/* ZeroTrainingAIChess — original, local-only interface. No CDN, webfont or framework. */
:root{color-scheme:light;--page:#f6f7f2;--paper:#fffefa;--ink:#243d32;--muted:#798479;--line:#dfe5da;--green:#174d3d;--green-hover:#0f3b2e;--green-soft:#e8efe5;--sage:#88a18d;--tile-light:#e9ecd9;--tile-dark:#83a18b;--purple:#716090;--purple-soft:#f0edf5;--red:#b35e53;--shadow:0 8px 30px -20px #253d3250;--serif:Georgia,'Times New Roman',serif;--sans:Inter,'Segoe UI',-apple-system,BlinkMacSystemFont,Arial,sans-serif}
:root.dark,body.dark-theme{color-scheme:dark;--page:#14251f;--paper:#1b3027;--ink:#e7eee3;--muted:#a2b3a5;--line:#334a3d;--green:#b5d8a6;--green-hover:#cbe8be;--green-soft:#263e30;--sage:#a9c5ae;--tile-light:#c7d4bd;--tile-dark:#638772;--purple:#c3aedc;--purple-soft:#342e40;--red:#e2a298;--shadow:0 8px 30px -20px #0008}
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progress::-webkit-progress-value{background:var(--purple)}.tune-progress progress::-moz-progress-bar{background:var(--purple)}.tune-chart-wrap{margin-top:15px;border:1px solid var(--line);border-radius:8px;padding:10px 10px 6px}.chart-heading{display:flex;justify-content:space-between;font-size:9px;color:var(--muted)}.chart-heading strong{color:var(--purple);font-weight:650;font-size:13px}.tune-chart-wrap svg{display:block;width:100%;margin-top:3px}.chart-caption{font-size:8px;color:var(--muted);text-align:center}.chart-grid{stroke:var(--line);stroke-width:1;stroke-dasharray:3 5}.chart-trial{fill:var(--paper);stroke:var(--purple);stroke-width:2}.chart-line{fill:none;stroke:var(--purple);stroke-width:2.5;stroke-linejoin:round}.chart-label{fill:var(--muted);font:9px var(--sans)}.holdout-result{background:var(--green-soft);color:var(--green);font-size:9px;padding:8px 10px;border-radius:6px;margin-bottom:10px}.zc-app summary{cursor:pointer;font-size:10px;color:var(--muted);padding:10px 0}.trial-table{overflow:auto;max-height:200px;margin-top:10px}.trial-row{display:grid;grid-template-columns:25px 1fr 48px;gap:5px;padding:5px 3px;font-size:9px;border-bottom:1px solid var(--line);color:var(--muted)}.trial-row strong{text-align:right;color:var(--purple)}.app-footer{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:20px 0 6px;margin-top:37px;font-size:9px;color:var(--muted)}.app-footer>span:first-child{font-weight:500}.footer-separator{margin:0 12px;color:var(--sage)}.footer-dot{margin:0 9px}.app-footer button{border:0;background:none;color:var(--muted);padding:0;font-size:9px}.app-footer button:hover{color:var(--green);text-decoration:underline}.error-banner{margin:16px 0 0 42px;padding:12px 14px;border:1px solid color-mix(in srgb,var(--red) 40%,transparent);color:var(--red);border-radius:8px;font-size:12px;background:var(--paper)}.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);max-width:min(90vw,540px);padding:12px 20px;border-radius:9px;background:var(--ink);color:var(--paper);box-shadow:0 8px 30px #0002;font-size:12px;z-index:20}.app-dialog{position:fixed;border:1px solid var(--line);border-radius:18px;padding:32px;background:var(--paper);color:var(--ink);width:min(470px,calc(100vw - 32px));max-height:90vh;overflow:auto;box-shadow:0 25px 100px #06190f40;font:14px/1.6 var(--sans)}.app-dialog::backdrop{background:#102b236b;backdrop-filter:blur(5px)}.app-dialog h2{font:normal 35px/1.2 var(--serif);letter-spacing:-1px;margin:10px 0 10px}.dialog-close{position:absolute;right:12px;top:12px;font-size:25px;font-weight:300}.app-dialog>.muted,.app-dialog form>.muted{font-size:12px}.side-choices{border:0;padding:0;margin:23px 0;display:flex;gap:12px}.side-choices legend{font-size:11px;color:var(--muted);margin-bottom:9px}.side-choices label{flex:1;position:relative}.side-choices input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}.side-choices label>span{display:flex;flex-direction:column;align-items:center;border:1px solid var(--line);border-radius:10px;padding:14px 8px;gap:4px;background:var(--page)}.side-choices input:checked+span{border-color:var(--green);background:var(--green-soft);box-shadow:inset 0 0 0 1px var(--green)}.side-choices input:focus-visible+span{outline:3px solid #c5a459;outline-offset:3px}.side-choices strong{font-size:12px}.side-choices small{font-size:10px;color:var(--muted)}.choice-piece{width:32px;height:39px;stroke:var(--ink);stroke-width:1.4;fill:var(--paper);margin-bottom:5px}.choice-piece.black-choice{fill:var(--ink);stroke:var(--paper)}.form-label{display:flex;flex-direction:column;gap:7px;font-size:11px;color:var(--muted);margin:14px 0}.zc-app textarea{width:100%;font-family:ui-monospace,Consolas,monospace;font-size:11px;resize:vertical}.fen-details{margin:8px 0 20px}.full-width{width:100%;justify-content:space-between}.form-error{font-size:12px;color:var(--red);margin:10px 0!important}.help-dialog{width:min(540px,calc(100vw - 32px))}.help-dialog h3{font-size:13px;margin-top:22px}.help-dialog p{font-size:12px;color:var(--muted);margin-top:6px;line-height:1.8}.shortcut-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:25px;border-top:1px solid var(--line);padding-top:20px;font-size:11px;color:var(--muted)}.shortcut-grid kbd{font-size:11px;padding:4px 7px;margin-right:6px}.promotion-dialog{text-align:center}.promotion-dialog h2{font-size:28px}.promotion-choices{display:flex;gap:7px;margin:20px 0}.promotion-choice{background:var(--green-soft);border:1px solid var(--line);border-radius:8px;padding:6px;flex:1;min-width:0;color:var(--ink);font-size:10px}.promotion-choice:hover{border-color:var(--green)}.promotion-choice img{width:100%;display:block}.skip-link{position:fixed;left:15px;top:-100px;padding:10px 15px;background:var(--green);color:var(--paper)!important;z-index:100;border-radius:8px}.skip-link:focus{top:10px}.status-orb.thinking .icon{animation:breathe 1.1s ease-in-out infinite}.status-orb.thinking{border-color:var(--sage)}@keyframes breathe{0%,100%{opacity:.4;transform:scale(.94)}50%{opacity:1;transform:scale(1.06)}}

/* Demo readability upgrade: make the entire right-side inspector easy to read on stage and in screenshots. */
.game-layout{grid-template-columns:minmax(0,1fr) 392px;gap:32px}
.inspector{font-size:16px;gap:18px}
.status-card{padding:22px 24px;min-height:118px;gap:16px}
.status-orb{width:52px;height:52px}
.status-orb .icon{width:29px;height:29px}
.status-card h2{font-size:42px;line-height:1.08;letter-spacing:-.8px}
.status-card p{font-size:15px;line-height:1.45}
.status-card .eyebrow.small{font-size:11px;letter-spacing:1.8px}
.panel{padding:18px 18px 16px}
.panel-heading h3,.evaluation-panel h3,.game-panel h3{font-size:19px;line-height:1.2}
.subtle-label{font-size:11px;letter-spacing:1.3px}
.tab-bar{margin-bottom:12px}
.game-panel .tab{font-size:15px;padding:12px 8px}
.count-badge{font-size:11px;min-width:20px;height:20px;padding:0 6px}
.move-list{font-size:14px;line-height:1.55;height:250px}
.empty-history strong{font-size:18px;line-height:1.3}
.empty-history span{font-size:14px;line-height:1.5}
.replay-bar{font-size:13px;padding-top:12px}
.analysis-body{font-size:14px}
.analysis-heading .eyebrow.small{font-size:11px;letter-spacing:1.6px}
.search-stats strong{font-size:22px}
.search-stats span{font-size:12px}
.candidate-lines,.analysis-explanation{font-size:14px;line-height:1.6}
.analysis-explanation{margin-top:10px}
.engine-settings strong{font-size:15px}
.engine-settings span{font-size:13px;line-height:1.45}
.segmented button{font-size:14px;padding:10px 14px}
.feature-list{gap:14px}
.feature-row{font-size:14px;line-height:1.45}
.feature-row output{font-size:13px;font-weight:600}
.micro-note{font-size:12px;line-height:1.55}
.app-footer{font-size:11px}
.app-footer button{font-size:11px}

@media(min-width:1450px){.workspace{padding-top:42px}.hero{padding-bottom:37px}.topbar{padding-left:60px;padding-right:60px}}
@media(max-width:1100px){.topbar{padding:16px 24px;gap:15px}.brand strong{font-size:15px}.main-nav{gap:0}.nav-item{padding:9px 11px}.local-badge{font-size:8px;padding:8px 4px}.workspace{padding:27px 26px 18px}.game-layout{grid-template-columns:minmax(0,1fr) 360px;gap:24px}.hero h1{font-size:43px}.hero-note{padding-left:18px}.hero-note span{max-width:185px;line-height:1.6}.keyboard-note{display:none}.tool-group{gap:0}.tool-button{padding:9px 6px}.board-toolbar{gap:8px}.board-toolbar .primary{padding:11px 13px}.tuning-header h3{gap:4px}.optional-label{font-size:5.5px}.status-card{padding:18px 20px}.profile-pill{display:none}}
@media(max-width:900px){.game-layout{grid-template-columns:1fr;max-width:680px;margin:0 auto;gap:28px}.hero{max-width:680px;margin:0 auto}.hero-note{display:none}.hero h1{font-size:44px}.inspector{display:grid;grid-template-columns:1fr 1fr;gap:16px}.status-card,.game-panel{grid-column:1/-1}.game-panel .move-list{height:160px}.topbar-right .local-badge{display:none}.topbar{gap:10px}.brand small{font-size:8px;letter-spacing:2px}.brand-mark{width:35px;height:40px}.brand strong{font-size:14px}.nav-item{font-size:11px;padding:9px}.app-footer{max-width:680px;margin-left:auto;margin-right:auto}.footer-separator{margin:0 7px}.footer-dot{margin:0 6px}.app-footer>span:last-child{white-space:nowrap}.profile-pill{display:inline-block}.keyboard-note{display:inline}.board-toolbar .primary{padding:12px 18px}.tool-group{gap:8px}.tool-button{padding:10px}}
@media(max-width:600px){.topbar{padding:16px 18px 13px;flex-wrap:wrap;column-gap:10px;row-gap:16px}.main-nav{order:3;width:100%;justify-content:space-between;padding:4px}.nav-item{flex:1;justify-content:center;font-size:11px}.topbar-right{margin-left:auto}.brand{gap:9px}.brand strong{font-size:15px}.brand small{font-size:8px}.workspace{padding:24px 15px 16px}.hero{padding:0 5px 25px}.hero h1{font-size:39px;letter-spacing:-1.5px;margin:9px 0}.hero>.eyebrow,.hero .eyebrow{font-size:7px;letter-spacing:1.25px}.hero p{font-size:11px;max-width:270px;line-height:1.8}.board-area{grid-template-columns:16px minmax(0,1fr);gap:7px}.evaluation-rail{font-size:8px;padding:8px 0;gap:6px}.eval-track{width:7px}.rail-label{font-size:6px}.board-frame{padding:9px 9px 0 1px;grid-template-columns:14px minmax(0,1fr);grid-template-rows:auto 18px;border-radius:7px}.rank-labels,.file-labels{font-size:8px}.player-row{padding-left:23px}.opponent-row{padding-bottom:12px}.player-info strong{font-size:12px}.player-info>span{font-size:9px}.avatar{width:32px;height:32px;border-radius:8px}.avatar .icon{width:18px;height:18px}.profile-pill{font-size:6px;margin-left:0}.untimed{font-size:9px;gap:3px}.untimed .icon{width:14px}.player-row{gap:8px}.human-row{padding-top:12px;padding-bottom:12px;min-height:63px}.turn-pill{font-size:9px;padding:5px 8px}.board-toolbar{margin-left:23px;gap:6px;padding-top:13px}.board-toolbar .primary{font-size:10px;padding:10px;gap:5px;min-height:40px}.board-toolbar .primary .icon{width:15px}.tool-group{gap:1px}.tool-button{padding:7px 8px;flex-direction:column;gap:3px;font-size:8px}.tool-button .icon{width:17px;height:17px}.board-footnote{margin:13px 0 0 23px;font-size:9px}.keyboard-note{display:none}.inspector{display:flex;gap:13px}.status-card{padding:18px}.status-card p{font-size:11px}.move-list{height:175px!important}.game-panel .tab{font-size:13px}.engine-settings strong{font-size:13px}.engine-settings span{font-size:11px}.segmented button{font-size:11px;padding:8px}.tuning-header h3{font-size:12px}.optional-label{font-size:6px}.tuning-header>div>span{font-size:10px}.tuning-intro>span{font-size:11px;max-width:none}.tuning-bottom{font-size:9px}.panel h3{font-size:15px}.feature-row{font-size:12px}.feature-row output{font-size:11px}.app-footer{flex-direction:column;gap:8px;margin-top:26px;text-align:center;align-items:center}.error-banner{margin-left:23px}.app-dialog{padding:26px 23px}.app-dialog h2{font-size:30px}.feature-list{gap:12px}.evaluation-panel{padding-bottom:14px}.micro-note{font-size:11px}.learning-notice,.tune-message{font-size:10px}.tune-inputs label{font-size:10px}.weight-item{font-size:10px}.tune-actions .button{font-size:11px;min-height:41px}.apply-actions .text-button{font-size:10px}.tune-progress>div{font-size:10px}}
@media(prefers-reduced-motion:reduce){.zc-app *{scroll-behavior:auto!important;animation:none!important;transition:none!important}}


/* Stage-demo readability overrides */
#chessApp .count-badge{font-size:12px;min-width:22px;height:22px;padding:0 6px}
#chessApp .panel-heading h3{line-height:1.2}
#chessApp .analysis-heading .text-button{font-size:14px}
#chessApp .tuning-header .optional-label{font-size:10px}
#chessApp .weight-grid .weight-item strong{font-size:14px}
#chessApp .weight-grid .weight-item span{font-size:13px}