:root{--ink:#1e2b25;--muted:#748078;--line:#e4e9e3;--paper:#f5f7f2;--white:#fff;--green:#244937;--lime:#d4e48c;--soft:#edf3e8;--shadow:0 12px 35px rgba(29,50,37,.055)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:'DM Sans',system-ui,sans-serif;font-size:15px}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.shell{min-height:100vh;display:grid;grid-template-columns:245px minmax(0,1fr)}.sidebar{background:#fff;border-right:1px solid var(--line);padding:31px 18px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;gap:12px;align-items:center;padding:0 12px;font-family:Manrope,sans-serif;font-size:18px;font-weight:800;letter-spacing:-.04em;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:39px;height:39px;border-radius:11px;background:var(--green);color:var(--lime);font-size:27px;line-height:1}.brand small{display:block;color:#86938a;font:500 10px 'DM 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input{height:31px;width:100px}.toast{position:fixed;right:22px;bottom:22px;background:#2c5138;color:#fff;padding:13px 17px;border-radius:10px;max-width:350px;box-shadow:0 12px 30px #1d352a35;opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .2s,transform .2s;font-size:12px;z-index:10}.toast.show{opacity:1;transform:translateY(0)}.toast.bad{background:#a24f40}.login-page{min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at 75% 10%,#dbe9c2,transparent 34%),#f4f7f0}.login-card{width:min(420px,calc(100% - 30px));background:#fff;padding:34px;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);display:grid;gap:16px}.login-card .brand{padding:0;margin-bottom:32px}.login-card h1{font-size:33px;margin:0}.login-card p{font-size:13px;color:#89988b;line-height:1.5}.login-card .primary{justify-self:stretch}.login-card .feedback{margin:0}
@media(max-width:1100px){.shell{grid-template-columns:200px minmax(0,1fr)}.main{padding-inline:25px}.hero>div:first-child{padding-left:30px}.hero-piece{font-size:200px}.training-layout{grid-template-columns:minmax(320px,1fr) minmax(250px,.8fr)}}
@media(max-width:850px){.shell{display:block}.sidebar{height:auto;position:static;flex-direction:row;align-items:center;padding:12px 18px;gap:18px}.brand{font-size:15px;padding:0}.brand-mark{width:32px;height:32px;font-size:22px}.brand small{font-size:8px}.nav{display:flex;margin:0;gap:3px}.nav-item{padding:8px;font-size:11px;gap:4px}.nav-item span{font-size:16px;width:17px}.sidebar-bottom{display:none}.main{padding:0 20px 40px}.topbar{height:58px;margin-bottom:20px}.training-layout{grid-template-columns:1fr}.board-frame{max-width:570px;margin:auto}.hero{min-height:280px}.hero-piece{font-size:175px}}
@media(max-width:600px){.sidebar{display:block}.brand{margin-bottom:12px}.nav{justify-content:space-between}.nav-item b{display:none}.hero{display:block;min-height:0}.hero>div:first-child{padding:28px}.hero-art{display:none}.hero h1{font-size:35px}.stats{grid-template-columns:repeat(2,1fr);gap:9px}.stat{padding:14px}.grid.two{grid-template-columns:1fr}.card{padding:21px}.topbar .eyebrow{font-size:8px}.job-status{font-size:10px}.section-heading h1{font-size:34px}.count-pill{font-size:9px;padding:8px}.board-card,.exercise-panel{padding:15px}.game-row{flex-wrap:wrap;gap:6px}.game-provider{width:70px}.opening-heading{display:block}.opening-heading span{display:block;margin-top:4px}.reply-row{display:block}.reply-form{margin-top:8px}}
.analytics-stats{margin-top:0}.analytics-comment{font-size:14px!important;color:var(--ink)!important;max-width:none!important}.analytics-trend{background:#eef5e9;border-radius:9px;padding:12px;color:#4c7054!important;max-width:none!important}.analytics-windows{display:grid;gap:17px}.analytics-window-heading{display:flex;justify-content:space-between;gap:10px;font-size:12px}.analytics-window-heading span,.analytics-window small{color:#849388}.analytics-window small{display:block;margin-top:5px;font-size:10px}.analytics-track{height:9px;background:#edf2e9;border-radius:99px;margin-top:9px;overflow:hidden}.analytics-bar{display:block;height:100%;background:#7ca465;border-radius:99px}.analytics-recommendations{margin-top:20px}.analytics-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.analytics-action{background:#f5f8f2;border:1px solid #e5ece1;border-radius:10px;padding:17px}.analytics-action strong,.analytics-action small{display:block}.analytics-action strong{font-size:13px}.analytics-action small{font-size:11px;color:#7c8d7e;margin-top:7px}.analytics-action p{font-size:12px;color:#3e5843;margin:12px 0 0}@media(max-width:1000px){.analytics-actions{grid-template-columns:1fr}}@media(max-width:600px){.analytics-stats{grid-template-columns:repeat(2,1fr)}.analytics-window-heading{font-size:11px}}
.chessboard{position:relative}.square{touch-action:none}.square .piece{width:80%;height:80%}.square:disabled{opacity:1;cursor:default}.square.drag-origin .piece{opacity:.38}.rank-label,.file-label{font-size:clamp(8px,1vw,11px);line-height:1;z-index:1}.rank-label{top:2px;left:2px}.file-label{bottom:2px;right:2px}.drag-ghost{position:fixed;width:clamp(40px,6vw,78px);height:clamp(40px,6vw,78px);object-fit:contain;transform:translate(-50%,-50%);pointer-events:none;z-index:100;filter:drop-shadow(0 7px 5px #1d352a55)}.board-arrow{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:3;filter:drop-shadow(0 1px 2px #29292999)}.square.answer-from{box-shadow:inset 0 0 0 4px #e7a928}.square.answer-to{box-shadow:inset 0 0 0 4px #e7a928}.feedback p{margin:8px 0 0!important;color:inherit!important;font-size:12px!important}
.training-layout{grid-template-columns:minmax(0,690px) minmax(250px,1fr)}.board-frame{max-width:646px;margin-inline:auto}.opening-lesson{margin-bottom:20px;scroll-margin-top:20px}.opening-lesson .board-frame{max-width:646px}.opening-lesson .exercise-panel{min-height:250px}.line-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.arrow-legend{display:flex;gap:18px;margin-top:15px;color:#68786c;font-size:11px}.arrow-legend span{display:flex;align-items:center;gap:7px}.legend-swatch{width:20px;height:5px;border-radius:5px;display:inline-block}.legend-swatch.played{background:#d75d58}.legend-swatch.opponent{background:#4b8ec8}.legend-swatch.best{background:#e7a928}
@media(max-width:1100px){.training-layout{grid-template-columns:minmax(0,1fr) minmax(250px,.8fr)}}
@media(max-width:850px){.training-layout{grid-template-columns:1fr}.board-frame,.opening-lesson .board-frame{max-width:646px}}
[hidden]{display:none!important}
[hidden]{display:none!important}

/* Keep the chess mark legible; its shape must not depend on a font glyph. */
.brand{gap:12px;font-family:system-ui,sans-serif;font-size:17px;line-height:1.25;letter-spacing:-.015em}
.brand-mark{display:block;flex:0 0 auto;width:40px;height:40px;object-fit:contain;background:transparent;border-radius:10px}
.brand>span{min-width:0}.brand small{font-family:system-ui,sans-serif;font-size:9px;letter-spacing:.06em;line-height:1.45;white-space:normal}
.sidebar .brand{padding:0 4px}
.login-card .brand{font-size:20px;gap:14px;margin-bottom:22px}
.login-card .brand-mark{width:48px;height:48px;border-radius:12px}
.login-card .brand small{font-size:10px;margin-top:5px;letter-spacing:.07em}
@media(max-width:480px){.login-card{padding:26px 24px}.login-card .brand{font-size:18px;gap:12px}.login-card .brand-mark{width:44px;height:44px}.login-card .brand small{font-size:9px}}
/* Daily plan, evidence-linked analytics and short practice sessions. */
.daily-plan{background:#edf3e7;border:1px solid #cfddc4;margin-bottom:20px}.daily-plan h1{font-size:clamp(28px,3vw,40px);line-height:1.15;margin:14px 0}.daily-plan p{font-size:16px;line-height:1.65;max-width:760px}.daily-plan button{margin:12px 12px 0 0}.overview-openings{margin-top:22px}.overview-openings summary{cursor:pointer;font-weight:700}.recent-game-button{display:block;width:100%;text-align:left;border-bottom:1px solid #e3e9df;border-radius:0;padding:16px 0;font-size:14px;line-height:1.65}.profile-filter{margin:16px 0;display:flex;flex-wrap:wrap;gap:12px;align-items:center}.profile-filter select,#practice-size{font:inherit;padding:10px;max-width:100%;border:1px solid #cbd8c3;border-radius:8px;background:#fff;min-height:44px}.profile-filter label{font-weight:700}.profile-filter p{flex-basis:100%;color:#66755f}.analytics-action button{margin-top:14px;display:block;text-align:left;min-height:42px}.practice-layout{display:grid;grid-template-columns:minmax(280px,580px) minmax(280px,1fr);gap:26px;align-items:start;margin-top:16px}.practice-board-card{padding:14px;background:white;border:1px solid #dce5d5;border-radius:16px}.practice-layout .chessboard{width:100%;max-width:min(100%,calc(100vh - 240px));margin:auto}.practice-layout .exercise-panel{padding:24px}.practice-actions{display:grid;gap:12px;margin:20px 0}.practice-actions button{min-height:44px}.practice-actions .answer-form{margin:8px 0}.practice-layout .exercise-panel p{font-size:15px;line-height:1.65}.replay-controls{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}.replay-controls button{min-height:40px}.replay-controls [aria-pressed=true]{background:#edf3e6;color:#284d39}.replay-nav{display:flex;width:100%;align-items:center;justify-content:space-between;gap:12px}.replay-nav span{font-size:13px}.practice-board-card .board-top{font-size:12px;gap:8px;display:flex;justify-content:space-between;margin-bottom:12px}#practice-status:empty{display:none}#practice-result h2{font-size:28px}#practice-result button{margin:12px 12px 0 0}#daily-last{margin-bottom:22px}#game-dialog{width:min(980px,95vw);max-height:94vh;overflow:auto;padding:24px;border:1px solid #cbd8c3;border-radius:16px;color:var(--ink);background:#f6f8f3}#game-dialog::backdrop{background:#142b22aa}.game-review-layout{display:grid;grid-template-columns:minmax(240px,1fr) minmax(220px,.65fr);gap:24px}.game-review-layout .chessboard{max-width:500px;margin:auto}#game-errors{display:grid;gap:10px;margin:14px 0}#game-close{float:right}
@media(max-width:1100px){.practice-layout{grid-template-columns:minmax(0,1fr) minmax(260px,.85fr)}}
@media(max-width:850px){.practice-layout,.game-review-layout{grid-template-columns:1fr}.practice-layout .chessboard{max-width:520px}.practice-layout .exercise-panel{padding:20px}.daily-plan p{font-size:15px}#game-dialog{padding:16px}.profile-filter{display:block}.profile-filter select{width:100%;margin-top:8px}}

/* Focused error practice: the board and the next action form one workspace. */
body:has(#page-mistakes.active #practice-workspace:not([hidden])) .shell{grid-template-columns:1fr}
body:has(#page-mistakes.active #practice-workspace:not([hidden])) .sidebar,body:has(#page-mistakes.active #practice-workspace:not([hidden])) .topbar,body:has(#page-mistakes.active #practice-workspace:not([hidden])) #page-mistakes>.section-heading{display:none}
body:has(#page-mistakes.active #practice-workspace:not([hidden])) .main{padding:12px 24px 28px;max-width:1440px;width:100%;margin:auto}
#practice-status{font-size:13px;min-height:18px;margin:0;text-align:right}
#practice-workspace{grid-template-columns:minmax(280px,1.55fr) minmax(300px,1fr);gap:18px;align-items:start;margin:0}
.practice-instruction{grid-column:1/-1}
.practice-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px}
#practice-progress{font-size:14px;letter-spacing:0;color:#536b5b}
#practice-title{font-size:26px;line-height:1.2;margin:2px 0 6px}
#practice-prompt{font-size:16px;margin:0;line-height:1.4}
#practice-workspace .practice-board-card{padding:8px;border:0;background:transparent}
#practice-board{width:100%;max-width:min(100%,calc(100dvh - 205px));margin:auto}
#practice-workspace .board-top{font-size:14px;margin-bottom:8px}
#practice-workspace .exercise-panel{padding:22px;font-size:17px}
#practice-feedback p{font-size:17px;line-height:1.5}
#practice-feedback .practice-eval{font-size:14px;color:#5b6e60}
.practice-takeaway{border-left:3px solid #6f9455;padding:8px 12px}
.practice-error{background:#fff1e4;border-radius:10px;padding:12px;color:#7a4621}
.practice-hint{background:#f0f5e8;border-radius:10px;padding:12px}
.practice-input,.practice-detail{font-size:14px;margin:12px 0;line-height:1.5}
.practice-input summary,.practice-detail summary{cursor:pointer;color:#315c45;padding:8px 0}
#practice-actions{gap:12px}#practice-actions>.secondary{font-size:16px;min-height:48px;width:100%}
#practice-finish{font-size:13px;font-weight:500;color:#68776b;margin-top:14px}
#practice-lines{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:14px}
#practice-lines .text-button{font-size:14px;line-height:1.35;padding:9px 0}
#practice-lines [aria-pressed=true]{text-decoration:underline;text-underline-offset:5px}
#practice-lines small{display:block;width:100%;color:#637868}
#practice-lines .replay-nav{width:100%;display:flex;justify-content:space-between;align-items:center}
#practice-board .previous-move{box-shadow:inset 0 0 0 3px #6292a4}
#practice-board .hint-piece{box-shadow:inset 0 0 0 4px #e4a137}
#practice-lobby{max-width:720px}#practice-lobby select{margin-bottom:16px}#practice-result{max-width:820px}
@media(max-width:850px){
body:has(#page-mistakes.active #practice-workspace:not([hidden])) .main{padding:6px 12px 24px}
#practice-workspace{grid-template-columns:1fr;gap:10px}
.practice-instruction{grid-column:1}#practice-title{font-size:22px}#practice-prompt{font-size:14px}
.practice-toolbar .text-button{padding:4px 0}#practice-progress{font-size:13px}
#practice-board{max-width:min(100%,460px)}#practice-workspace .practice-board-card{padding:0}
#practice-workspace .exercise-panel{padding:14px}#practice-feedback p{font-size:16px}
#practice-lines{gap:0 14px}#practice-lines .text-button{font-size:13px}
}

#practice-status{padding:0;border:0}
.practice-toolbar .text-button{padding:5px 0}

#practice-focus{font:inherit;padding:10px;max-width:100%;border:1px solid #cbd8c3;border-radius:8px;background:#fff;min-height:44px}

/* Continuous chapters: stable panel and persistent board. */
.chapter-modes{display:flex;gap:10px;flex-wrap:wrap}.chapter-modes button{font-size:14px;flex:1}.chapter-navigation{margin-bottom:18px}.chapter-navigation summary{cursor:pointer;font-weight:700}.chapter-nav-list{display:grid;max-height:240px;overflow:auto}.chapter-nav-list button{text-align:left;padding:10px}.chapter-source-warning{font-size:13px!important;background:#fff4dd;padding:12px;border-radius:8px;color:#806025}.chapter-promotion,.chapter-conflict{max-width:460px;border:1px solid #dae4d6;border-radius:16px;padding:24px}.chapter-promotion button{margin:5px}.chapter-conflict::backdrop{background:#152b2366}#lesson-board .piece{position:relative;z-index:2}.lesson-panel .lesson-content{min-height:54px}.lesson-panel #lesson-title{min-height:32px}.course-card>.text-button{margin-left:12px}
.chapter-coverage{display:block;margin-top:.5rem}
.chapter-nav-list .chapter-current{background:#e9f0e3;border-left:4px solid #547b47;color:#234b39;border-radius:8px;padding-left:6px}.chapter-current-label{display:block;font-size:12px;font-weight:600;line-height:1.5;color:#547b47}.chapter-transition{font-size:14px;color:#547b47}

.brand {text-decoration:none;color:inherit}.job-status:empty {display:none}