: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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translateY(-4px)}.art-label{position:absolute;bottom:27px;right:33px;font-size:9px;letter-spacing:.26em;color:#a8c1ac}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:20px 0 24px}.stat{background:#fff;border:1px solid var(--line);border-radius:13px;padding:18px 21px;min-height:107px}.stat>span,.stat small,.stat strong{display:block}.stat>span{font-size:10px;font-weight:800;letter-spacing:.15em;color:#89978d}.stat strong{font:800 28px Manrope,sans-serif;line-height:1.25;margin:5px 0 0}.stat small{font-size:11px;color:#94a197}.stat.accent{background:#e8f2df;border-color:#d6e9cd}.stat.accent strong{color:#3e6b43}.grid{display:grid;gap:20px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:26px 27px;box-shadow:var(--shadow)}.card-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:13px}.card h2{font-size:20px;margin:5px 0 0}.card 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var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow)}.board-top,.board-bottom{display:flex;justify-content:space-between;color:#829187;font-size:10px;font-weight:700;letter-spacing:.08em}.board-top{margin-bottom:13px}.board-top span:first-child{font-size:12px;letter-spacing:0;color:var(--ink)}.board-bottom{margin-top:14px}.board-frame{max-width:540px}.chessboard{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));border:6px solid #292929;border-radius:0;overflow:hidden;box-shadow:0 8px 18px rgba(34,63,41,.15)}.square{border:0;border-radius:0;position:relative;display:grid;place-items:center;min-width:0;min-height:0;padding:0}.square.light{background:#eeeed2}.square.dark{background:#769656}.square.selected{box-shadow:inset 0 0 0 5px #e5c864;background:#c4c66d}.square:hover:not(:disabled){filter:brightness(1.08)}.square .piece{display:block;width:92%;height:92%;object-fit:contain;pointer-events:none;user-select:none}.rank-label,.file-label{position:absolute;font-size:clamp(9px,1.2vw,14px);font-weight:800;pointer-events:none}.rank-label{top:3px;left:4px}.file-label{bottom:2px;right:4px}.square.light .rank-label,.square.light .file-label{color:#282828}.square.dark .rank-label,.square.dark .file-label{color:#eeeed2}.exercise-panel{padding:30px}.exercise-panel h2{font-size:28px;margin:8px 0 12px}.exercise-panel p{color:#718178;font-size:13px;line-height:1.6}.exercise-meta{font-size:11px;color:#819388;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px 0;margin:24px 0}.answer-form{display:grid;gap:12px}.answer-form .primary,.answer-form .secondary{justify-self:start}.feedback{font-size:12px;line-height:1.5;margin-top:14px;padding:0}.feedback.good,.feedback.bad{padding:12px;border-radius:8px}.feedback.good{background:#e7f3e7;color:#356f44}.feedback.bad{background:#fff1ea;color:#9c5b3e}.next{margin-top:13px}.opening-training .chessboard.compact{width:min(100%,320px);margin:15px auto}.opening-training p{margin-top:10px}.opening-library{margin-top:20px}.opening-entry{border-top:1px solid var(--line);padding:17px 0}.opening-heading{display:flex;justify-content:space-between;gap:15px;margin-bottom:7px}.opening-heading strong{font-size:14px}.opening-heading span{font-size:11px;color:#8a998d}.reply-row{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:8px 0 8px 18px}.reply-text strong,.reply-text small{display:block}.reply-text strong{font-size:12px}.reply-text small{font-size:10px;color:#95a198;margin-top:3px}.reply-form{display:flex;gap:6px}.reply-form 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}}