/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,::backdrop,:after,:before{--tw-border-style:solid}}}@layer theme{:host,:root{--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";--font-mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4,0,.2,1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,::backdrop,:after,:before{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}:host,html{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,pre,samp{font-family:var(--default-mono-font-family,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}menu,ol,ul{list-style:none}audio,canvas,embed,iframe,img,object,svg,video{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,optgroup,select,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit,::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-millisecond-field,::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.sticky{position:sticky}.container{width:100%}@media (min-width:40rem){.container{max-width:40rem}}@media (min-width:48rem){.container{max-width:48rem}}@media (min-width:64rem){.container{max-width:64rem}}@media (min-width:80rem){.container{max-width:80rem}}@media (min-width:96rem){.container{max-width:96rem}}.block{display:block}.contents{display:contents}.flex{display:flex}.hidden{display:none}.border{border-style:var(--tw-border-style);border-width:1px}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}.play-page{max-width:1180px;margin:0 auto;padding:48px 24px}.play-page h1{margin:20px 0;font-size:clamp(30px,4vw,52px);line-height:1.15}.play-page h2{margin:12px 0;font-size:24px}.play-intro{margin:24px 0;padding:28px}.play-intro p{margin:14px 0}.live-layout{grid-template-columns:minmax(0,620px) minmax(0,1fr);align-items:start;gap:28px;display:grid}.live-details{min-width:0;padding:24px}.live-details p{margin:16px 0}.live-details input{width:100%;margin:8px 0 16px}.player-label{overflow-wrap:anywhere;padding:10px 0}.live-moves{max-height:280px;margin:16px 0;padding-left:36px;list-style:decimal;overflow:auto}.live-moves li{padding:5px 8px}.live-moves li:nth-child(odd){background:var(--surface2)}.live-moves span{width:45%;display:inline-block}.game-list{gap:12px;display:grid}.game-link{flex-wrap:wrap;justify-content:space-between;gap:16px;padding:20px;display:flex}.about-lead{max-width:760px;font-size:22px}.about-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;display:grid}@media (max-width:850px){.about-grid,.live-layout{grid-template-columns:1fr}.play-page{padding:28px 16px}}:root{--bg:#111713;--surface:#1b231e;--surface2:#222c25;--line:#303b32;--text:#f1f3ec;--muted:#a1ada2;--accent:#b3df87;--ink:#1b2915;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);margin:0;font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}a,button,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}button{color:inherit}input,select,textarea{color:var(--text);border:1px solid var(--line);background:#141b16;border-radius:8px;min-width:0;padding:11px 13px}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:2px}a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2,h3{letter-spacing:-.04em;line-height:1.2}h1{font-size:clamp(2.4rem,5vw,4.2rem)}h2{font-size:clamp(1.8rem,3vw,2.4rem)}h3{font-size:1.2rem}p{color:var(--muted)}.container{width:min(1200px,100% - 64px);margin:auto}.site-header{border-bottom:1px solid var(--line);z-index:10;background:#111713f2;position:relative}.header-inner{gap:36px;max-width:1440px;margin:auto;padding:22px 36px}.brand,.header-inner{align-items:center;display:flex}.brand{letter-spacing:-1.5px;gap:9px;font-size:30px;font-weight:800;line-height:1}.brand-mark{font-size:42px}.brand-dot,.brand-mark{color:var(--accent)}.brand small{letter-spacing:2px;color:var(--muted);margin-top:6px;font-size:8px;font-weight:600;display:block}.header-inner nav{white-space:nowrap;gap:27px;font-size:14px;display:flex}.header-inner nav a{color:#bac4ba}.header-inner nav a:hover,.subtle-link:hover{color:var(--accent)}.header-search{color:var(--muted);align-items:center;gap:10px;width:200px;margin-left:auto;display:flex}.header-search input{background:0 0;border:0;width:100%;padding:0;font-size:13px}.header-actions{white-space:nowrap;align-items:center;gap:18px;font-size:14px;display:flex}.button{background:var(--accent);color:var(--ink);border:1px solid #0000;border-radius:7px;justify-content:center;align-items:center;gap:10px;padding:13px 23px;font-weight:700;line-height:1.4;transition:background .15s;display:inline-flex}.button:hover{background:#c7ec9f}.button.secondary{color:var(--text);background:0 0;border-color:#45503e}.button.secondary:hover{background:var(--surface2)}.button.small{padding:10px 15px;font-size:14px}.hero{grid-template-columns:1.08fr 1fr;gap:80px;padding-top:70px;padding-bottom:66px;display:grid}.eyebrow,.hero{align-items:center}.eyebrow{letter-spacing:1.9px;color:var(--accent);gap:10px;margin-bottom:18px;font-size:12px;font-weight:700;display:flex}.eyebrow>span{background:var(--accent);border-radius:50%;width:6px;height:6px}.hero h1{letter-spacing:-.06em;margin-bottom:24px;font-size:clamp(3rem,5.3vw,4.8rem);font-weight:700;line-height:1.08}.hero h1 em{color:var(--accent);font-style:normal}.hero-copy>p{max-width:440px;margin-bottom:28px;font-size:17px;line-height:1.8}.hero-buttons{gap:12px;display:flex}.hero-benefits{color:var(--muted);flex-wrap:wrap;gap:14px;margin-top:22px;font-size:12px;display:flex}.hero-benefits span{align-items:center;gap:5px;display:flex}.hero-benefits svg{color:var(--accent)}.hero-note{color:var(--muted);align-items:center;gap:16px;margin-top:40px;font-size:12px;line-height:1.7;display:flex}.hero-note strong{color:#ced6c9;font-weight:500}.note-pieces{letter-spacing:-6px;background:var(--surface);border:1px solid var(--line);color:var(--accent);border-radius:30px;padding:5px 14px 5px 8px;font-size:25px}.hero-visual{padding:12px 0;position:relative}.hero-board-card{background:var(--surface);border:1px solid #3b493a;border-radius:13px;padding:16px;box-shadow:0 22px 70px #0004}.board-card-top{color:var(--muted);justify-content:space-between;align-items:center;margin:0 1px 13px;font-size:12px;display:flex}.board-card-top>span:first-child{letter-spacing:1.4px;color:#d2dbcb;align-items:center;gap:7px;font-size:10px;font-weight:700;display:flex}.live-dot{background:var(--accent);border-radius:50%;width:6px;height:6px}.chess-shell{aspect-ratio:1;width:100%;position:relative}.cg-wrap,.chess-board{width:100%;height:100%}cg-board{background-color:#d7dec3;background-image:conic-gradient(#73906b 25%,transparent 0 50%,#73906b 0 75%,transparent 0);background-size:25% 25%}cg-container{border-radius:3px;overflow:hidden}.cg-wrap coords{font-weight:700;font-size:11px!important}.cg-wrap coords.ranks{color:#25391e}.cg-wrap coords.files{color:#213519}.hero-board-controls{color:var(--muted);align-items:center;gap:12px;padding:14px 0;font-size:12px;display:flex}.move-chip{color:var(--accent);background:#b3df8717;border-radius:4px;padding:4px 11px;font-size:15px;font-weight:700}.hero-board-controls>div{gap:5px;margin-left:auto;display:flex}.hero-board-controls button{background:#2a352c;border:1px solid #3b483d;border-radius:4px;padding:5px;display:flex}.hero-insight{border-left:2px solid var(--accent);color:var(--accent);background:#263025;border-radius:5px;gap:12px;padding:13px;display:flex}.hero-insight svg{flex-shrink:0}.hero-insight p{color:#c8d3c0;margin:0;font-size:12px;line-height:1.6}.visual-caption{text-align:center;color:#73836f;letter-spacing:2px;margin-top:17px;font-size:9px;display:block}.learning-strip{border-block:1px solid var(--line);background:#171f19}.learning-strip>.container{grid-template-columns:repeat(3,1fr);padding-block:25px;display:grid}.learning-strip .container>div{border-right:1px solid var(--line);justify-content:center;align-items:center;gap:18px;display:flex}.learning-strip .container>div:last-child{border:0}.learning-strip svg{color:var(--accent);width:26px;height:26px}.learning-strip strong{font-size:15px;display:block}.learning-strip small{color:var(--muted);margin-top:4px;font-size:12px;display:block}.section{padding-top:68px}.section-heading{justify-content:space-between;align-items:end;gap:24px;margin-bottom:27px;display:flex}.section-heading h2{margin:0}.section-heading .eyebrow{margin-bottom:12px;font-size:10px}.subtle-link{color:#cbd8c4;white-space:nowrap;text-underline-offset:5px;font-size:13px;text-decoration:underline}.category-grid{grid-template-columns:repeat(6,1fr);gap:12px;display:grid}.category-card{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:20px 16px;transition:border-color .15s}.category-card:hover{border-color:var(--accent)}.category-piece{color:var(--accent);margin-bottom:14px;font-size:33px;display:block}.category-card h3{letter-spacing:-.02em;margin-bottom:8px;font-size:14px}.category-card p{margin:0;font-size:11px}.category-card p span{padding:0 5px}.course-grid{grid-template-columns:repeat(3,1fr);gap:24px;display:grid}.course-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;transition:border-color .2s,transform .2s;display:block;overflow:hidden}.course-card:hover{border-color:#647859;transform:translateY(-3px)}.course-art{background:#27382b;height:175px;position:relative;overflow:hidden}.mini-grid{background-image:linear-gradient(#ffffff09 1px,#0000 0),linear-gradient(90deg,#ffffff09 1px,#0000 0);background-size:44px 44px;position:absolute;inset:-50%;transform:perspective(400px)rotateX(25deg)rotate(-18deg)}.art-piece{color:#bdcfae;text-shadow:8px 12px 2px #0003;font-size:195px;line-height:1.5;position:absolute;top:-40px;right:36px;transform:rotate(-10deg)}.art-label{letter-spacing:2px;color:#e6efdb;font-size:10px;font-weight:700;position:absolute;bottom:20px;left:21px}.tone-1 .course-art{background:#343a44}.tone-1 .art-piece{color:#a4b4c5}.tone-2 .course-art{background:#44372c}.tone-2 .art-piece{color:#d7bb91}.tone-3 .course-art{background:#38334a}.tone-3 .art-piece{color:#b8aad2}.premium{letter-spacing:1px;color:#e9d099;background:#151a16bd;border-radius:4px;align-items:center;gap:5px;padding:4px 8px;font-size:9px;display:flex;position:absolute;top:12px;right:12px}.course-content{padding:22px}.level{color:var(--accent);align-items:center;gap:6px;margin-bottom:12px;font-size:11px;display:inline-flex}.level i{background:var(--accent);border-radius:2px;width:6px;height:6px}.course-content h3{margin-bottom:10px;font-size:20px}.course-content p{-webkit-line-clamp:2;-webkit-box-orient:vertical;min-height:44px;font-size:13px;line-height:1.7;display:-webkit-box;overflow:hidden}.course-meta{border-top:1px solid var(--line);color:var(--muted);gap:20px;padding-top:16px;font-size:12px;display:flex}.course-meta span{align-items:center;gap:7px;display:flex}.how-panel{border:1px solid var(--line);background:#1a231b;border-radius:12px;padding:38px}.how-panel>div>p{font-size:14px}.steps{grid-template-columns:repeat(3,1fr);gap:40px;margin-top:32px;display:grid}.steps span{color:var(--accent);margin-bottom:15px;font-size:13px;display:block}.steps h3{font-size:17px}.steps p{margin:0;font-size:13px}.final-cta{text-align:center;padding-block:70px}.final-cta>svg{color:var(--accent);margin:0 auto 15px}.final-cta h2{margin-bottom:13px}.final-cta p{margin-bottom:25px;font-size:14px}.footer{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;gap:20px;margin-top:35px;padding:30px 36px;font-size:12px;display:flex}.footer .brand{color:var(--accent);font-size:24px}.page-content{min-height:70vh;padding-block:54px}.lead{max-width:680px;font-size:17px}.filter-bar{background:var(--surface);border:1px solid var(--line);border-radius:10px;gap:12px;margin-block:32px 20px;padding:20px;display:flex}.search-field{flex:1;align-items:center;gap:10px;display:flex}.search-field input{background:0 0;border:0;width:100%;padding:8px}.result-count{margin-bottom:25px;font-size:13px}.empty-state{text-align:center;border:1px dashed var(--line);color:var(--muted);border-radius:10px;padding:55px 25px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:26px}.breadcrumb{color:var(--muted);flex-wrap:wrap;gap:10px;margin-bottom:26px;font-size:13px;display:flex}.breadcrumb a:hover{color:var(--accent)}.detail-grid{grid-template-columns:1.6fr 1fr;gap:40px;display:grid}.lesson-row{border-bottom:1px solid var(--line);align-items:center;gap:18px;padding:20px 0;display:flex}.lesson-row:last-child{border:0}.lesson-row:hover strong{color:var(--accent)}.lesson-row>span:first-child{background:var(--surface2);color:var(--accent);border-radius:8px;padding:8px 14px}.lesson-row>div{flex:1}.lesson-row strong{font-size:15px;display:block}.lesson-row small{color:var(--muted)}.progress-track{background:#354034;border-radius:10px;height:6px;margin-block:12px;overflow:hidden}.progress-track>span{background:var(--accent);height:100%;display:block}.stats{grid-template-columns:repeat(3,1fr);gap:20px;margin-block:30px;display:grid}.stat strong{color:var(--accent);font-size:32px;display:block}.stat span{color:var(--muted);font-size:13px}.auth-card{max-width:440px;margin:70px auto;padding:34px}.auth-card h1{font-size:32px}.auth-card form,.form-stack{gap:18px;display:grid}.auth-card label,.form-stack label{gap:7px;font-size:14px;display:grid}.auth-card p{font-size:14px}.auth-card a{color:var(--accent)}.message{background:#b3df8710;border:1px solid #b3df8735;border-radius:7px;padding:12px;font-size:14px}.error{color:#ffb5ac;background:#a829201a;border-color:#a8292066}.text-button{color:var(--muted);background:0 0;border:0;padding:5px;font-size:13px}.avatar{background:var(--accent);width:34px;height:34px;color:var(--ink);border-radius:50%;place-items:center;font-weight:700;display:grid}.skip-link{background:var(--accent);color:var(--ink);z-index:100;padding:10px;position:absolute;top:-100px;left:10px}.skip-link:focus{top:10px}.promotion-dialog{background:var(--surface);border:1px solid var(--accent);z-index:20;flex-wrap:wrap;gap:5px;padding:15px;display:flex;position:absolute;inset:20%}.promotion-dialog p{width:100%}.lesson-layout{grid-template-columns:1.2fr 1fr;align-items:start;gap:28px;display:grid}.lesson-heading{justify-content:space-between;align-items:start;gap:16px;margin-bottom:27px;display:flex}.lesson-heading h1{margin-bottom:10px;font-size:32px}.lesson-heading p{margin:0}.video-wrap{aspect-ratio:16/9;background:#0b100d;border-radius:9px;position:relative;overflow:hidden}.video-wrap iframe,.video-wrap video{border:0;width:100%;height:100%}.teaching-video{text-align:center;background:radial-gradient(at top,#30432d,#111913 80%);flex-direction:column;justify-content:center;align-items:center;height:100%;padding:25px;display:flex}.teaching-video .video-piece{color:var(--accent);font-size:62px;line-height:1.1}.teaching-video h2{margin:14px 0;font-size:22px}.teaching-video p{max-width:420px;margin-bottom:0;font-size:14px}.video-toolbar{color:var(--muted);align-items:center;gap:12px;margin-top:12px;font-size:12px;display:flex}.video-toolbar input[type=range]{accent-color:var(--accent);flex:1;padding:0}.icon-button{border:1px solid var(--line);background:var(--surface2);border-radius:6px;justify-content:center;align-items:center;min-width:38px;min-height:38px;padding:9px;display:inline-flex}.lesson-section{margin-top:24px}.lesson-section h2{font-size:19px}.board-toolbar{justify-content:space-between;gap:10px;margin-bottom:13px;font-size:13px}.board-controls,.board-toolbar{align-items:center;display:flex}.board-controls{justify-content:center;gap:8px;margin-top:15px}.board-controls .move-counter{color:var(--muted);text-align:center;min-width:48px;margin:0 8px;font-size:12px}.move-list{flex-wrap:wrap;gap:7px;margin-top:15px;display:flex}.move-list button{background:var(--surface2);border:1px solid var(--line);border-radius:5px;padding:6px 10px;font-size:14px}.move-list button.active{background:var(--accent);color:var(--ink);border-color:var(--accent)}.explanation{background:#233022;border:1px solid #41513a;border-radius:9px;padding:22px}.explanation .label{color:var(--accent);letter-spacing:1px;align-items:center;gap:8px;margin-bottom:12px;font-size:12px;display:flex}.explanation p{color:#d7dfd0;margin:0;font-size:15px}.engine-panel{background:var(--surface);border:1px solid var(--line);border-radius:8px;margin-top:20px;padding:20px}.engine-result{grid-template-columns:1fr 2fr;gap:15px;margin-top:16px;display:grid}.engine-result strong{color:var(--accent);font-size:25px}.engine-result small{color:var(--muted);font-size:11px;display:block}.engine-pv{color:var(--muted);overflow-wrap:anywhere;grid-column:1/-1;font-size:13px}.lesson-actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-top:25px;display:flex}.save-status{color:var(--muted);font-size:12px}.check-label{align-items:center;gap:8px;font-size:13px;display:flex}.check-label input{accent-color:var(--accent);width:17px;height:17px}.admin-grid{grid-template-columns:1fr 2fr;gap:25px;display:grid}.admin-table{gap:15px;display:grid}.admin-move{background:#141b16;border-radius:8px;grid-template-columns:80px 1fr;gap:12px;padding:16px;display:grid}.admin-move textarea{grid-column:1/-1;min-height:70px}.form-row{gap:12px;display:flex}.form-row>*{flex:1}.tabs{flex-wrap:wrap;gap:10px;margin-block:20px;display:flex}.tabs a{border:1px solid var(--line);border-radius:6px;padding:9px 16px}.full-width{width:100%}.notice{border-left:3px solid var(--accent);background:var(--surface);color:var(--muted);margin-block:18px;padding:12px 16px;font-size:13px}.lesson-nav{justify-content:space-between;gap:15px;margin-block:25px;display:flex}.lesson-nav a{color:var(--accent);font-size:14px}@media (min-width:1500px){.hero{gap:110px}.hero-board-card{max-width:480px;margin-left:auto}}@media (max-width:1100px){.header-search{display:none}.header-actions{margin-left:auto}.header-inner{gap:26px;padding:20px 24px}.hero{gap:40px}.hero h1{font-size:clamp(2.9rem,5.7vw,4.2rem)}.category-grid{grid-template-columns:repeat(3,1fr)}.category-card{grid-template-columns:40px 1fr;column-gap:10px;display:grid}.category-piece{grid-row:1/3;margin:0}.course-grid{gap:16px}.course-content{padding:18px}.lesson-layout{gap:20px}.container{width:calc(100% - 48px)}}@media (max-width:760px){.container{width:calc(100% - 32px)}.header-inner{flex-wrap:wrap;gap:15px;padding:17px 16px}.brand{font-size:26px}.brand-mark{font-size:34px}.header-inner nav{border-top:1px solid var(--line);order:3;justify-content:center;gap:30px;width:100%;padding-top:14px;font-size:13px}.header-actions{gap:12px}.header-actions .small{padding:9px 11px;font-size:12px}.login-link{font-size:12px}.hero{grid-template-columns:1fr;gap:30px;padding-block:40px}.hero h1{font-size:clamp(3.2rem,10vw,4.5rem)}.hero-copy>p{font-size:16px}.hero-note{margin-top:25px}.hero-visual{width:100%;max-width:480px;margin:auto}.learning-strip>.container{grid-template-columns:1fr;padding-block:8px}.learning-strip .container>div{border-right:0;border-bottom:1px solid var(--line);justify-content:start;padding:17px 25px}.section{padding-top:42px}.section-heading{flex-direction:column;align-items:start;gap:12px}.section-heading h2{font-size:27px}.category-grid{grid-template-columns:repeat(2,1fr);gap:10px}.category-card{padding:17px 12px}.course-grid{grid-template-columns:repeat(2,1fr)}.course-art{height:140px}.art-piece{font-size:155px;right:10px}.course-content h3{font-size:18px}.course-content p{font-size:12px}.course-meta{gap:12px;font-size:10px}.steps{grid-template-columns:1fr;gap:24px}.how-panel{padding:25px}.steps h3,.steps span{margin-bottom:8px}.footer{flex-wrap:wrap;padding:24px 16px;font-size:11px}.footer span:last-child{width:100%}.filter-bar{flex-wrap:wrap;padding:14px}.search-field{flex-basis:100%}.filter-bar select{flex:1;width:100%}.filter-bar .button{width:100%}.admin-grid,.detail-grid,.lesson-layout{grid-template-columns:1fr}.lesson-heading{flex-wrap:wrap}.lesson-heading h1{font-size:27px}.page-content{padding-block:32px}.stats{gap:10px}.stat{padding:17px}.stat strong{font-size:27px}.auth-card{max-width:none;margin:35px 16px;padding:26px}.hero-benefits{gap:10px;font-size:11px}.form-row{flex-direction:column}.lesson-layout .board-panel{padding:14px}.lesson-layout{gap:24px}.lesson-layout>.lesson-left{display:contents}.lesson-layout .video-section{order:0}.lesson-layout .board-column{order:1}.lesson-layout .lesson-details{order:2}.lesson-layout .explanation{order:3}}@media (max-width:450px){.course-grid{grid-template-columns:1fr}.course-art{height:170px}.art-piece{font-size:185px;right:35px}.course-content p{font-size:14px}.course-meta{font-size:12px}.category-card h3{font-size:13px}.category-card{grid-template-columns:30px 1fr}.category-piece{font-size:27px}.hero-buttons .button{padding:13px 16px;font-size:14px}.hero h1{font-size:3.05rem}.hero-note{font-size:11px}.brand small{letter-spacing:1.4px;font-size:7px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.chess-shell .cg-wrap cg-board{background-repeat:repeat;background-size:25% 25%}.cg-wrap square.move-dest{background:radial-gradient(#173a2580 22%,#0000 24%)}.cg-wrap square.selected{background:#e4d57780}.cg-wrap square.check{background:radial-gradient(#e84040b0,#0000)}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}