:10px}.footer-brand .brand-mark{width:28px;height:28px;font-size:20px}.notice{padding:10px 12px;background:#f0b65a14;border:1px solid #f0b65a44;color:#d9b578;border-radius:8px;font-size:11px;line-height:1.6;margin:10px 0}.error-notice{background:#ff8f7b12;border-color:#ff8f7b55;color:var(--red)}[hidden]{display:none!important}@media(max-width:820px){main{padding:0 18px}.topbar{padding:0 18px}.analyzer-grid{grid-template-columns:1fr}.hero{padding:65px 0 58px}.hero h1{letter-spacing:-2.5px}.empty-analysis{min-height:330px}.principles{gap:15px}.principles p{font-size:11px}}@media(max-width:540px){nav{gap:13px}nav a{font-size:10px}.topbar{height:66px}.brand{font-size:10px;letter-spacing:1px}.hero-stats{gap:11px}.hero-stats i{width:18px}.hero-stats span{font-size:9px}.section-heading h2{font-size:22px}.board-panel,.results-panel{padding:12px}.piece-image{width:92%;height:92%}.rank-labels{font-size:10px}.file-labels{font-size:11px}.principles{grid-template-columns:1fr;gap:24px}.how-section{padding:65px 0}.how-section h2{font-size:37px}footer{flex-wrap:wrap;padding:20px 0}footer .mono{display:none}.engine-tag{font-size:7px}.upload-button{font-size:10px}.subtle{font-size:9px}}
.turn-select{flex-shrink:0;max-width:132px;border:1px solid var(--border);border-radius:7px;padding:9px 8px;background:var(--panel2);color:var(--text);font-size:10px;outline:none}.turn-select:focus{border-color:var(--green2)}.recognition-privacy{margin:0 0 4px}.success-notice{background:#8fdda416;border-color:#8fdda45a;color:var(--green)}.warning-notice{background:#f0b65a14;border-color:#f0b65a55;color:#d9b578}@media(max-width:540px){.turn-select{max-width:112px;padding:8px 5px;font-size:9px}.recognition-privacy{font-size:9px}}

/* Chess-engine evaluation rail: White's advantage fills from the bottom. */
.board-surround{grid-template-columns:13px 18px minmax(0,1fr)}
.rank-labels{grid-column:2}
.chessboard{grid-column:3}
.file-labels{grid-column:3}
.evaluation-rail{grid-column:1;grid-row:1;align-self:stretch;min-height:0;width:12px;margin:3px auto 0;display:flex;flex-direction:column;overflow:hidden;border:1px solid #858b9666;border-radius:4px;background:#292d34;box-shadow:inset 0 0 0 1px #0005}
.evaluation-black{width:100%;height:50%;flex:0 0 auto;background:linear-gradient(90deg,#22262c,#373c45);transition:height .35s ease}
.evaluation-white{width:100%;height:50%;flex:0 0 auto;background:linear-gradient(90deg,#d6d1c7,#faf7ee);transition:height .35s ease}
.eval-score-pill{display:inline-flex;align-items:center;justify-content:center;padding:6px 7px;border:1px solid var(--border);border-radius:7px;background:var(--panel2);color:var(--text);font:9px "DM Mono",monospace;letter-spacing:.1px;white-space:nowrap;min-width:55px}
.board-actions{align-items:center}
@media(max-width:540px){.board-surround{grid-template-columns:10px 14px minmax(0,1fr)}.evaluation-rail{width:9px}.eval-score-pill{padding:5px 4px;min-width:48px;font-size:8px}.board-actions{gap:5px}.quiet-button{padding:6px 7px}}