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var(--line);border-radius:12px;color:var(--text-soft);background:var(--surface-high);cursor:pointer;font-size:11px}.empty-state{display:grid;place-items:center;align-content:center;gap:10px;min-height:360px;padding:40px;text-align:center}.empty-state>svg{width:40px;height:40px;color:var(--text-faint)}.empty-state h2{margin:5px 0 0;font-size:23px;font-weight:560}.empty-state p{max-width:460px;margin:0 0 14px;color:var(--text-soft);line-height:1.6}.analysis-layout{--analysis-inspector-width: clamp(300px, 24vw, 400px);--analysis-gap: clamp(18px, 2vw, 28px);position:relative;display:grid;grid-template-columns:minmax(0,1fr) var(--analysis-inspector-width);grid-template-rows:minmax(0,1fr) 88px;gap:var(--analysis-gap);height:100%}.analysis-progress{position:absolute;top:10px;right:calc(var(--analysis-inspector-width) + var(--analysis-gap));left:20px;z-index:20;display:grid;grid-template-columns:auto 1fr auto auto;align-items:center;gap:12px;min-height:38px;padding:7px 12px;border-radius:17px;color:var(--text-soft);background:var(--surface-high);box-shadow:8px 9px 18px var(--shadow-dark);font-size:10px}.analysis-progress progress{width:100%;height:4px;overflow:hidden;border:0;border-radius:99px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--surface-ink)}.analysis-progress progress::-webkit-progress-bar{background:var(--surface-ink)}.analysis-progress progress::-webkit-progress-value{background:var(--text-soft)}.analysis-progress progress::-moz-progress-bar{background:var(--text-soft)}.analysis-progress button{border:0;color:var(--text-soft);background:transparent;cursor:pointer}.board-surface{display:grid;grid-template-columns:clamp(58px,6vw,90px) minmax(0,1fr);column-gap:clamp(16px,2vw,30px);align-items:center;justify-content:center;min-width:0;min-height:0;padding:20px;border:1px solid var(--line);border-radius:34px;background:linear-gradient(145deg,var(--surface-high),var(--surface-low));box-shadow:18px 20px 42px var(--shadow-dark),-8px -8px 24px var(--shadow-light),inset 1px 1px var(--shadow-light)}.board-surface.variation-active{box-shadow:18px 20px 42px var(--shadow-dark),-8px -8px 24px var(--shadow-light),inset 0 0 0 1px color-mix(in srgb,var(--class-great) 55%,transparent)}.board-holder{width:min(100%,calc(100dvh - 300px),1120px);max-width:none;max-height:100%;margin-inline:auto;aspect-ratio:1}.chess-board{position:relative;display:grid;grid-template-columns:repeat(8,1fr);width:100%;aspect-ratio:1;overflow:hidden;border-radius:13px;background:var(--board-dark);box-shadow:13px 15px 28px var(--shadow-dark),-5px -5px 15px var(--shadow-light);isolation:isolate}.board-square{position:relative;display:grid;place-items:center;min-width:0;aspect-ratio:1;padding:0;border:0;border-radius:0;background:transparent}.board-square.light{background:var(--board-light)}.board-square.dark{background:var(--board-dark)}.board-square.from:after,.board-square.to:after,.board-square.source:after{position:absolute;top:4px;right:4px;bottom:4px;left:4px;z-index:4;border:2px solid rgb(255 255 255 / .38);border-radius:10px;background:#ffffff0e;content:""}.board-square.to:after{border-color:color-mix(in srgb,var(--class-best) 75%,white)}.board-square.source:after{border-color:var(--class-great)}.board-piece{position:relative;z-index:3;width:82%;height:82%;object-fit:contain;filter:drop-shadow(0 4px 3px rgb(0 0 0 / .48))}.rank-label,.file-label{position:absolute;z-index:5;color:#ffffff94;font:600 10px ui-monospace,monospace}.rank-label{top:5px;left:6px}.file-label{right:6px;bottom:4px}.best-arrow{position:absolute;top:0;right:0;bottom:0;left:0;z-index:7;width:100%;height:100%;pointer-events:none}.best-arrow line{stroke:var(--class-best);stroke-width:2.4;filter:drop-shadow(0 2px 4px black)}.best-arrow marker path{fill:var(--class-best);stroke:none}.evaluation-column{align-self:stretch;display:grid;grid-template-rows:auto minmax(0,1fr) auto;justify-items:center;gap:clamp(8px,1.2vw,14px);min-height:0;padding:clamp(12px,1.5vw,18px) clamp(7px,1vw,12px);border:1px solid var(--line);border-radius:clamp(17px,1.7vw,24px);background:linear-gradient(145deg,var(--surface-high),var(--surface-low));box-shadow:10px 12px 24px var(--shadow-dark),-4px -4px 12px var(--shadow-light),inset 1px 1px var(--shadow-light)}.evaluation-column strong,.evaluation-column small{font:600 clamp(10px,1vw,14px) ui-monospace,monospace}.evaluation-column 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button{border:0;color:var(--text-soft);background:transparent;cursor:pointer;font-size:10px}.verdict-reading{display:grid;grid-template-columns:46px 1fr;gap:15px;padding:17px 20px 20px}.class-orb{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;color:#fff;background:var(--classification, var(--text-faint));box-shadow:5px 6px 12px var(--shadow-dark),inset 1px 1px #ffffff57}.class-orb svg{width:23px;height:23px;stroke-width:2}.verdict-reading>div{min-width:0}.verdict-reading b{display:block;margin-bottom:6px;color:var(--classification, var(--text-soft));font-size:12px}.verdict-reading strong{display:block;font-size:21px;font-weight:650;letter-spacing:-.02em}.verdict-reading p{margin:8px 0 0;color:var(--text-soft);font-size:12px;line-height:1.48}.quiet-actions{display:flex;gap:14px;margin-top:10px}.quiet-actions 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ui-monospace,monospace}.settings-account{display:flex;align-items:center;justify-content:space-between;gap:18px;max-width:560px;min-height:58px;padding:8px 8px 8px 16px;border:1px solid var(--line);border-radius:17px;background:var(--surface-low)}.settings-account span{min-width:0;overflow:hidden;color:var(--text-soft);font-size:11px;text-overflow:ellipsis;white-space:nowrap}.settings-account button,.mobile-signout{min-width:88px;min-height:42px;padding:0 15px;border:1px solid var(--line);border-radius:13px;color:var(--text);background:var(--surface-high);cursor:pointer;font-size:11px}.settings-account button:hover,.mobile-signout:hover{border-color:var(--line-strong)}.settings-notices{display:flex;flex-wrap:wrap;gap:10px 18px}.settings-notices 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var(--shadow-dark),inset 1px 1px var(--shadow-light)}.engine-profile-option.active strong:before{border-color:var(--text);background:var(--text);box-shadow:0 0 0 3px color-mix(in srgb,var(--text) 15%,transparent)}.engine-profile-option small{overflow:hidden;color:var(--text-faint);font-size:9px;line-height:1.4;text-overflow:ellipsis}.engine-profile-option em{color:var(--text-faint);font-size:8px;font-style:normal;font-weight:500;letter-spacing:.04em;text-transform:uppercase}.settings-inline-note{display:block;max-width:440px;margin-top:8px;color:var(--text-faint);font-size:9px;line-height:1.45}.unavailable-setting{color:var(--text-faint);font-size:11px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:grid;place-items:center;padding:24px;background:#0000009e;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.import-modal{width:min(620px,100%);padding:26px;border:1px solid var(--line-strong);border-radius:30px;background:var(--surface-high);box-shadow:24px 30px 80px #000000b3}.import-modal>header{display:flex;justify-content:space-between;gap:30px}.import-modal>header span,.import-modal label>span{color:var(--text-faint);font-size:10px}.import-modal h2{margin:7px 0 8px;font-size:30px}.import-modal header p{margin:0;color:var(--text-soft);font-size:12px;line-height:1.6}.import-modal header button{flex:0 0 auto;display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:15px;color:var(--text-soft);background:var(--surface-low);cursor:pointer}.import-modal header svg{width:18px}.import-modal label{display:grid;gap:8px;margin-top:22px}.import-modal input,.import-modal textarea{width:100%;border:1px solid var(--line-strong);border-radius:16px;color:var(--text);background:var(--surface-low);box-shadow:inset 4px 4px 9px var(--shadow-dark),inset -2px -2px 6px var(--shadow-light)}.import-modal input{height:50px;padding:0 14px}.import-modal textarea{min-height:130px;padding:13px;resize:vertical}.or-rule{position:relative;height:1px;margin:24px 0 0;background:var(--line);text-align:center}.or-rule span{position:relative;top:-8px;padding:0 10px;color:var(--text-faint);background:var(--surface-high);font-size:10px}.form-error{margin:13px 0 0;color:var(--danger);font-size:11px}.import-modal footer{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:20px}.import-modal footer small{color:var(--text-faint)}.import-modal footer button{min-height:45px;padding:0 17px;border:1px solid var(--line);border-radius:17px;color:var(--text);background:var(--surface-low);box-shadow:7px 8px 16px var(--shadow-dark),-3px -3px 9px var(--shadow-light);cursor:pointer}.identity-modal{width:min(520px,100%);padding:26px;border:1px solid var(--line-strong);border-radius:30px;background:var(--surface-high);box-shadow:24px 30px 80px 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label:has(input:checked){border-color:var(--line-strong);background:var(--surface-high);box-shadow:inset 1px 1px var(--shadow-light),5px 6px 13px var(--shadow-dark)}.identity-names input{accent-color:var(--text)}.identity-empty{margin-top:24px;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--surface-low)}.identity-empty strong{color:var(--text);font-size:13px}.identity-empty button,.identity-modal footer button{min-height:45px;padding:0 15px;border:1px solid var(--line);border-radius:16px;color:var(--text);background:var(--surface-low);box-shadow:5px 6px 13px var(--shadow-dark),-2px -2px 7px var(--shadow-light);cursor:pointer}.identity-empty button{margin-top:18px}.identity-modal footer{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:9px;margin-top:22px}.identity-modal footer .identity-confirm{color:var(--surface-high);background:var(--text);box-shadow:5px 6px 13px var(--shadow-dark)}.identity-modal button:disabled{cursor:wait;opacity:.65}.account-modal{width:min(520px,100%);padding:26px;border:1px solid var(--line-strong);border-radius:30px;background:var(--surface-high);box-shadow:24px 30px 80px #000000b3}.account-page{min-height:100dvh;display:grid;place-items:center;align-items:safe center;overflow:auto;padding:clamp(24px,6vw,72px) 20px;background:linear-gradient(145deg,var(--canvas),var(--canvas-deep))}.account-page-shell{display:grid;justify-items:stretch;gap:14px;width:min(520px,100%)}.account-page-brand{justify-self:center;padding:0;border:0;color:var(--text);background:transparent;cursor:pointer;font-size:17px;font-weight:700;letter-spacing:-.03em}.account-page .account-modal{width:100%}.account-page .account-modal>header{align-items:flex-start}.account-modal>header{display:flex;justify-content:space-between;gap:24px}.account-modal>header span{color:var(--text-faint);font-size:10px}.account-modal h2{margin:7px 0 8px;font-size:28px;letter-spacing:-.045em}.account-modal header p{max-width:390px;margin:0;color:var(--text-soft);font-size:12px;line-height:1.6}.account-modal header button{flex:0 0 auto;display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:15px;color:var(--text-soft);background:var(--surface-low);cursor:pointer}.account-modal header svg{width:18px}.account-form{display:grid;gap:14px;margin-top:22px}.account-field{display:grid;gap:7px}.account-field label{color:var(--text-soft);font-size:11px;font-weight:600}.account-field input{width:100%;height:46px;padding:0 13px;border:1px solid var(--line-strong);border-radius:14px;color:var(--text);background:var(--surface-low);box-shadow:inset 3px 3px 8px var(--shadow-dark),inset -2px -2px 6px var(--shadow-light)}.account-field input:focus-visible{border-color:var(--focus);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--focus) 18%,transparent)}.account-password-field{position:relative}.account-password-field input{padding-right:52px}.account-password-toggle{position:absolute;top:50%;right:8px;display:grid;place-items:center;width:32px;height:32px;padding:0;border:0;border-radius:9px;color:var(--text-faint);background:transparent;cursor:pointer;transform:translateY(-50%)}.account-password-toggle svg{width:16px;height:16px;stroke:currentColor}.account-password-toggle:hover{color:var(--text);background:var(--surface-high)}.account-password-toggle:focus-visible{color:var(--text);outline:2px solid var(--focus);outline-offset:2px}.account-prompt-status.is-error{color:var(--danger)}.account-field-hint{color:var(--text-faint);font-size:9px;line-height:1.4}.account-form-submit{width:100%;min-height:46px;border:1px solid var(--text);border-radius:15px;cursor:pointer;font-size:12px;font-weight:650}.account-text-button{justify-self:center;min-height:30px;padding:0 4px;border:0;color:var(--text-soft);background:transparent;cursor:pointer;font-size:10px}.account-text-button:hover{color:var(--text)}.account-forgot{margin-top:-4px;justify-self:end}.account-divider{display:flex;align-items:center;gap:10px;margin-top:23px;color:var(--text-faint);font-size:10px}.account-divider:before,.account-divider:after{flex:1;height:1px;background:var(--line);content:""}.account-divider span{white-space:nowrap}.account-loading{color:var(--text-soft);font-size:13px}.account-providers{display:grid;gap:9px;margin-top:24px}.account-providers>button{display:grid;grid-template-columns:34px minmax(0,1fr) auto;align-items:center;gap:12px;min-height:58px;padding:8px 13px 8px 9px;border:1px solid var(--line);border-radius:18px;color:var(--text);background:var(--surface-low);box-shadow:5px 6px 13px var(--shadow-dark),-2px -2px 7px var(--shadow-light),inset 1px 1px var(--shadow-light);cursor:pointer;text-align:left}.account-providers>button:hover{border-color:var(--line-strong);background:var(--surface-high)}.account-providers>button:disabled{cursor:wait;opacity:.68}.account-provider-mark{display:grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);border-radius:12px;color:var(--text-soft);background:var(--surface-high)}.account-provider-logo{width:19px;height:19px}.account-provider-logo-google{fill:none;stroke:none}.account-provider-logo-github{fill:currentColor;stroke:none}.account-providers>button>span:nth-child(2){display:grid;gap:3px;min-width:0}.account-providers strong{font-size:12px;font-weight:650}.account-providers small{color:var(--text-faint);font-size:9px}.account-provider-arrow{color:var(--text-faint);font-size:16px}.account-connected{display:flex;align-items:center;gap:12px;margin-top:24px;padding:14px;border:1px solid var(--line);border-radius:18px;background:var(--surface-low);box-shadow:inset 1px 1px var(--shadow-light)}.account-connected>span:last-child{display:grid;gap:3px}.account-connected strong{font-size:12px;font-weight:650}.account-connected small{color:var(--text-faint);font-size:10px}.account-connected-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:12px;color:var(--good);background:color-mix(in srgb,var(--good) 14%,var(--surface-high))}.account-connected-mark svg{width:16px}.account-prompt-status{min-height:18px;margin:17px 0 0;color:var(--text-soft);font-size:10px;line-height:1.5}.account-modal footer{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:19px;padding-top:18px;border-top:1px solid var(--line)}.account-modal footer small{color:var(--text-faint);font-size:9px;line-height:1.4}.account-modal footer button{flex:0 0 auto;min-height:42px;padding:0 15px;border:1px solid var(--line);border-radius:15px;color:var(--text);background:var(--surface-low);box-shadow:6px 7px 14px var(--shadow-dark),-3px -3px 8px var(--shadow-light);cursor:pointer;font-size:11px}.account-entry-actions{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:8px}.account-entry-actions .account-mode-switch{min-height:32px;padding:0 3px;border:0;color:var(--text-soft);background:transparent;box-shadow:none;font-size:10px}.account-entry-actions .account-mode-switch:hover{color:var(--text)}.account-page{min-height:100dvh;display:grid;place-items:center;padding:28px;background:var(--canvas)}.account-page-shell{display:grid;gap:16px;width:min(560px,100%)}.account-page-brand{justify-self:start;padding:0;border:0;color:var(--text);background:transparent;cursor:pointer;font-size:18px;font-weight:650;letter-spacing:-.05em}.account-page .account-modal{width:100%;box-shadow:12px 15px 30px var(--shadow-dark),-5px -5px 14px var(--shadow-light),inset 1px 1px var(--shadow-light)}@media(max-width:1270px){.app-frame{grid-template-columns:104px minmax(0,1fr)}.side-rail{margin-left:18px;border-radius:32px}.app-stage{padding-left:34px;padding-right:18px}.analysis-layout{--analysis-inspector-width: 326px;--analysis-gap: 20px}.board-surface{padding:14px}.review-rail{gap:13px}.verdict-reading{grid-template-columns:38px 1fr;gap:11px;padding:13px 15px 15px}.class-orb{width:36px;height:36px}.verdict-reading strong{font-size:18px}.verdict-reading p{font-size:10px}.playback-buttons{gap:24px}.game-row{grid-template-columns:30px minmax(220px,1.3fr) 90px 130px 75px 94px;gap:12px}.home-module{gap:0 16px;padding:28px}.home-module h2{font-size:25px}.home-game-row{grid-template-columns:34px minmax(220px,1fr) 90px 75px 18px;gap:12px}.concept-detail{grid-template-columns:minmax(300px,470px) minmax(210px,1fr);gap:30px;padding:30px}.landing-preview-body{grid-template-columns:minmax(220px,1.1fr) minmax(150px,.8fr);gap:16px;padding:14px}}@media(max-width:820px){.app-frame{grid-template-columns:92px minmax(0,1fr);min-width:0;width:100%}.side-rail{margin-left:12px;border-radius:26px;padding-inline:8px}.side-rail nav{gap:7px;margin-top:48px}.side-rail nav button,.rail-settings{min-height:64px;border-radius:19px;font-size:9px}.app-stage{padding-left:18px;padding-right:12px}.top-bar{padding-inline:16px;border-radius:24px}.landing-page{padding:16px 18px 18px}.landing-header{grid-template-columns:1fr auto}.landing-nav{display:none}.landing-hero{grid-template-columns:1fr;gap:42px;min-height:0;padding:66px 0 70px}.landing-copy h1{max-width:580px;font-size:clamp(43px,13vw,70px)}.landing-preview{max-width:650px}.landing-flow{padding-block:62px 65px}.landing-visual-flow{grid-template-columns:1fr;gap:0;margin-top:38px}.landing-flow-stage{min-height:0}.analysis-layout{grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto auto;height:auto;gap:16px}.analysis-progress{position:relative;inset:auto;grid-column:1}.board-surface{grid-column:1}.review-rail{grid-column:1;grid-row:auto}.playback-bar{grid-column:1}.settings-list>section{grid-template-columns:1fr;gap:18px;min-height:0}.settings-list{padding-inline:20px}.engine-profile-options{max-width:none}}@media(max-width:560px){.board-surface{grid-template-columns:50px minmax(0,1fr);column-gap:10px;padding:10px;border-radius:24px}.evaluation-column{gap:8px;padding-inline:6px;border-radius:16px}.evaluation-column strong,.evaluation-column small{font-size:9px}.evaluation-track{width:10px}.landing-preview-body{grid-template-columns:1fr;gap:24px;padding:14px}.landing-preview-copy{padding:0 4px 8px}.landing-preview-copy h2{max-width:320px}.landing-actions{align-items:stretch;flex-direction:column;gap:16px}.landing-primary{justify-content:center}.landing-secondary{align-self:flex-start}.account-modal{padding:22px;border-radius:25px}.account-page{padding:22px 14px}.account-modal footer{align-items:flex-start;flex-direction:column}.account-modal footer button{width:100%}.account-page{align-items:start;padding:18px 16px}.account-page-shell{padding-top:10px}.engine-profile-options{grid-template-columns:1fr}}@media(max-width:820px){.recent-surface{display:block;min-height:0;overflow:visible}.recent-header{align-items:flex-start;flex-direction:column;gap:20px;padding:24px 22px}.recent-header-actions{width:100%;align-items:center;justify-content:space-between}.recent-toolbar{align-items:flex-start;flex-direction:column;padding:14px 22px}.recent-toolbar-note{white-space:normal}.recent-game-list{overflow:visible;padding:10px 14px 22px}.recent-game-card{grid-template-columns:28px minmax(0,1fr) auto;gap:12px;min-height:0;padding:16px 10px}.recent-game-main{grid-column:2 / 4}.recent-game-meta,.recent-game-status{grid-column:2}.recent-game-action{grid-column:3;grid-row:3;align-self:end}}@media(max-width:560px){.recent-header{gap:17px;padding:20px 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