/* SEKVAR: presentation concept for Cheatix Second. No external font requests. */
:root{color-scheme:dark;--bg:#171b19;--panel:#202621;--panel2:#2b332c;--line:#414940;--text:#f2ede2;--muted:#b4b7ac;--accent:#c8a476;--error:#f0a497;--success:#b7ceae;--radius:3px;--serif:'Source Serif 4',Georgia,serif;--mono:'IBM Plex Mono',monospace;font:15px/1.55 'IBM Plex Sans',sans-serif}
:root[data-theme=light]{color-scheme:light;--bg:#f2ede2;--panel:#faf7f0;--panel2:#e4dfd2;--line:#b9baad;--text:#171b19;--muted:#555e54;--accent:#705030;--error:#9c3329;--success:#365a31}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}[hidden]{display:none!important}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{outline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:2px solid var(--accent)}button,.button-link{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:3px;padding:8px 16px;cursor:pointer;text-decoration:none;transition:background .1s,border-color .1s;line-height:1.4}button:hover,.button-link:hover{background:var(--panel2);border-color:var(--muted)}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:var(--accent);border-color:var(--accent);color:var(--bg);font-weight:600}.primary:hover{background:var(--accent);border-color:var(--text)}a{color:var(--accent);text-underline-offset:3px}button.active,button[aria-pressed=true]{border-color:var(--accent);color:var(--accent)}input,select,textarea{width:100%;min-width:0;background:var(--bg);border:1px solid var(--muted);color:var(--text);padding:10px 12px;border-radius:3px;min-height:44px}input[type=checkbox],input[type=radio]{width:20px;min-height:20px;flex-shrink:0;accent-color:var(--accent)}input[type=file]{font-size:14px}label{display:flex;flex-direction:column;gap:8px;font-size:14px;color:var(--text)}small,.muted{color:var(--muted)}small{font-size:13px}p{margin:8px 0 16px}h1,h2,h3{font-weight:400;color:var(--text);margin:0 0 16px}h1,h2{font-family:var(--serif)}h1{font-size:34px;line-height:1.15;letter-spacing:-.6px}h2{font-size:24px;line-height:1.25}h3{font-size:20px;line-height:1.4}summary{cursor:pointer;min-height:36px;padding:8px 0;font-size:14px;color:var(--muted)}details[open]>summary{color:var(--text)}pre,code,output{font-family:var(--mono);font-size:13px;overflow-wrap:anywhere}.eyebrow{font:600 12px/1.5 'IBM Plex Sans',sans-serif;letter-spacing:1.2px;text-transform:uppercase;color:var(--accent);margin:0 0 8px}.skip-link{position:fixed;left:16px;top:-100px;background:var(--accent);color:var(--bg);padding:16px;z-index:100}.skip-link:focus{top:8px}
.sidebar{position:fixed;inset:0 auto 0 0;width:192px;padding:24px 16px;display:flex;flex-direction:column;border-right:1px solid var(--line);background:var(--bg);z-index:10}.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;font-size:22px;letter-spacing:2px;font-weight:600;margin:0 0 40px}.brand-mark{width:28px;height:28px;flex-shrink:0;color:var(--accent)}.brand small{display:block;font-size:12px;line-height:1.5;letter-spacing:.1px;font-weight:400}.sidebar nav{display:grid;gap:8px}.nav-item{display:flex;width:100%;justify-content:flex-start;border:0;background:transparent;text-align:left;padding:12px 8px;font-size:14px;color:var(--muted)}.nav-item.active{background:var(--panel);color:var(--text);box-shadow:inset 2px 0 var(--accent)}.sidebar-case{display:none}.local-note{margin-top:auto;padding-top:24px;color:var(--muted);font-size:12px;line-height:1.65}.local-note p{font-size:13px;margin:8px 0}.local-note form{display:none}.local-dot{display:inline-block;width:6px;height:6px;background:var(--success);margin:0 8px 1px 0}main{margin-left:192px;padding:0 32px;max-width:1680px;min-width:0}.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted);gap:16px}.topbar span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.top-label{font-size:12px;letter-spacing:.5px}.topbar button{min-height:36px;font-size:13px;background:transparent}.page-heading{padding:32px 0 24px;display:flex;justify-content:space-between;align-items:center;gap:24px}.page-heading h1{margin-bottom:8px}.page-heading p:last-child{margin:0}.page-heading.compact{padding:24px 0 16px}.compact h1{font-size:30px}.badges{display:flex;gap:8px;flex-wrap:wrap;align-items:center;max-width:320px}.badge{display:inline-block;font-size:12px;line-height:1.5;color:var(--muted);border:1px solid var(--line);padding:4px 8px;border-radius:2px}.badge.amber{color:var(--accent)}.badge.green{color:var(--success)}.library-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px;color:var(--muted);font-size:13px}.check-label,.master-options label{flex-direction:row;align-items:center;gap:8px;font-size:14px}.case-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:0}.case-card{grid-column:span 12;border-top:1px solid var(--line);padding:24px 0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 24px}.case-card h2{font-size:24px;margin:0}.case-card .versus{grid-column:1;font-size:16px}.case-card .badges{grid-column:2;grid-row:1/3;justify-content:flex-end}.case-card .eyebrow{display:none}.case-card .card-meta{display:flex;gap:16px;color:var(--muted);font-size:13px;grid-column:1}.case-card>button{grid-column:2;grid-row:3;background:transparent}.empty-panel{padding:32px 0;border-top:1px solid var(--line);max-width:720px}.empty-panel p{color:var(--muted)}.form-panel{max-width:1040px;padding:24px 0}.form-section{margin:0 0 32px;padding:0 0 24px;border-bottom:1px solid var(--line)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.form-grid>div{min-width:0}.form-footer{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0}.form-footer p{max-width:440px;margin:0}.master-options{display:flex;gap:16px;flex-wrap:wrap;margin:16px 0}.advanced{margin:24px 0}.advanced .form-grid{margin:16px 0}.upload-label{padding:16px;border:1px dashed var(--line)}.case-tabs{display:flex;gap:0;border-bottom:1px solid var(--line);margin:0 0 24px;max-width:100%;flex-wrap:wrap}.case-tabs button{background:transparent;border:0;border-bottom:2px solid transparent;border-radius:0;padding:12px;font-size:14px}.case-tabs button.active{border-bottom-color:var(--accent)}.case-tabs #feedback-open{margin-left:auto;color:var(--muted)}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:24px 0 16px}.section-heading h2{margin:0}.sample-strip{display:flex;gap:32px;flex-wrap:wrap;margin:24px 0}.sample-cell{border-left:2px solid var(--line);padding:0 16px;font-size:13px;color:var(--muted)}.sample-cell strong{display:block;font:400 30px var(--serif);color:var(--text)}.direction-grid{display:block}.direction-card{border-top:1px solid var(--line);padding:24px 16px;margin:0}.direction-card.selected{border-left:2px solid var(--accent);background:var(--panel)}.direction-card .route{font:400 16px/1.8 var(--mono);margin:16px 0}.direction-card p,.direction-card ul{font-size:14px}.direction-card .counts,.direction-card ul{color:var(--muted)}.direction-card a{overflow-wrap:anywhere}.approval-panel,.evidence-panel{border-left:2px solid var(--accent);background:var(--panel);padding:24px;margin:24px 0}.approval-panel{display:grid;grid-template-columns:1fr 1fr;gap:32px}.approval-panel form{display:grid;gap:16px}.pipeline-actions{display:flex;align-items:end;gap:16px;flex-wrap:wrap;margin:24px 0}.pipeline-actions label{max-width:340px}.limitations{border-top:1px solid var(--line);margin:24px 0;padding:8px 0}.limitations li{font-size:14px;color:var(--muted);margin:8px 0}.workspace-toolbar{display:flex;align-items:center;justify-content:flex-start;gap:8px;flex-wrap:wrap;margin:0 0 16px}.workspace-toolbar>button{margin-left:auto}.segmented{display:flex;gap:0;flex-wrap:wrap}.segmented button{border-radius:0;font-size:14px}.segmented button+button{margin-left:-1px}.workspace-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:24px;align-items:start}.board-column{min-width:0;width:100%;position:sticky;top:16px}.board-caption{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:13px;margin:0 0 8px}.board-caption span:first-child{color:var(--text)}#prep-board,#study-board{position:relative;width:100%;overflow:hidden;border:0;box-shadow:none;border-radius:0}#prep-board .white-1e1d7,#study-board .white-1e1d7{background:#e7d8bb;color:#171b19}#prep-board .black-3c85d,#study-board .black-3c85d{background:#876449;color:#fffdf6}#prep-board .last-square,#study-board .selected-square{box-shadow:inset 0 0 0 4px #d5bd52}#prep-board .checked-square,#study-board .check-square{box-shadow:inset 0 0 0 5px #ae2e27}#study-board .active-source{box-shadow:inset 0 0 0 5px #2c602c}#prep-board img,#study-board img{user-select:none}#study-board .legal-destination::after{content:'';position:absolute;width:24%;height:24%;left:38%;top:38%;border-radius:50%;background:#233d2c;pointer-events:none}#study-board .legal-capture::after{content:'';position:absolute;inset:4%;border:5px solid #233d2c;border-radius:50%;pointer-events:none}#study-board .board-marks{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:3}#study-board .fallback-board{display:grid;grid-template-columns:repeat(8,1fr);aspect-ratio:1}#study-board .fallback-square{position:relative;background:#e7d8bb;display:grid;place-items:center}#study-board .fallback-square.dark{background:#876449}#study-board .fallback-square img{width:90%}.board-controls{display:flex;justify-content:space-between;gap:8px;margin:8px 0;flex-wrap:wrap}.board-controls>div{display:flex;gap:4px}.board-controls button{padding:8px 12px}.fen-details{color:var(--muted);font-size:13px}.fen-details output{display:block;padding:16px;background:var(--panel)}.evaluation-panel{font-size:13px;color:var(--muted);padding:16px 0}.evaluation-panel strong{font:400 22px var(--mono);color:var(--accent);margin-right:8px}.notation-column{min-width:0;border-top:1px solid var(--line)}.notation-heading{padding:16px 0;border-bottom:1px solid var(--line)}.notation-heading label{display:flex;flex-direction:column;gap:8px}.notation-heading .eyebrow{margin-bottom:8px}.move-tree{height:clamp(240px,32vh,360px);overflow:auto;padding:16px 0;line-height:2;scrollbar-color:var(--line) transparent;overflow-anchor:none;overscroll-behavior:contain}.move{min-height:32px;min-width:32px;padding:4px 6px;border:0;background:transparent;font:400 14px/1.7 var(--mono);border-radius:2px;margin:2px;color:var(--text)}.move.current,.move.current.on-path{background:var(--accent);color:var(--bg);font-weight:600}.move.on-path{color:var(--accent)}.branch{margin:8px 0 8px 8px;padding-left:8px;border-left:2px solid var(--line)}.branch summary{font-size:13px;line-height:1.6}.branch-line{padding:0}.position-notes{padding:16px 0;border-top:1px solid var(--line);min-height:180px;max-height:360px;overflow:auto;overscroll-behavior:contain}.position-notes h3{font-family:var(--mono);font-size:16px;margin:8px 0}.position-notes .eyebrow{font-size:12px}#position-comment,#starting-comment{font-size:15px;line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere}#starting-comment{color:var(--muted)}.study-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:24px 0}.study-toolbar select{max-width:420px}.human-warning{color:var(--accent);border-left:2px solid var(--accent);padding:8px 16px;margin:16px 0;font-size:13px}.human-warning p{margin:8px 0}.demo-notice{margin:8px 0;padding:0 16px}.demo-notice summary{font-size:13px;color:var(--accent)}.study-content{max-width:960px;padding:24px 0;overflow-wrap:anywhere}.study-content p{white-space:pre-wrap;font-size:15px;line-height:1.8}.job-panel{border-left:3px solid var(--accent);background:var(--panel);padding:16px 24px;margin:16px 0}.job-panel .section-heading{margin:0 0 8px}.job-panel h2{font-size:24px}.job-panel pre{white-space:pre-wrap;max-height:160px;overflow:auto;color:var(--muted)}.error-text{color:var(--error);font-size:14px}.error-text:empty{display:none}#notice,.auth-message{border-left:3px solid var(--accent);background:var(--panel);color:var(--text);padding:16px;margin:16px 0;overflow-wrap:anywhere}footer{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:16px 0;margin:32px 0 0;font-size:12px;color:var(--muted)}.intersection-row{border-top:1px solid var(--line);padding:16px 0;overflow-wrap:anywhere}.intersection-row p,#first-move-observations{font-size:14px;color:var(--muted)}.discovery-mode{display:flex;gap:24px;flex-wrap:wrap;margin-bottom:24px}.player-results{max-height:240px;overflow:auto}.player-result{display:block;width:100%;text-align:left;margin:8px 0;font-size:14px}.confirmed-profile:not(:empty){padding:16px;border-left:2px solid var(--success);background:var(--panel);margin-top:8px}.confirmed-profile p{font-size:14px;margin:8px 0 0}.discovery-counts,.discovery-provider-summary{display:grid;grid-template-columns:1fr 1fr;gap:16px}.discovery-count-card,.discovery-provider{min-width:0;border-top:1px solid var(--line);padding:16px 0}.discovery-count-card p,.discovery-provider p{font-size:14px;margin:8px 0;overflow-wrap:anywhere}.discovery-provider h3{font-size:20px}.discovery-provider strong{font-size:14px;color:var(--accent)}.discovery-warnings{font-size:14px;color:var(--accent);padding-left:24px}#discovery-result{border-top:1px solid var(--line);margin-top:24px;padding-top:16px}#discovery-games,#discovery-sources{max-height:440px;overflow:auto}.acquired-game{border-top:1px solid var(--line);padding:16px 0}.acquired-game p,#discovery-sources p{font-size:13px;overflow-wrap:anywhere}.acquired-game label{align-items:flex-start}#discovery-continue{margin-bottom:24px}.study-mode-bar{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;margin:16px 0}.study-mode-bar>div{display:flex;gap:8px;flex-wrap:wrap}.study-idea{padding:8px 0;margin:0}.study-idea p{font-size:14px;line-height:1.65}.study-context:has(#study-idea[hidden]){display:none}.study-context,.source-details{border-bottom:1px solid var(--line);margin-bottom:16px}.activity-toolbar{display:flex;align-items:end;gap:16px;margin:16px 0}.activity-toolbar label{flex:1;min-width:0}.study-decision-panel{min-width:0;padding:0}.study-decision-panel h3{font-size:22px}.study-decision-panel p{font-size:14px;line-height:1.7}.study-feedback{border-left:3px solid var(--accent);padding-left:16px;margin:16px 0}.study-feedback:empty{display:none}.study-feedback p{margin:8px 0}.study-actions{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.study-current-notes{padding-top:16px;border-top:1px solid var(--line);margin-top:16px}.study-current-notes>div{font-size:15px;line-height:1.7;white-space:pre-wrap;max-height:280px;overflow:auto}.study-progress{margin:24px 0;border-top:1px solid var(--line);padding:16px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}.study-progress p,#study-source-notes{font-size:13px;color:var(--muted)}#study-history{max-height:160px;overflow:auto;overscroll-behavior:contain}.mobile-pane-tabs{display:none}dialog{background:var(--bg);color:var(--text);border:1px solid var(--line);border-radius:3px;max-width:min(92vw,560px);max-height:90dvh;overflow:auto;padding:24px}dialog::backdrop{background:#0009}#feedback-form{display:grid;gap:16px}#feedback-form textarea{min-height:112px;resize:vertical}.login-page main{margin:0;max-width:1120px;min-height:100dvh;display:grid;grid-template-columns:7fr 5fr;gap:80px;align-items:center;padding:48px;margin-inline:auto}.wordmark{font-size:30px;letter-spacing:4px;font-weight:600;margin:0 0 64px}.wordmark span{display:block;font-size:12px;font-weight:400;letter-spacing:.5px;color:var(--muted)}.login-intro h1{font-size:36px;line-height:1.2}.login-intro>p:not(.eyebrow):not(.wordmark){color:var(--muted);max-width:380px}.login-boundary{margin-top:48px;font-size:13px}.login-form{border-left:1px solid var(--line);padding-left:48px}.login-form form{display:grid;gap:16px}.login-form h2{font-size:30px}.invitation-form{border-top:1px solid var(--line);margin-top:24px;padding-top:8px}.login-form>p:last-child{font-size:13px;margin-top:24px}
@media(min-width:1600px){.workspace-grid{max-width:1300px}.board-column{max-width:680px}}
@media(max-width:1100px){.sidebar{width:168px;padding:24px 12px}main{margin-left:168px;padding:0 24px}.brand{font-size:19px;gap:8px}.brand small{font-size:12px}.top-label{display:none}.workspace-grid{grid-template-columns:minmax(0,6fr) minmax(0,6fr);gap:16px}.badges{max-width:240px}.workspace-toolbar>button{margin-left:0}.approval-panel{gap:24px}}
@media(max-width:850px){.sidebar{position:static;width:auto;display:flex;flex-direction:row;align-items:center;gap:16px;padding:16px;border-right:0;border-bottom:1px solid var(--line)}.brand{margin:0;font-size:20px}.brand small{font-size:12px}.sidebar nav{display:flex;gap:0;margin-left:auto;flex-wrap:wrap}.sidebar .nav-item{width:auto;padding:8px;font-size:13px}.local-note{display:none}main{margin:0;padding:0 16px}.topbar{height:48px}.compact h1{font-size:28px}.page-heading{padding:24px 0}.page-heading.compact{align-items:flex-start}.badges{max-width:200px}.case-tabs #feedback-open{margin-left:0}.login-page main{gap:32px;padding:32px}.login-form{padding-left:32px}}
@media(max-width:650px){.sidebar{flex-wrap:wrap;gap:8px}.sidebar nav{flex-basis:100%;margin:0;justify-content:space-between}.sidebar .nav-item{min-height:44px;padding:8px;font-size:13px}.page-heading{align-items:flex-start;flex-direction:column;gap:16px}h1,.compact h1{font-size:30px;overflow-wrap:anywhere}.page-heading .badges{max-width:none}.form-grid,.approval-panel,.discovery-counts,.discovery-provider-summary{grid-template-columns:1fr}.form-footer,.library-toolbar{align-items:flex-start;flex-direction:column;gap:16px}.case-tabs{display:grid;grid-template-columns:1fr 1fr;margin-bottom:16px}.case-tabs button{padding:8px;font-size:14px}.case-tabs #feedback-open{grid-column:span 2;min-height:36px;font-size:13px;text-align:left;justify-content:flex-start}.workspace-toolbar{gap:8px}.workspace-toolbar .segmented{flex-basis:100%}.workspace-toolbar .segmented button{flex:1;min-width:0;padding:8px;font-size:13px}.workspace-toolbar>button,.workspace-toolbar>a{flex:1;font-size:13px;padding:8px}.workspace-grid{grid-template-columns:minmax(0,1fr);gap:16px}.board-column{position:static;max-width:520px;margin:auto}.board-caption{font-size:13px}.board-controls button{padding:8px 10px;font-size:13px}.notation-column{width:100%}.mobile-pane-tabs{display:flex;margin:16px 0;gap:0}.mobile-pane-tabs button{flex:1;border-radius:0}.mobile-pane-tabs button[aria-pressed=true]{background:var(--panel2)}#workspace-view:not([data-mobile-pane=notes]) .notation-column,#workspace-view[data-mobile-pane=notes] .board-column,#study-view:not([data-mobile-pane=notes]) .study-decision-panel,#study-view[data-mobile-pane=notes] .board-column{display:none}.move-tree{height:300px}.position-notes{max-height:none}.activity-toolbar{flex-wrap:wrap}.activity-toolbar label{flex-basis:100%}.study-progress{align-items:flex-start;flex-direction:column}.study-mode-bar>div{width:100%;gap:0}.study-mode-bar .segmented button{flex:1;font-size:13px;padding:8px}.study-toolbar{flex-wrap:wrap}.case-card{grid-template-columns:1fr;gap:8px}.case-card .badges,.case-card>button{grid-column:1;grid-row:auto;justify-content:flex-start}.case-card>button{margin-top:8px}.case-card .card-meta{flex-wrap:wrap}.human-warning{font-size:13px}.job-panel{padding:16px}footer{flex-direction:column}.login-page main{display:block;padding:24px;min-height:100dvh}.login-intro .wordmark{margin-bottom:24px}.login-intro h1{font-size:30px}.login-intro h1 br{display:none}.login-intro>p:not(.wordmark){display:none}.login-form{border:0;padding:24px 0 0}.login-form h2{font-size:24px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

.nav-label-compact,.case-title-short,.mobile-step{display:none}.language-note{margin:0 0 16px}.language-note summary{font-size:13px}#case-feedback{margin:24px 0;padding:16px 0;border-top:1px solid var(--line);display:flex;align-items:center;gap:16px}#case-feedback p{font-size:13px;margin:0}
@media(max-width:650px){.nav-label-wide,.case-title-long{display:none}.nav-label-compact,.case-title-short{display:inline}.sidebar .nav-item{font-size:13px;padding:8px 6px}.sidebar{padding:12px 16px}.sidebar nav{flex-wrap:nowrap}.page-heading.compact{padding:16px 0;gap:8px}.page-heading.compact .badges{display:none}.page-heading.compact .eyebrow{display:none}.page-heading.compact h1{margin-bottom:8px}.case-tabs{display:none}.mobile-step{display:flex;margin:0 0 16px;gap:4px}.demo-notice{padding:0 12px}.demo-notice summary{font-size:13px}.language-note{margin-bottom:8px}.activity-toolbar{flex-wrap:nowrap;gap:8px}.activity-toolbar label{flex-basis:auto;font-size:13px}.activity-toolbar button{padding:8px 12px}.study-mode-bar{margin:8px 0}.study-mode-bar .segmented{width:100%}.study-mode-bar .segmented button{min-width:0}.study-grid{margin-top:8px}#study-view>.section-heading{margin:16px 0}.section-heading .eyebrow{display:none}#case-feedback{flex-direction:column;align-items:flex-start}}

.mobile-menu-toggle{display:none}@media(max-width:650px){.sidebar{align-items:center;justify-content:space-between}.mobile-menu-toggle{display:inline-flex;margin-left:auto;font-size:14px}.sidebar nav,.topbar{display:none}.sidebar[data-menu-open=true] nav{display:flex;flex-basis:100%;flex-wrap:wrap}.sidebar[data-menu-open=true] .local-note{display:block;flex-basis:100%;margin:0;padding:8px 0}.sidebar[data-menu-open=true] .local-note form{display:block}.mobile-pane-tabs button{font-size:14px}.mobile-pane-tabs{margin:12px 0}.page-heading.compact{padding:12px 0}.activity-toolbar{margin:12px 0}}
/* Touch gestures belong to the chessboard; scrolling remains available outside it. */
#study-board{touch-action:none;overscroll-behavior:contain}
#study-board img{-webkit-user-drag:none}

/* Authentication uses the existing SEKVAR palette and local typefaces. */
.auth-page{margin:0}
.auth-page .auth-shell{box-sizing:border-box;width:100%;max-width:440px;min-height:100dvh;margin:0 auto;padding:64px 24px 40px;display:flex;flex-direction:column;justify-content:center}
.auth-brand{margin-bottom:32px}
.auth-brand h1{font:600 28px/1.2 'IBM Plex Sans',sans-serif;letter-spacing:4px;margin:0 0 8px}
.auth-brand p{color:var(--muted);margin:0}
.auth-nav{display:flex;border-bottom:1px solid var(--line);gap:24px;margin-bottom:28px}
.auth-nav a{display:block;padding:12px 0;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent;min-height:44px;box-sizing:border-box}
.auth-nav a[aria-current=page]{color:var(--text);border-bottom-color:var(--accent)}
.auth-panel h2{font:500 22px/1.3 'IBM Plex Sans',sans-serif;margin:0 0 24px}
.auth-panel form{display:grid;gap:18px}
.auth-panel input{box-sizing:border-box;width:100%;min-width:0;font-size:16px}
.auth-panel form small{color:var(--muted);font-size:12px;margin-top:-12px}
.auth-panel .primary{min-height:48px;width:100%;margin-top:6px}
.auth-panel .auth-hint{color:var(--muted);font-size:14px;margin:-12px 0 24px}
.auth-panel .auth-message{color:var(--error);border-left:2px solid var(--accent);padding:8px 12px;margin:0 0 24px;overflow-wrap:anywhere}
.auth-panel .auth-message.auth-success{color:var(--success);border-left-color:var(--success)}
@media(max-width:650px){.auth-page .auth-shell{padding:32px 24px;justify-content:flex-start}.auth-brand{margin-bottom:24px}}
