[data-ui="night"]{--bg:#141311;--panel:#201e1a;--surface:#2d2820;--text:#f4ead9;--muted:#c1b49f;--border:#665742;--accent:#e6ad59;--on-accent:#251b0d;--radius:12px;--heading-font:Georgia,serif}
[data-board="walnut"]{--board-light:#d3b58a;--board-dark:#886342;--board-texture:repeating-linear-gradient(92deg,#ffffff08 0 2px,#2916040b 3px 5px)}
:root{--bg:#141311;--panel:#201e1a;--surface:#2d2820;--text:#f4ead9;--muted:#c1b49f;--border:#665742;--accent:#e6ad59;--on-accent:#251b0d;--radius:12px;--heading-font:Georgia,serif;--board-light:#d3b58a;--board-dark:#886342;--board-texture:repeating-linear-gradient(92deg,#ffffff08 0 2px,#2916040b 3px 5px)}
:root{background:var(--bg);color:var(--text);color-scheme:dark}
body{background:radial-gradient(ellipse at 0 0,#e6ad5910,transparent 50%),var(--bg)}
header{border-color:var(--border)}.brand,h1,h2{color:var(--text)}.brand,h1,h2{font-family:var(--heading-font)}
.brand span{color:var(--muted);font-family:Arial,sans-serif}
h1 em,.eyebrow,.paneltop span,.moves,.textbutton,.task summary{color:var(--accent)}
.intro>p:last-child,label,.note,.coach>p,.task p,footer,#chat-messages strong{color:var(--muted)}
.panel{background:linear-gradient(140deg,#ffffff03,transparent 60%),var(--panel);border-color:var(--border);border-radius:var(--radius);box-shadow:0 6px 24px #00000020}
button{background:var(--accent);color:var(--on-accent)}
.secondary,.history-item,.mode-tabs button{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.mode-tabs button.active{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.textbutton{background:transparent;color:var(--accent)}
input,textarea,select{background:var(--bg);color:var(--text);border-color:var(--border)}
select{max-width:100%}#time-control{min-width:170px}.pill{color:var(--accent);border-color:var(--border)}
#status{color:var(--accent)}.task,#chat-messages p{border-color:var(--border)}.server-item{border-left:3px solid var(--accent)}
button:disabled{opacity:1;background:var(--surface);color:var(--muted);border-color:var(--border);cursor:not-allowed}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.board{border:4px solid #59412c;border-radius:5px;box-shadow:0 0 0 1px #96734b,0 10px 24px #00000040}
.square,.mini-square{background-color:var(--board-light);background-image:var(--board-texture);color:#171b1d}
.square.dark,.mini-square.dark{background-color:var(--board-dark)}
.square small{color:#21170f;background:#f7e4cabb;border-radius:2px;padding:1px;font-size:10px;z-index:3}
.square.last-move{box-shadow:inset 0 0 0 3px #f2c265}
.square.last-move:before{content:'';position:absolute;right:4px;top:4px;width:7px;height:7px;background:#35230d;border:1px solid #ffe3a7;transform:rotate(45deg);z-index:2}
.square.selected,.mini-square.selected{background-color:#eac173;box-shadow:inset 0 0 0 4px #36270e}
.square.legal:after{background:#20160dd9;border:2px solid #ffeac4;z-index:2}
.square.in-check:before{content:'!';position:absolute;right:2px;top:2px;background:#9c2020;color:#fff;border-radius:50%;width:18px;height:18px;line-height:18px;font-size:14px;font-weight:bold;z-index:4}
.piece-svg{width:88%;height:88%;pointer-events:none;filter:drop-shadow(0 2px 1px #0008)}
.square.white-piece,.mini-square.white-piece{text-shadow:none}
.clocks{gap:12px;color:var(--text);font-size:clamp(20px,3vw,28px);font-weight:bold}
.clocks span{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:10px 12px;flex:1;min-width:0}
.clocks .clock-active{border-left:5px solid var(--accent)}
#appearance{margin-bottom:20px}#appearance>summary{cursor:pointer;color:var(--accent);padding:12px 0;min-height:44px}
.appearance-selectors{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;max-width:720px;margin:14px 0}
.appearance-selectors label{display:grid;gap:8px;font-weight:700}
.appearance-selectors select{width:100%;min-height:44px}
#theme-gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;max-width:330px}
.theme-card{display:flex;flex-direction:column;gap:12px;padding:14px;text-align:left;color:var(--text);background:var(--panel);border:2px solid var(--border);border-radius:var(--radius)}
.theme-card[aria-pressed=true]{border-color:var(--accent)}
.theme-card strong{font-size:15px}.theme-state{color:var(--accent);font-size:12px}
.theme-preview{display:grid;grid-template-columns:1fr 1fr;width:100%;gap:12px;background:var(--bg);padding:10px;border-radius:6px}
.preview-board{display:grid;grid-template-columns:repeat(4,1fr);aspect-ratio:1;overflow:hidden;border:2px solid #59412c}
.preview-square{background-color:var(--board-light);background-image:var(--board-texture);display:flex;align-items:center;justify-content:center;aspect-ratio:1;min-width:0}
.preview-square.dark{background-color:var(--board-dark)}
.theme-card[data-board="walnut"] .preview-square{background-color:#ecd8b6;background-image:repeating-linear-gradient(92deg,#ffffff03 0 3px,#29160404 4px 8px)}
.theme-card[data-board="walnut"] .preview-square.dark{background-color:#805b3d}
.theme-card[data-board="green"] .preview-square{background-color:#f0efda;background-image:none}
.theme-card[data-board="green"] .preview-square.dark{background-color:#587653}
.theme-card[data-board="blue"] .preview-square{background-color:#eff4f7;background-image:none}
.theme-card[data-board="blue"] .preview-square.dark{background-color:#7296af}
.preview-panel{display:flex;flex-direction:column;justify-content:space-between;gap:8px;color:var(--text);font-variant-numeric:tabular-nums;padding:6px 0}
.preview-accent{padding:8px;background:var(--accent);color:var(--on-accent);font-size:11px;border-radius:4px}
@media(max-width:760px){.board{border-width:2px}.paneltop{flex-wrap:wrap}.clocks{font-size:20px}.clocks span{padding:8px}header{gap:12px;flex-wrap:wrap}.intro{padding-bottom:16px}#chat-panel .paneltop{align-items:center}.controls>label{max-width:100%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

label:has(#custom-position),label[for=start-fen]{display:block;margin:10px 0}

[data-ui="forest"]{--bg:#f1efe3;--panel:#fffdf3;--surface:#e4e8d9;--text:#1c3026;--muted:#4a5d50;--border:#92a28c;--accent:#28533c;--on-accent:#ffffff;--radius:16px;--heading-font:Georgia,serif}
[data-board="green"]{--board-light:#e4e7ce;--board-dark:#809575;--board-texture:none}
[data-ui="nordic"]{--bg:#edf2f6;--panel:#ffffff;--surface:#e3edf5;--text:#203449;--muted:#4d6173;--border:#8fa5b7;--accent:#285a99;--on-accent:#ffffff;--radius:8px;--heading-font:Arial,sans-serif}
[data-board="blue"]{--board-light:#e2ebef;--board-dark:#8aadc3;--board-texture:none}
:root[data-ui="forest"],:root[data-ui="nordic"]{color-scheme:light}
:root[data-ui="forest"] body,:root[data-ui="nordic"] body{background:var(--bg)}
[data-board="green"] .board,[data-board="blue"] .board{border-color:var(--border);box-shadow:0 0 0 1px var(--border),0 6px 16px #0001}
[data-board="green"] .square.selected,[data-board="blue"] .square.selected{background-color:#f6d783}
[data-ui="forest"] .piece-svg,[data-ui="nordic"] .piece-svg{filter:none}
#theme-gallery{max-width:none;grid-template-columns:repeat(3,minmax(0,1fr))}
.theme-card{min-width:0}.preview-panel{min-width:0;overflow-wrap:anywhere}
.view-controls{display:flex;gap:8px;flex-wrap:wrap}
#focus-toggle,#focus-tools{font-size:12px}
.replay-buttons{gap:6px;margin-top:12px}.replay-buttons button{min-width:44px}
#replay-moves{display:flex;gap:5px;flex-wrap:wrap;max-height:115px;overflow:auto;padding:3px}
button.replay-move{padding:6px 9px;min-height:36px;background:var(--surface);color:var(--text);font-size:12px;border:1px solid var(--border)}
button.replay-move.current-move{background:var(--accent);color:var(--on-accent);text-decoration:underline;text-underline-offset:3px}
.focus-mode:not(.focus-tools-open) .focus-secondary{display:none}
.focus-mode header{padding-top:10px;padding-bottom:10px;gap:10px}
.focus-mode main{padding-top:12px}
.focus-mode .workspace{align-items:start}
.focus-mode .play{margin-bottom:12px}
.focus-mode #replay-moves{max-height:80px}
@media(max-width:760px){
 #theme-gallery{grid-template-columns:minmax(0,1fr)}
 .appearance-selectors{grid-template-columns:minmax(0,1fr)}
 .focus-mode header .brand{font-size:18px}
 .focus-mode header .brand span{display:none}
 .focus-mode header .view-controls{order:3;width:100%}
 .focus-mode header .view-controls button{flex:1;padding:8px;font-size:11px}
 .focus-mode .play{padding:10px}
 .focus-mode .play .paneltop h2{font-size:18px;margin:4px 0 10px}
 .focus-mode .clocks{margin-top:0;margin-bottom:8px}
 .focus-mode #replay-controls .controls{gap:5px}
 .focus-mode .controls{margin-top:10px;gap:8px}
}

.focus-mode:not(.focus-tools-open) .workspace:has(#chat-panel[hidden]){grid-template-columns:minmax(0,640px);justify-content:center}
.focus-mode:not(.focus-tools-open) .workspace aside:has(#chat-panel[hidden]){display:none}

/* Comfort: clear board contrast and redundant move indicators across all themes. */
[data-board="walnut"]{--board-light:#ecd8b6;--board-dark:#805b3d;--board-texture:repeating-linear-gradient(92deg,#ffffff03 0 3px,#29160404 4px 8px)}
[data-board="green"]{--board-light:#f0efda;--board-dark:#587653}
[data-board="blue"]{--board-light:#eff4f7;--board-dark:#7296af}
.square .piece-svg{width:94%;height:94%}
.square.last-move{background-color:#f4ce70;background-image:none;box-shadow:inset 0 0 0 3px #80500b}
.square.last-move:before{content:'◆';transform:none;width:15px;height:15px;font-size:13px;line-height:15px;right:2px;top:2px;background:#fff4ce;color:#4c3007;border:1px solid #4c3007;border-radius:2px;z-index:3}
.square.selected,[data-board="green"] .square.selected,[data-board="blue"] .square.selected,.mini-square.selected{background-color:#8ed8eb;background-image:none;box-shadow:inset 0 0 0 3px #14283b,inset 0 0 0 5px #fff}
.square.legal:after{content:'';position:absolute;width:28%;height:28%;min-width:12px;min-height:12px;border-radius:50%;background:#173b56;border:3px solid #fff;box-shadow:0 0 0 1px #173b56;z-index:4}
.square.legal-capture:after{width:78%;height:78%;background:transparent;border:4px solid #173b56;box-shadow:inset 0 0 0 2px #fff,0 0 0 2px #fff}
.square.in-check:before{content:none}
.check-marker{position:absolute;right:2px;top:2px;background:#b51f2a;color:#fff;border:2px solid #fff;border-radius:50%;width:22px;height:22px;line-height:18px;font-size:17px;font-weight:bold;z-index:6;box-shadow:0 0 0 1px #7e1019}
.square small{color:#17222a;background:#ffffffd9;font-size:10px}
#resign-dialog{max-width:min(430px,calc(100vw - 32px));background:var(--panel);color:var(--text);border:2px solid var(--border);border-radius:var(--radius);padding:24px}
#resign-dialog::backdrop{background:#0009}
.danger-button{background:#a52b2b;color:#fff;border:1px solid #ffcece}
button.danger-button:hover{background:#bf3232}
.analysis-episode{padding:12px 14px;margin:10px 0;border-left:3px solid #d8b765;background:#243129;border-radius:0 8px 8px 0}.analysis-episode h3{margin:0 0 8px;color:#f1d894;font-size:15px}.analysis-episode p{margin:4px 0;font-size:13px!important}.analysis-episode button{margin-top:8px}.variation-controls{margin:12px 0;padding:14px;border:1px solid #536347;border-radius:10px;background:#1c2d23}.variation-controls>strong{color:#f0d17f}.variation-controls .controls{gap:7px;margin-top:8px}.variation-controls button{font-size:12px;padding:9px 11px}.square.review-played,.square.last-move.review-played{background-color:#e69574!important;background-image:none!important;box-shadow:inset 0 0 0 4px #842c24!important}.square.review-best,.square.last-move.review-best{background-color:#8fd18b!important;background-image:none!important;box-shadow:inset 0 0 0 4px #205b35!important}.square.review-both,.square.last-move.review-both{background-color:#f0c86f!important;box-shadow:inset 0 0 0 4px #765817!important}
.course-levels{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 18px}.course-levels button{display:flex;align-items:center;justify-content:space-between;gap:18px;min-width:142px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:12px;padding:10px 14px;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.course-levels button:hover{transform:translateY(-2px);border-color:var(--accent)}.course-levels button[aria-selected="true"]{background:var(--accent);color:var(--on-accent);border-color:var(--accent);box-shadow:0 6px 18px #0003}.course-tab-name{font-weight:700}.course-tab-score{font-size:12px;font-variant-numeric:tabular-nums;opacity:.8}.course-lesson{border-top:1px solid var(--border);padding:5px 0}.course-lesson summary{display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer;font-weight:700;padding:14px 8px;list-style:none}.course-lesson summary::-webkit-details-marker{display:none}.course-lesson summary::after{content:'＋';color:var(--accent);font-size:20px;line-height:1;transition:transform .2s ease}.course-lesson[open] summary::after{content:'−';transform:rotate(180deg)}.course-lesson[open]{border-color:var(--accent)}.course-lesson>div{padding:4px 10px 18px;animation:course-reveal .28s ease both}.course-lesson-duration{color:var(--muted);font-size:12px;white-space:nowrap}.course-lesson-goal{display:inline-block;margin:0 0 10px;padding:6px 10px;border-radius:999px;background:var(--surface);color:var(--accent);font-size:12px;font-weight:700}.course-lesson-text{color:var(--text);line-height:1.7}.course-question{margin:18px 0 8px;font-size:15px;font-weight:700}.course-quiz{border:1px solid var(--border);border-radius:12px;padding:12px 14px;margin:12px 0}.course-quiz legend{padding:0 6px;color:var(--accent);font-weight:700}.course-lesson fieldset label{display:flex;align-items:flex-start;gap:10px;margin:8px 0;padding:9px 10px;border:1px solid transparent;border-radius:9px;line-height:1.5;cursor:pointer;transition:background .16s ease,border-color .16s ease}.course-lesson fieldset label:hover{background:var(--surface);border-color:var(--border)}.course-lesson input[type="radio"]{flex:0 0 auto;margin-top:3px;accent-color:var(--accent)}.course-check-answer{margin-top:8px}.course-feedback{min-height:22px;color:var(--accent);line-height:1.5}.course-feedback.is-error{color:#ffb4a8;animation:course-error .24s ease both}.course-status-success{padding:10px 12px;border-radius:10px;background:var(--surface);color:var(--accent);font-weight:700;animation:course-success .4s ease both}

.school-start{display:flex;align-items:center;gap:12px;width:max-content;max-width:100%;margin-top:20px;padding:11px 14px;border:1px solid var(--border);border-radius:15px;background:linear-gradient(115deg,var(--surface),var(--panel));color:var(--text);text-decoration:none;box-shadow:0 8px 20px #0003;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.school-start:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 10px 26px #0005}.school-start:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.school-start-mark{display:grid;place-items:center;flex:0 0 42px;height:42px;border-radius:12px;background:var(--accent);color:var(--on-accent);font-size:25px;animation:school-mark-float 3.4s ease-in-out infinite}.school-start-copy{display:grid;gap:3px}.school-start-copy strong{font-size:13px}.school-start-copy small{color:var(--muted);font-size:11px}.school-start-action{display:flex;align-items:center;gap:8px;margin-left:8px;color:var(--accent);font-size:12px;font-weight:700;white-space:nowrap}
.course-journey{position:relative;overflow:hidden;margin:12px 0 18px;padding:20px;border:1px solid var(--border);border-radius:17px;background:radial-gradient(ellipse at 100% 0%,var(--surface),transparent 62%),var(--panel)}.course-journey::after{position:absolute;content:'♞';right:14px;top:5px;color:var(--accent);opacity:.09;font-size:112px;line-height:1;transform:rotate(12deg);pointer-events:none}.course-journey-eyebrow{position:relative;z-index:1;margin:0 0 8px;color:var(--accent);font-size:10px;font-weight:800;letter-spacing:1.7px}.course-journey h3{position:relative;z-index:1;margin:0 0 6px;color:var(--text);font-family:var(--heading-font,inherit);font-size:clamp(19px,2.5vw,25px)}.course-journey-intro{position:relative;z-index:1;max-width:620px;margin:0;color:var(--muted);font-size:13px;line-height:1.55}.course-progress-row{position:relative;z-index:1;display:grid;grid-template-columns:minmax(100px,1fr) auto;align-items:center;gap:12px;margin:17px 0 15px}.course-progress-track{height:9px;overflow:hidden;border-radius:999px;background:var(--surface);box-shadow:inset 0 1px 2px #0005}.course-progress-fill{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),#f3d587);box-shadow:0 0 12px var(--accent);transition:width .55s cubic-bezier(.2,.8,.2,1)}.course-progress-label{color:var(--text);font-size:12px;font-variant-numeric:tabular-nums;white-space:nowrap}.course-steps{position:relative;z-index:1;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;padding:0;margin:0;list-style:none}.course-step{position:relative;min-width:0}.course-step:not(:last-child)::after{position:absolute;content:'';top:21px;right:-10px;width:10px;height:2px;background:var(--border);z-index:2}.course-step-button{display:grid;grid-template-columns:30px minmax(0,1fr);align-items:start;gap:8px;width:100%;height:100%;min-height:70px;padding:10px 8px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--text);text-align:left;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.course-step-button:hover{transform:translateY(-2px);border-color:var(--accent)}.course-step-number{display:grid;place-items:center;width:28px;height:28px;border:1px solid var(--border);border-radius:50%;color:var(--muted);font-size:12px;font-weight:800}.course-step-name{padding-top:2px;font-size:11px;line-height:1.35;overflow-wrap:anywhere}.course-step.is-complete .course-step-number{border-color:var(--accent);background:var(--accent);color:var(--on-accent)}.course-step.is-next .course-step-button{border-color:var(--accent);box-shadow:0 0 0 2px #e6ad5930,0 5px 16px #0003}.course-step.is-next .course-step-number{border-color:var(--accent);color:var(--accent);animation:course-pulse 2s ease-in-out infinite}.course-step.is-next .course-step-name{font-weight:700}.course-visual{display:grid;justify-items:center;gap:10px;margin:16px 0;padding:16px;border:1px solid var(--border);border-radius:15px;background:linear-gradient(145deg,var(--surface),transparent 76%)}.course-visual figcaption{max-width:420px;color:var(--muted);font-size:12px;line-height:1.55;text-align:center}.mini-board.course-visual-board{width:min(100%,280px);max-width:280px;margin:0;border:3px solid var(--border);border-radius:11px;box-shadow:0 10px 24px #0004}.course-visual-board .course-visual-square{position:relative;display:flex;align-items:center;justify-content:center;min-width:0;min-height:0;aspect-ratio:1;padding:0;line-height:1;background:var(--board-light,#e4d8bb);cursor:default}.course-visual-board .course-visual-square.dark{background:var(--board-dark,#698267)}.course-visual-board .course-visual-square.is-target:not([data-piece]){background:#9bc66d}.course-visual-board .course-visual-square.is-center{box-shadow:inset 0 0 0 2px var(--accent)}.course-visual-board .course-visual-square.is-target:not([data-piece])::after{position:absolute;content:'';width:30%;height:30%;border:2px solid #fff;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent);animation:course-pulse 1.8s ease-in-out infinite}.course-visual-board .course-visual-square.is-center:not([data-piece])::after{position:absolute;content:'';width:25%;height:25%;border-radius:50%;background:var(--accent);opacity:.78}.course-visual-board .piece-svg{position:relative;z-index:1;width:88%;height:88%}.course-square-label{position:absolute;z-index:2;top:1px;left:2px;padding:0 2px;border-radius:3px;background:#1119;color:#fff!important;font-size:clamp(6px,1.3vw,8px)!important;line-height:1.2;text-shadow:none!important}.course-visual--center .course-square-label{top:1px;left:1px}.course-castle-route{display:flex;justify-content:center;flex-wrap:wrap;gap:8px}.course-castle-route span{padding:6px 10px;border-radius:999px;background:var(--surface);color:var(--accent);font-size:11px;font-weight:700}.course-check-ways{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;width:100%}.course-check-way{display:grid;justify-items:center;align-content:center;gap:9px;min-height:92px;padding:10px 6px;border:1px solid var(--border);border-radius:12px;background:var(--panel);text-align:center;animation:course-card-in .38s ease both;animation-delay:calc(var(--way-index,0)*80ms)}.course-check-icon{color:var(--accent);font-size:clamp(20px,4vw,29px);font-weight:800;white-space:nowrap}.course-check-way strong{color:var(--text);font-size:11px;line-height:1.35}
@keyframes school-mark-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}@keyframes course-pulse{0%,100%{transform:scale(.92);opacity:.72}50%{transform:scale(1.08);opacity:1}}@keyframes course-reveal{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes course-card-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes course-success{from{opacity:0;transform:translateY(-4px);box-shadow:0 0 0 0 transparent}to{opacity:1;transform:translateY(0);box-shadow:0 0 18px #e6ad5930}}@keyframes course-error{0%,100%{transform:translateX(0)}30%{transform:translateX(-3px)}70%{transform:translateX(3px)}}
@media(max-width:760px){.school-start{width:100%;gap:9px;padding:10px}.school-start-mark{flex-basis:38px;height:38px}.school-start-action{margin-left:auto;font-size:11px}.course-journey{padding:16px}.course-journey::after{right:-7px;top:12px;font-size:88px}.course-steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.course-step:nth-child(2)::after{display:none}.course-step-button{min-height:64px;grid-template-columns:27px minmax(0,1fr);gap:6px}.course-step-number{width:25px;height:25px}.course-step-name{font-size:11px}.course-check-ways{grid-template-columns:1fr}.course-check-way{grid-template-columns:45px minmax(0,1fr);justify-items:start;min-height:58px;text-align:left;padding:8px 12px}.course-check-icon{font-size:24px}.course-visual{padding:12px}.course-lesson summary{gap:8px;padding:13px 5px}.course-progress-row{grid-template-columns:minmax(60px,1fr) auto;gap:9px}}
@media(prefers-reduced-motion:reduce){.school-start,.school-start-mark,.course-levels button,.course-lesson summary::after,.course-lesson>div,.course-progress-fill,.course-step-button,.course-step.is-next .course-step-number,.course-visual-board .course-visual-square::after,.course-check-way,.course-feedback,.course-status-success{animation:none!important;transition:none!important;scroll-behavior:auto!important}}


/* Intermediate and advanced course diagrams. */
.course-visual-board .course-visual-square.is-ray{background-color:#e6ad5970;box-shadow:inset 0 0 0 2px #81591a}
.course-visual-board .course-visual-square.is-focus{z-index:3;box-shadow:inset 0 0 0 3px var(--accent),0 0 10px var(--accent)}
.course-visual-board .course-visual-square.is-target[data-piece]{background-color:#a9d77b;box-shadow:inset 0 0 0 2px #fff,inset 0 0 0 5px #42762b}
.course-flow{display:grid;gap:10px;width:100%;max-width:740px}
.course-flow--steps{grid-template-columns:repeat(4,minmax(0,1fr))}
.course-flow--matrix{grid-template-columns:repeat(2,minmax(0,1fr))}
.course-flow-step{position:relative;display:grid;grid-template-columns:34px minmax(0,1fr);align-items:start;gap:9px;min-height:88px;padding:12px 10px;border:1px solid var(--border);border-radius:12px;background:var(--panel);animation:course-card-in .38s ease both;animation-delay:calc(var(--flow-index,0)*65ms)}
.course-flow-icon{display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--surface);color:var(--accent);font-size:17px;font-weight:800}
.course-flow-copy{display:grid;gap:5px;min-width:0}
.course-flow-copy strong{color:var(--text);font-size:12px;line-height:1.35}
.course-flow-copy small{color:var(--muted);font-size:11px;line-height:1.45}
.course-flow--steps .course-flow-step:not(:last-child)::after{position:absolute;z-index:2;top:31px;right:-10px;content:'›';display:grid;place-items:center;width:16px;height:22px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-size:20px;font-weight:800;line-height:1}
@media(max-width:760px){.course-flow--steps{grid-template-columns:repeat(2,minmax(0,1fr))}.course-flow--steps .course-flow-step:not(:last-child)::after{display:none}.course-flow-step{min-height:94px;padding:10px 8px;grid-template-columns:29px minmax(0,1fr);gap:7px}.course-flow-icon{width:28px;height:28px;font-size:15px}.course-flow-copy strong{font-size:11px}.course-flow-copy small{font-size:10px}}
@media(max-width:380px){.course-flow--matrix{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){.course-flow-step{animation:none!important}}