/* Longinus: consistent type, whitespace and a restrained library surface. */
:root{--ln-text:#f5f5f7;--ln-secondary:#b8b8bd;--ln-muted:#b1b1b8;--ln-border:#ffffff12;--ln-hover:#ffffff08;--ln-bg:#191919}
body{font-size:15px;line-height:1.5;text-rendering:optimizeLegibility}
button,input,select,textarea{font-family:inherit}
.browser-shell{line-height:1.4}
.browser-tab.home-tab{width:192px;min-width:192px;max-width:192px;flex-basis:192px}
.browser-tab.home-tab>[role=tab]{font-size:23px;line-height:1;padding:0 16px;gap:6px}
.browser-tab.home-tab>[role=tab]::before{width:22px;height:24px;flex-basis:22px}
.browser-tab:not(.home-tab){width:212px;flex:0 1 212px;min-width:124px;max-width:212px}
.browser-tab:not(.home-tab)>[role=tab]{font-size:12px}
.embedded #main{max-width:1200px;padding:44px 56px 64px}
.embedded[data-view=home] #main{max-width:1280px;margin:0 auto;padding:52px 64px 64px}
.collection-head{display:flex;justify-content:space-between;align-items:center;gap:32px;margin-bottom:44px}
.collection-overline{font-size:13px;font-weight:500;color:#a5a5ad;margin:0 0 10px;letter-spacing:.02em}
.collection-head h1{font-size:48px;line-height:1.12;letter-spacing:-2px;font-weight:650;margin:0}
.collection-head h1>span{color:#b77887}
.collection-description{font-size:17px;line-height:1.5;color:#a5a5ad;letter-spacing:-.4px;margin:16px 0 0}
.collection-tools{display:flex;flex-direction:column;align-items:flex-end;gap:10px}
.collection-tools .secondary{background:#f5f5f7;color:#1d1d1f;border:0;border-radius:999px;font-size:13px;min-height:38px;padding:9px 19px;font-weight:500}
.collection-tools .secondary:hover{background:#fff}
.collection-tools .quiet{font-size:12px;padding:4px 8px;min-height:30px;border-radius:999px;color:#aaaab1}
.collection-tools .quiet span{margin-left:4px}
.collection-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}
.collection-bar h2,.collection-filters>h2{font-size:20px;font-weight:600;letter-spacing:-.5px;margin:0}
.collection-bar h2>span{font-size:14px;font-weight:400;color:#ababB2;margin-left:6px}
.collection-bar p{font-size:12px;color:#b0b0b7;margin:0}.collection-bar p>span{margin:0 8px;color:#62626a}
.collection-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.collection-card{display:flex;flex-direction:column;min-height:246px;background:var(--ln-surface);border:1px solid #ffffff06;border-radius:22px;padding:26px 28px 22px;transition:background-color .2s,border-color .2s,transform .2s}
.collection-card:hover,.collection-card:focus-within{background:#2e2e30;border-color:#ffffff10;transform:translateY(-2px)}
.collection-title h3{margin:0;font-weight:500;letter-spacing:-.3px}
.collection-title h3>span{display:block;font-size:14px;line-height:1.5;color:#d5d5db;font-weight:500}
.collection-title h3>strong{display:block;font-size:48px;line-height:1.16;letter-spacing:-1.8px;font-weight:600;margin-top:6px;font-variant-numeric:tabular-nums}
.collection-title .custom-deck-title{font-size:26px;font-weight:600;line-height:1.4;overflow-wrap:anywhere}
.collection-title>p{font-size:12px;line-height:1.5;color:#b0b0b7;margin:9px 0 0}
.collection-bottom{margin-top:auto;padding-top:24px}
.collection-status{font-size:11px;line-height:1.4;color:#a6a6ae;margin:0 0 11px}
.due-dot{display:inline-block;width:5px;height:5px;border-radius:50%;background:#c995a3;margin-right:6px;vertical-align:2px}
.collection-actions{display:flex;align-items:center;justify-content:space-between;gap:10px}
.collection-start{display:flex;align-items:center;justify-content:space-between;gap:16px;border:0;background:#ededf0;color:#252528;border-radius:999px;padding:8px 14px;font-size:12px;line-height:18px;font-weight:500;min-height:34px}
.collection-start:hover{background:#fff!important}.collection-start>span{font-size:15px;font-weight:400}
.collection-browse{border:0;background:transparent;color:#bbbbc3;font-size:12px;line-height:18px;padding:8px 0;border-radius:5px;text-underline-offset:4px}
.collection-browse:hover{background:transparent!important;color:white;text-decoration:underline}
.collection-filters{margin-top:44px}.collection-filter-list{margin-top:18px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.collection-filter{display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;background:transparent;border:1px solid #ffffff12;border-radius:14px;padding:18px 20px;color:#eee;font-size:14px}.collection-filter small{color:#b1b1b8;white-space:nowrap}.collection-filter small>span{margin-left:12px}
.page-head{margin-bottom:28px}.page-head h1{font-size:32px;line-height:1.2;letter-spacing:-1px;font-weight:650}.page-head .subtitle:not(:empty){font-size:14px;color:#b1b1b8;margin-top:12px}
.primary,.secondary,.quiet{font-size:13px}.search-bar .search-input{height:46px;font-size:14px;padding:12px 16px;border-radius:12px}.search-bar select{font-size:13px;border-radius:12px}.search-bar .primary{border-radius:12px}.search-help summary{font-size:12px;padding:7px 0}.result-question{font-size:15px}.result-ref{font-size:12px}.result-meta{font-size:13px}.result-state{font-size:12px}.card-result{padding:20px 12px}.pagination{font-size:12px}
.embedded[data-view=study] #main{padding:36px 48px 158px;max-width:none}.review-wrap{max-width:900px}.review-top{font-size:13px;margin-bottom:28px}.longinus-question{font-size:18px;line-height:1.7;font-weight:600}.longinus-choice{font-size:16px;line-height:1.7;padding:8px 12px}.card-meta{font-size:12px}.review-controls{padding-top:16px;padding-bottom:14px}.review-top .quiet{font-size:12px}.explanation{font-size:16px;line-height:1.85}
dialog{border-radius:18px;padding:28px;background:var(--ln-surface)}.modal-head h2{font-size:22px}.form-field label{font-size:13px}.form-field input,.form-field textarea,.form-field select{font-size:14px;border-radius:9px}.form-field small{font-size:12px}.empty{padding:48px 0}.empty h2{font-size:25px;color:#e0e0e5;font-weight:600}.empty p{font-size:15px}
@media(min-width:1500px){.embedded[data-view=home] #main{padding-top:68px}.collection-head{margin-bottom:52px}.collection-card{min-height:270px;padding:30px}.collection-title h3>strong{font-size:54px}}
@media(max-width:1050px){.embedded[data-view=home] #main{padding:40px}.collection-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.collection-card{min-height:228px}.collection-head{margin-bottom:32px}.collection-head h1{font-size:42px}.collection-description{font-size:16px}.embedded #main{padding:36px 40px 48px}}
@media(max-width:760px){.browser-tab.home-tab{width:176px;min-width:176px;max-width:176px;flex-basis:176px}.browser-tab.home-tab>[role=tab]{font-size:22px;padding-left:12px}.browser-tab.home-tab>[role=tab]::before{width:21px;flex-basis:21px}.embedded[data-view=home] #main{padding:32px 28px 40px}.collection-head{gap:18px}.collection-head h1{font-size:38px}.collection-description{font-size:14px}.collection-grid{gap:14px}.collection-card{padding:22px;min-height:230px}.collection-title h3>strong{font-size:44px}.collection-bar h2{font-size:18px}.collection-bar p{font-size:11px}.collection-title h3>span{font-size:13px}.collection-tools .secondary{font-size:12px}.embedded #main{padding:32px 28px 48px}.page-head h1{font-size:28px}.embedded[data-view=study] #main{padding:28px 28px 150px}.collection-filter-list{grid-template-columns:1fr}}
@media(max-width:500px){.collection-head{align-items:flex-start;flex-direction:column}.collection-tools{flex-direction:row;align-items:center}.collection-grid{grid-template-columns:1fr}.collection-bar{align-items:flex-start;gap:8px;flex-direction:column}.collection-card{min-height:230px}.collection-title h3>strong{font-size:48px}.collection-head h1{font-size:40px}}
@media(prefers-reduced-motion:reduce){.collection-card{transition:none}.collection-card:hover,.collection-card:focus-within{transform:none}}

/* Dark canvas, mid-tone chrome and elevated interactive surfaces. */
:root{--ln-surface:#262627;--ln-input:#2b2b2d;--ln-strip:#202021;--ln-border:#ffffff16}
body,body.browser-shell{background:var(--ln-bg)}
*{scrollbar-color:#626266 var(--ln-bg)}
.browser-strip{background:var(--ln-strip)}
.browser-tab:has([aria-selected=true]){background:var(--ln-bg)}
.browser-tab.home-tab:not(:has([aria-selected=true])){background:var(--ln-strip)}
.browser-tab.home-tab:hover:not(:has([aria-selected=true])){background:var(--ln-surface)}
.browser-tab.home-tab:has([aria-selected=true])::after{background:radial-gradient(circle at 100% 0,transparent 12px,var(--ln-bg) 12.5px)}
.browser-tab:not(.home-tab):has([aria-selected=true])::before{background:radial-gradient(circle at 0 0,transparent 9px,var(--ln-bg) 9.5px)}
.browser-tab:not(.home-tab):has([aria-selected=true])::after{background:radial-gradient(circle at 100% 0,transparent 9px,var(--ln-bg) 9.5px)}
.app-header,body[data-view=study] .app-header,.review-top,.review-controls{background:var(--ln-bg)}
#workspace-menu,#app-menu,.tab-context{background:#2b2b2d;border-color:#ffffff20;box-shadow:0 12px 32px #0005}
.form-field input,.form-field textarea,.form-field select,.search-bar .search-input,.search-input{background:var(--ln-input);border-color:#ffffff18;color:#f3f3f5}
.search-bar select{background:var(--ln-surface);color:#dddde1}.search-bar .primary{background:#303032;border-color:#ffffff16}
.collection-card{border-color:#ffffff0a}.collection-card:hover,.collection-card:focus-within{border-color:#ffffff1c}
.collection-overline,.collection-description,.collection-tools .quiet,.collection-status,.collection-bar p,.result-ref,.result-state,.search-help summary{color:#b1b1b8}
.card-results li+li{border-color:#ffffff0d}.card-result:hover{background:#ffffff07!important}
.collection-title>p{color:#b0b0b7}.collection-browse{color:#d0d0d6}
.secondary{border-color:#ffffff20}.upload-zone{background:#ffffff03;border-color:#ffffff24}
.editor-preview,.crop-preview{background:var(--ln-bg)}.crop-stage{background:#202021}
.rating,.rating:nth-child(3){background:#ffffff06;border-color:#ffffff18;box-shadow:none}.reveal{background:#ffffff0b;border-color:#ffffff20}
::selection{background:#725461;color:#fff}
/* Inset the pinned tab, with the same top clearance as regular tabs. */
.browser-tabs{padding-left:12px;padding-right:10px;box-sizing:border-box}
.browser-tab.home-tab{left:0;height:38px;margin-right:3px;border-radius:11px 11px 0 0}
.browser-tab.home-tab>[role=tab]{height:38px;border-radius:11px 11px 0 0}
.browser-tab.home-tab:has([aria-selected=true])::before{content:'';position:absolute;left:-9px;bottom:0;width:9px;height:9px;background:radial-gradient(circle at 0 0,transparent 9px,var(--ln-bg) 9.5px);pointer-events:none}
.browser-tab.home-tab:has([aria-selected=true])::after{display:block;right:-9px;bottom:0;width:9px;height:9px;background:radial-gradient(circle at 100% 0,transparent 9px,var(--ln-bg) 9.5px);pointer-events:none}
/* Align all tab actions on the tab centre, not on the taller caption strip. */
.browser-tab>[role=tab]{display:flex;align-items:center;gap:9px;min-width:0;line-height:1;height:38px;align-self:center}
.browser-tab:not(.home-tab)>[role=tab]::before{flex:0 0 12px;margin:0;vertical-align:initial}
.tab-title{display:block;min-width:0;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.browser-tab>[role=tab]:hover{background:transparent!important}
.browser-tab .close-tab{display:flex;align-items:center;justify-content:center;flex:0 0 24px;width:24px;min-width:24px;height:24px;min-height:24px;margin:0 7px 0 0;padding:0;border:0;border-radius:50%;line-height:1;align-self:center;color:#bdbdc4;transform:none}
.browser-strip .new-tab{display:flex;align-items:center;justify-content:center;flex:0 0 28px;width:28px;min-width:28px;height:28px;min-height:28px;align-self:flex-end;margin:0 8px 5px;padding:0;border:0;border-radius:50%;line-height:1;color:#c6c6cc;transform:none}
.browser-tab .close-tab svg,.browser-strip .new-tab svg{display:block;width:16px;height:16px;flex:none;pointer-events:none}
.browser-tab .close-tab:hover,.browser-strip .new-tab:hover{background:#ffffff14;filter:none}
.browser-tab .close-tab:active,.browser-strip .new-tab:active{background:#ffffff20;transform:none}
.browser-tab.tab-closing{overflow:hidden;pointer-events:none;flex-shrink:0;border-width:0;padding:0}
.browser-tab.tab-closing::before,.browser-tab.tab-closing::after{display:none!important}
.deck-progress{margin-bottom:18px}.progress-caption{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:9px;color:var(--ln-secondary);font-size:12px}.progress-caption strong{font-size:17px;font-weight:550;color:var(--ln-text);font-variant-numeric:tabular-nums}.deck-progress progress{display:block;width:100%;height:3px;border:0;border-radius:4px;overflow:hidden;background:#ffffff10;appearance:none}.deck-progress progress::-webkit-progress-bar{background:#ffffff10;border-radius:4px}.deck-progress progress::-webkit-progress-value{background:#b77887;border-radius:4px}.deck-progress progress::-moz-progress-bar{background:#b77887;border-radius:4px}.collection-bar>.deck-progress{width:160px;margin:0}.collection-bar>.deck-progress .progress-caption{margin-bottom:6px}.collection-bar>.deck-progress .progress-caption>span::before{content:'전체 '}

/* Invisible resize grips sit above WebView content, including embedded tabs. */
.window-resize-grip{position:fixed;z-index:100000;user-select:none;touch-action:none}
.window-maximized .window-resize-grip{display:none}
.grip-n,.grip-s{left:16px;right:16px;height:8px;cursor:ns-resize}
.grip-n{top:0}.grip-s{bottom:0}
.grip-w,.grip-e{top:16px;bottom:16px;width:8px;cursor:ew-resize}
.grip-w{left:0}.grip-e{right:0}
.grip-nw,.grip-ne,.grip-sw,.grip-se{width:16px;height:16px}
.grip-nw{top:0;left:0;cursor:nwse-resize}.grip-ne{top:0;right:0;cursor:nesw-resize}
.grip-sw{bottom:0;left:0;cursor:nesw-resize}.grip-se{bottom:0;right:0;cursor:nwse-resize}

.textbook-library{margin-top:64px;padding-top:36px;border-top:1px solid var(--ln-border)}
.textbook-empty{min-height:200px;border-radius:22px;background:var(--ln-surface);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:32px 20px;color:var(--ln-secondary)}
.textbook-empty svg{color:#b77887;margin-bottom:14px}.textbook-empty p{margin:0 0 6px;font-size:15px;color:var(--ln-text)}.textbook-empty>span{font-size:13px}


.library-grouping{position:relative;display:flex;gap:0;border-bottom:1px solid var(--ln-border);margin:0 0 24px;padding:0;background:none;border-radius:0;width:100%}
.library-grouping::after{content:'';position:absolute;bottom:-1px;left:0;width:84px;height:2px;background:#b77887;border-radius:2px;transform:translateX(0);transition:transform 180ms ease}
.library-grouping[data-selected="subject"]::after{transform:translateX(84px)}
.library-grouping button{width:84px;flex:0 0 84px;margin:0;border:0;border-radius:0;box-shadow:none;background:transparent;color:var(--ln-secondary);padding:11px 0 13px;font-size:13px;cursor:pointer;transition:color 150ms ease}
.library-grouping button[aria-pressed="true"]{background:transparent;color:var(--ln-text);font-weight:600;box-shadow:none}
.library-grouping button:hover{color:var(--ln-text)}
.collection-grid[hidden]{display:none}
.subject-card .custom-deck-title{font-size:24px}
@media(prefers-reduced-motion:reduce){.library-grouping::after,.library-grouping button{transition:none}}

/* Compact caption: 40px strip, 34px tabs and a 6px top inset. */
.browser-strip,.browser-tabs{height:40px}
.browser-tab.home-tab,.browser-tab:not(.home-tab),.browser-tab>[role=tab],.browser-tab.home-tab>[role=tab]{height:34px}
.browser-strip .new-tab{margin-bottom:3px}
.workspace-menu-wrap,.native-window .workspace-menu-wrap{align-self:flex-end;margin-bottom:2px}
.native-window .window-controls,.native-window .window-controls button{height:40px;min-height:40px}
.tab-pane{height:calc(100vh - 40px)}
.browser-tab:not(.home-tab)::after{top:8px;height:18px}
.browser-tab:not(.home-tab):has([aria-selected=true])::after{top:auto;height:9px}
/* Centre the menu dots independently of font baselines. */
#workspace-menu-toggle{display:flex;align-items:center;justify-content:center;line-height:1;padding:0}
#workspace-menu-toggle svg{display:block;flex:none;pointer-events:none}
.workspace-menu-wrap,.native-window .workspace-menu-wrap{align-self:center;margin-bottom:0}
.browser-tab:not(.home-tab)>[role=tab]::before{display:none}
/* Embedded workspaces must never paint the legacy header during module startup. */
.app-header{display:none!important}
body.app-booting{background:#191919}
.app-booting #main{opacity:0;pointer-events:none}
.app-ready #main{animation:workspace-reveal 160ms ease-out both}
@keyframes workspace-reveal{from{opacity:0}to{opacity:1}}
@media(prefers-reduced-motion:reduce){.app-ready #main{animation:none}}

/* The navigation row takes its own space; embedded page padding stays intact. */
.browser-shell{display:flex;flex-direction:column;height:100vh}
.browser-shell>.browser-strip{flex-shrink:0}
.workspace-navigation{height:44px;flex:0 0 44px;box-sizing:border-box;display:flex;align-items:center;justify-content:space-between;padding:0 18px;background:#191919;border-bottom:1px solid #ffffff0d}
.navigation-arrows{display:flex;gap:4px}
.workspace-navigation button{display:flex;align-items:center;justify-content:center;border:0;background:transparent;color:#b8b8bd;border-radius:8px;height:32px;cursor:pointer}
.navigation-arrows button{width:34px;padding:7px}
.workspace-navigation svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.workspace-navigation button:hover:not(:disabled){background:#ffffff0c;color:#f5f5f7}
.workspace-navigation button:disabled{opacity:.28;cursor:default}
.login-wrap{position:relative}#login-toggle{gap:9px;padding:0 8px;font:inherit}#login-toggle svg{width:23px;height:23px}
#login-popover{position:absolute;right:0;top:40px;width:210px;padding:18px;border:1px solid #ffffff18;background:#272727;border-radius:12px;z-index:250;box-shadow:0 12px 30px #0005;color:#ccc}
.browser-shell>#tab-panes{flex:1;min-height:0}.browser-shell .tab-pane{height:100%}
.wiki-link-menu{position:fixed;z-index:1000;width:194px;padding:5px;border:1px solid #ffffff20;border-radius:9px;background:#292929;box-shadow:0 10px 30px #0006}
.wiki-link-menu button{width:100%;padding:10px;border:0;border-radius:5px;background:transparent;color:#eee;text-align:left;cursor:pointer}.wiki-link-menu button:hover{background:#ffffff10}
/* Two existing workspaces share one window without reloading their frames. */
#split-view-toggle{flex:0 0 34px;width:34px;height:30px;align-self:center;padding:5px;background:transparent;color:#aaa3a8;border:0;border-radius:6px;cursor:pointer;margin-left:auto}
#split-view-toggle svg{fill:none;stroke:currentColor;stroke-width:1.5}
#split-view-toggle:hover,#split-view-toggle[aria-pressed=true]{background:#b88d9f20;color:#d5b5c3}
.browser-strip .workspace-menu-wrap,.native-window .browser-strip .workspace-menu-wrap{margin-left:8px;padding-left:0}
#tab-panes{position:relative;overflow:hidden}
.split-pane-bar,.split-divider{display:none}
#tab-panes.is-split>.tab-pane{position:absolute;top:36px;bottom:0;height:auto;width:calc(var(--split-left) - 3px);left:0;min-width:0;box-sizing:border-box}
#tab-panes.is-split>.tab-pane[data-split-side="1"]{left:calc(var(--split-left) + 3px);right:0;width:auto}
#tab-panes.is-split>.split-pane-bar{position:absolute;display:flex;gap:10px;align-items:center;top:0;left:0;width:calc(var(--split-left) - 3px);height:36px;padding:0 12px;box-sizing:border-box;background:#202022;border-bottom:1px solid #ffffff10;color:#8f898e;font-size:11px}
#tab-panes.is-split>.split-pane-bar[data-side="1"]{left:calc(var(--split-left) + 3px);right:0;width:auto}
.split-pane-bar select{font:12px 'Longinus Pretendard',sans-serif;color:#c4bec2;min-width:0;flex:1;background:transparent;border:0;padding:4px;outline-offset:0}
.split-pane-bar select option{background:#242224}
#tab-panes.is-split>.split-pane-bar.split-focused{border-bottom-color:#a77c8f;color:#cdb6c1}
#tab-panes.is-split>.split-divider{display:block;position:absolute;top:0;bottom:0;left:calc(var(--split-left) - 3px);width:6px;background:#302b2f;cursor:col-resize;touch-action:none;z-index:5}
.split-divider:hover,.split-divider:focus-visible{background:#947583!important;outline:0}
.split-resizing iframe{pointer-events:none}
/* Each split has its own tab strip, aligned with its content pane. */
.split-tabs .browser-strip{position:relative}
.split-tabs .browser-tabs{position:absolute!important;top:0;left:0;max-width:none!important;min-width:0!important;width:calc(var(--split-left) - 40px);height:100%;margin:0;box-sizing:border-box}
.split-tabs #tab-list-right{left:var(--split-left);width:calc(100% - var(--split-left) - 120px);border-left:1px solid #44373f}
.split-tabs.native-window #tab-list-right{width:calc(100% - var(--split-left) - 258px)}
.split-tabs .browser-strip>.new-tab:not(.split-new-tab){position:absolute;left:calc(var(--split-left) - 38px);margin:0}
.split-tabs .split-new-tab{position:absolute;right:82px;margin:0}
.split-tabs.native-window .split-new-tab{right:220px}
#tab-list-right[hidden],.split-new-tab[hidden]{display:none!important}
.split-tabs .browser-tab.split-visible{background:#191919}
#tab-panes.is-split>.tab-pane{top:0}
/* Split mode changes placement only; both groups share the original tab UI. */
.split-tabs .browser-strip>.new-tab{right:auto;top:9px;margin:0}
.split-tabs .browser-tab.split-visible{background:var(--ln-bg)}