:root{--bg:#f2f3f5;--paper:#fff;--ink:#17191e;--sub:#545a65;--faint:#7a808a;--line:#e2e4e8;--line-strong:#ccd0d7;--blue:#2257d6;--blue-dark:#1a45ad;--blue-soft:#eef3fd;--red:#c9342b;--red-soft:#fdeceb;--stage:#0e131b;--radius:12px;--font:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Pretendard","Noto Sans KR","Malgun Gothic",system-ui,sans-serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html.lock,html.lock body{overflow:hidden}
body{margin:0;overflow-x:clip;background:var(--bg);color:var(--ink);font:16px/1.6 var(--font);word-break:keep-all;overflow-wrap:break-word;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-underline-offset:3px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:0;border-radius:8px;background:none}
button:disabled{cursor:default;opacity:.4}
:focus-visible{outline:3px solid rgba(34,87,214,.45);outline-offset:2px}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;z-index:60;background:var(--ink);color:#fff;padding:8px 14px;border-radius:8px;text-decoration:none}
.skip:focus{top:12px}
.wrap{width:min(1840px,100% - 40px);margin-inline:auto}
svg{width:20px;height:20px;flex:none}

.top{background:var(--paper);border-bottom:1px solid var(--line)}
.top-row{display:flex;align-items:center;gap:10px;height:60px}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);text-decoration:none;font-size:18px;font-weight:800;letter-spacing:-.3px}
.brand img{display:block;border-radius:8px}
.badge{font-size:11px;font-weight:700;color:var(--blue);background:var(--blue-soft);border-radius:999px;padding:3px 9px}
.home-link{margin-left:auto;font-size:14px;font-weight:600;color:var(--sub);text-decoration:none;padding:6px 12px;border-radius:999px}
.home-link:hover{background:var(--bg);color:var(--ink)}

.intro{padding:34px 0 22px}
.intro h1,.intro p{max-width:760px}
.intro h1{font-size:clamp(25px,4vw,34px);line-height:1.3;letter-spacing:-.8px;margin:0 0 10px}
.intro p{margin:0;color:var(--sub)}
.perks{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:16px 0 0}
.perks li{font-size:13px;font-weight:600;color:var(--sub);background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:4px 11px}

.workspace{width:min(1840px,100% - 40px);margin-inline:auto;display:grid;grid-template-columns:320px minmax(0,1fr);height:clamp(620px,calc(100vh - 110px),920px);background:var(--paper);border-radius:var(--radius);box-shadow:0 1px 2px rgba(23,25,30,.06);overflow:hidden}
.workspace:focus{outline:0}
.panel{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:auto;border-right:1px solid var(--line);overscroll-behavior:contain}
.open-card{padding:20px 20px 16px}
.open-card h2{font-size:16px;margin:0 0 12px}
.drop{position:relative;display:flex;align-items:center;gap:14px;padding:16px;border:1.5px dashed var(--line-strong);border-radius:10px;background:#fafbfc;cursor:pointer;transition:border-color .15s,background .15s}
.drop:hover,.drop.over{border-color:var(--blue);background:var(--blue-soft)}
.drop:focus-within{outline:3px solid rgba(34,87,214,.45);outline-offset:2px}
.drop-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--blue);color:#fff;flex:none}
.drop-icon svg{width:22px;height:22px}
.drop-text{display:flex;flex-direction:column;min-width:0;line-height:1.4}
.drop-text strong{font-size:15px}
.drop-sub,#limit{font-size:12px;color:var(--faint)}
.drop input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}
#filename{font-size:13px;color:var(--sub);margin:10px 0;overflow-wrap:anywhere}
#convert{display:flex;justify-content:space-between;align-items:center;width:100%;min-height:46px;padding:0 16px;background:var(--blue);color:#fff;font-weight:700;border-radius:10px}
#convert:not(:disabled):hover{background:var(--blue-dark)}
.has-drawing #convert{display:none}
#status{font-size:13px;color:var(--sub);margin:10px 0 0;min-height:21px}

.panel-tabs{position:sticky;top:0;z-index:2;display:flex;gap:4px;padding:8px 12px;background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
#workspace:not(.has-drawing) :is(.panel-tabs,[role=tabpanel]){display:none}
.panel-tabs button{flex:1;min-height:38px;font-size:14px;font-weight:600;color:var(--sub);border-radius:999px}
.panel-tabs button:hover{background:var(--bg)}
.panel-tabs button[aria-selected=true]{background:var(--ink);color:#fff}
[role=tabpanel]{padding:16px 20px 22px}
[role=tabpanel] h3{display:flex;justify-content:space-between;align-items:baseline;font-size:14px;margin:0 0 8px}
[role=tabpanel] h3 span{font-size:12px;font-weight:500;color:var(--faint)}
fieldset{border:0;padding:0;margin:0;min-width:0}
.layer-progress{font-size:12px;color:var(--faint);margin:0 0 10px;line-height:1.5}
.layer-progress:empty{display:none}
#layer-search{width:100%;margin:0 0 8px;padding:9px 12px;border:1px solid var(--line-strong);border-radius:8px;font-size:14px;background:#fff}
.layer-actions{display:flex;gap:6px}
.layer-actions button,.markup-layer-create button,.note button{flex:1;min-height:36px;padding:0 10px;font-size:13px;font-weight:600;background:var(--bg);color:var(--ink)}
.layer-actions button:not(:disabled):hover,.note button:hover{background:#e6e8ec}
#panel-layers:not([hidden]){display:flex;flex-direction:column;flex:1 0 300px;min-height:300px}
#layer-controls{display:flex;flex-direction:column;flex:1;min-height:0}
#layer-list{flex:1;min-height:120px;margin-top:10px;padding:0 12px;overflow:auto;overscroll-behavior:contain;border:1px solid var(--line);border-radius:10px;background:#fff}
#layer-list .layer-row:last-child{border-bottom:0}
#layer-list p,#markup-layer-list p{font-size:13px;color:var(--faint)}
.layer-row,.markup-layer-row{display:flex;align-items:center;gap:10px;min-height:42px;padding:2px 0;border-bottom:1px solid #f0f1f3}
.layer-row label,.markup-layer-row label{display:flex;align-items:center;gap:10px;flex:1;min-width:0;cursor:pointer;font-size:14px}
.layer-row label span,.markup-layer-row label span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.layer-row input[type=checkbox],.markup-layer-row input{width:18px;height:18px;flex:none;margin:0;accent-color:var(--blue)}
.layer-row input[type=color]{width:30px;height:30px;flex:none;padding:2px;margin:0;border:1px solid var(--line-strong);border-radius:8px;background:#fff;cursor:pointer}

.markup-layer-panel label{display:block;font-size:13px;font-weight:600;color:var(--sub);margin-top:6px}
.markup-layer-panel .markup-layer-row{display:flex;margin:0;font-size:14px;font-weight:500;color:var(--ink)}
.markup-layer-panel select{display:block;width:100%;max-width:100%;min-height:40px;margin:6px 0 10px;padding:0 10px;border:1px solid var(--line-strong);border-radius:8px;background:#fff;font-size:14px}
.markup-layer-create{display:flex;gap:6px;align-items:center}
.markup-layer-create select{flex:1;min-width:0;margin:0}
.markup-layer-create button{flex:none;min-height:40px;background:var(--blue-soft);color:var(--blue)}
#markup-layer-list{margin:8px 0 10px}
#selection-controls{padding:12px;background:var(--blue-soft);border-radius:10px;margin-top:8px}
#selection-controls strong{display:block;font-size:14px;margin-bottom:4px}
#selection-controls p{font-size:12px;color:var(--sub);margin:8px 0 0}
#selection-delete{display:inline-flex;align-items:center;gap:6px;min-height:38px;padding:0 14px;background:var(--red-soft);color:var(--red);font-weight:700;font-size:13px}
#selection-delete em,.note button em{font-style:normal}
#markup-state{font-size:12px;color:var(--faint);margin:12px 0 0}

.note p{font-size:13px;color:var(--sub);margin:0 0 12px}
.note h3{margin-top:18px}
.note h3:first-child{margin-top:0}
.note button{display:inline-flex;align-items:center;gap:8px;flex:none;margin-bottom:6px}
.keys{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:0;font-size:13px}
.keys dt{color:var(--faint)}
.keys dd{margin:0}
kbd{font:600 12px/1 var(--font);border:1px solid var(--line-strong);border-bottom-width:2px;border-radius:5px;padding:2px 5px;background:#fff}

.drawing{position:relative;display:flex;flex-direction:column;min-width:0;min-height:0}
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:56px;padding:8px 10px 8px 16px;border-bottom:1px solid var(--line)}
#title{font-size:14px;font-weight:700;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--sub)}
.view-tools{display:flex;gap:4px;flex:none}
.view-tools button,.markup-tools button,.file-button{position:relative;display:inline-flex;align-items:center;justify-content:center;min-width:40px;min-height:40px;padding:0 8px;color:var(--ink);background:transparent;border-radius:8px}
.view-tools button:not(:disabled):hover,.markup-tools button:not(:disabled):hover,.file-button:hover{background:var(--bg)}
.view-tools button[aria-pressed=true]{background:var(--ink);color:#fff}
#close:not(:disabled){color:var(--red)}
.markup-tools{border-bottom:1px solid var(--line);padding:6px 10px;background:#fafbfc}
.markup-tools [role=toolbar]{position:relative;display:flex;align-items:center;gap:6px;overflow-x:auto;scrollbar-width:none}
.markup-tools [role=toolbar]::-webkit-scrollbar{display:none}
.tool-group{display:flex;align-items:center;gap:2px;flex:none;padding-right:6px;border-right:1px solid var(--line)}
.tool-group:last-child{border-right:0}
.markup-tools button[aria-pressed=true]{background:var(--blue);color:#fff}
.swatch{display:grid;place-items:center;width:40px;height:40px;cursor:pointer}
.swatch input{width:28px;height:28px;padding:0;margin:0;border:2px solid #fff;border-radius:50%;box-shadow:0 0 0 1px var(--line-strong);cursor:pointer;background:none}
.swatch input::-webkit-color-swatch-wrapper{padding:0}
.swatch input::-webkit-color-swatch{border:0;border-radius:50%}
.width select{min-height:36px;padding:0 8px;border:1px solid var(--line-strong);border-radius:8px;background:#fff;font-size:13px}
.file-button{position:relative;overflow:hidden;cursor:pointer}
.file-button input{position:absolute;inset:0;margin:0;opacity:0;cursor:pointer}
.markup-tools:disabled{opacity:.5}
.markup-tools:disabled .file-button,.markup-tools:disabled .swatch{pointer-events:none}
#tool-hint{font-size:12px;color:var(--faint);margin:2px 4px 0}

#viewport{position:relative;flex:1;min-height:0;overflow:hidden;touch-action:none;overscroll-behavior:contain;background:var(--stage);cursor:grab;outline-offset:-3px}
#viewport:active{cursor:grabbing}
#viewport.light{background:#f5f7fa}
#viewport.over{box-shadow:inset 0 0 0 3px var(--blue)}
#viewport[data-tool=pen],#viewport[data-tool=text]{cursor:crosshair}
#viewport[data-tool=eraser]{cursor:cell}
#viewport[data-tool=select]{cursor:default}
#drawing,#labels,#annotations{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;user-select:none}
#empty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center;color:#9aa8bb;background-image:radial-gradient(#253042 1px,transparent 1px);background-size:20px 20px}
#viewport.light #empty{color:var(--faint);background-image:radial-gradient(#d3d9e2 1px,transparent 1px)}
.plan svg{width:52px;height:52px;color:#4a5a72}
#empty h2{font-size:17px;color:#e3e9f2;margin:14px 0 4px}
#viewport.light #empty h2{color:var(--ink)}
#empty p{font-size:13px;margin:0 0 16px}
.empty-pick{display:inline-flex;align-items:center;min-height:44px;padding:0 20px;border-radius:999px;background:#fff;color:var(--ink);font-weight:700;font-size:14px;cursor:pointer}
.empty-pick:hover{background:var(--blue-soft)}
.zoom-dock{position:absolute;right:12px;bottom:12px;z-index:5;display:flex;flex-direction:column;gap:2px;padding:4px;border-radius:14px;background:rgba(255,255,255,.94);box-shadow:0 4px 18px rgba(0,0,0,.22)}
.zoom-dock button{display:grid;place-items:center;width:44px;height:44px;color:var(--ink);border-radius:10px}
.zoom-dock button:not(:disabled):hover{background:var(--bg)}
.workspace:not(.has-drawing) .zoom-dock{display:none}
#toast{position:absolute;left:50%;top:12px;z-index:6;max-width:min(90%,460px);margin:0;padding:8px 14px;border-radius:999px;background:rgba(23,25,30,.88);color:#fff;font-size:13px;text-align:center;transform:translate(-50%,-8px);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s}
#toast.show{opacity:1;transform:translate(-50%,0)}
.footer{display:flex;justify-content:space-between;gap:10px;min-height:36px;align-items:center;padding:6px 14px;border-top:1px solid var(--line);font-size:12px;color:var(--faint)}
#metrics{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-variant-numeric:tabular-nums}
#zoom{font-weight:700;color:var(--sub);font-variant-numeric:tabular-nums}

#reading-overlay{position:absolute;inset:0;z-index:8;display:grid;place-items:center;background:rgba(14,19,27,.9);cursor:wait}
.reading-card{width:min(360px,88%);text-align:center;padding:28px 22px;border-radius:16px;background:#fff;color:var(--ink);box-shadow:0 20px 70px rgba(0,0,0,.35)}
.reading-spinner{display:block;width:36px;height:36px;border:3px solid #dfe5ee;border-top-color:var(--blue);border-radius:50%;margin:0 auto 18px;animation:reading-spin .9s linear infinite}
.reading-card strong{font-size:17px}
.reading-card p{font-size:13px;color:var(--sub);min-height:40px;overflow-wrap:anywhere;margin:6px 0 12px}
.reading-card progress{width:100%;height:6px;accent-color:var(--blue)}
.reading-steps{display:flex;justify-content:center;gap:12px;padding:0;margin:14px 0 0;list-style:none;font-size:12px;color:#a0a7b2}
.reading-steps li.active{color:var(--blue);font-weight:700}
.reading-steps li.done{color:#2e8a5f}
#reading-elapsed{display:block;font-size:12px;color:var(--faint);margin-top:10px}
#reading-retry{background:var(--blue);color:#fff;min-height:42px;padding:0 18px;margin-top:14px;font-weight:700}
.reading-card.error .reading-spinner{animation:none;border-color:#f0b4b0}
.reading-card.error strong{color:var(--red)}
@keyframes reading-spin{to{transform:rotate(360deg)}}

dialog{border:0;border-radius:16px;padding:24px;width:min(440px,calc(100vw - 32px));box-shadow:0 20px 80px rgba(16,32,53,.3);color:var(--ink)}
dialog::backdrop{background:rgba(16,32,53,.5)}
dialog h2{font-size:18px;margin:0 0 12px}
dialog label{font-size:13px;font-weight:600;color:var(--sub)}
#annotation-text,#markup-layer-name{display:block;width:100%;margin-top:8px;padding:12px;border:1px solid var(--line-strong);border-radius:10px;font-size:16px;line-height:1.5}
#annotation-text{resize:vertical}
dialog p{font-size:12px;color:var(--faint)}
dialog form>div{display:flex;justify-content:flex-end;gap:8px}
dialog button{min-height:44px;padding:0 18px;background:var(--bg);font-weight:600}
dialog button[value=save]{background:var(--blue);color:#fff}

.howto{padding:34px 0 10px}
.howto h2{font-size:20px;letter-spacing:-.4px;margin:0 0 14px}
.howto ol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;list-style:none;counter-reset:step;padding:0;margin:0}
.howto li{counter-increment:step;background:var(--paper);border-radius:var(--radius);padding:20px;box-shadow:0 1px 2px rgba(23,25,30,.06)}
.howto li::before{content:counter(step);display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--blue-soft);color:var(--blue);font-weight:800;font-size:14px;margin-bottom:10px}
.howto strong{display:block;font-size:16px;margin-bottom:4px}
.howto span{font-size:14px;color:var(--sub)}
.foot{margin-top:40px;padding:28px 0 40px;border-top:1px solid var(--line);font-size:13px;color:var(--faint)}
.foot p{margin:0 0 8px}
.foot a{color:var(--sub);text-decoration:none;margin-right:16px;display:inline-block;padding:4px 0}
.foot a:hover{color:var(--ink);text-decoration:underline}
.copy{margin-top:8px}

.workspace:fullscreen,.workspace.pseudo-full{width:100vw;height:100vh;height:100dvh;max-height:none;border-radius:0;grid-template-columns:300px minmax(0,1fr)}
.workspace.pseudo-full{position:fixed;inset:0;z-index:50}

@media(max-width:960px){.workspace{grid-template-columns:280px minmax(0,1fr)}.howto ol{grid-template-columns:1fr}}

@media(max-width:760px){
.wrap{width:calc(100% - 32px)}
.top-row{height:56px}
.brand{font-size:17px}
.intro{padding:22px 0 16px}
.intro p{font-size:15px}
.perks{margin-top:12px}
.perks li{font-size:12px}
.workspace{width:100%}
.workspace{display:flex;flex-direction:column;height:auto;border-radius:0;overflow:visible;box-shadow:none;background:transparent}
.panel{order:0;overflow:visible;border:0;background:var(--paper);margin:0 16px;border-radius:var(--radius);box-shadow:0 1px 2px rgba(23,25,30,.06)}
.drawing{order:1;margin-top:12px;background:var(--paper)}
.open-card{padding:18px 16px 14px}
.drop{padding:18px 16px}
#convert{min-height:50px;font-size:16px}
.panel-tabs{position:static;padding:8px}
.panel-tabs button{min-height:42px}
[role=tabpanel]{padding:14px 16px 18px}
#panel-layers:not([hidden]){flex:none;min-height:0}
#layer-list{flex:none;height:min(340px,55vh)}
.layer-row,.markup-layer-row{min-height:48px}
.toolbar{min-height:52px;padding:6px 6px 6px 14px}
.view-tools button{min-width:44px;min-height:44px}
.markup-tools{padding:6px}
.markup-tools button,.file-button{min-width:44px;min-height:44px}
.markup-tools [role=toolbar]{flex-wrap:wrap;column-gap:12px;row-gap:4px;overflow:visible}
.tool-group{border-right:0;padding-right:0}
.tool-group:nth-child(2){order:2}.tool-group:nth-child(3){order:1;margin-left:auto}.tool-group:nth-child(4){order:3;margin-left:auto}
#tool-hint{font-size:12px;margin:2px 6px 2px}
#toast{top:8px;width:max-content;max-width:calc(100% - 24px);padding:7px 12px;border-radius:12px;font-size:12.5px;line-height:1.45}
#viewport{flex:none;height:300px}
.footer{padding:6px 12px}
.workspace.has-drawing .drawing{order:0;margin-top:0}
.workspace.has-drawing .panel{order:1;margin-top:12px}
.workspace.has-drawing #viewport{height:max(360px,calc(100dvh - 230px))}
.workspace.has-drawing .open-card h2{display:none}
.workspace.has-drawing .drop{padding:10px 12px}
.workspace.has-drawing .drop-icon{width:36px;height:36px;border-radius:10px}
.workspace.has-drawing .drop-sub{display:none}
.zoom-dock{right:10px;bottom:10px}
.workspace:fullscreen,.workspace.pseudo-full{display:flex;margin:0;background:var(--paper)}
.workspace:fullscreen .panel,.workspace.pseudo-full .panel{display:none}
.workspace:fullscreen .drawing,.workspace.pseudo-full .drawing{flex:1;margin:0;min-height:0}
.workspace:fullscreen #viewport,.workspace.pseudo-full #viewport{flex:1;height:auto}
.workspace.pseudo-full{padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
.howto{padding-top:28px}
.foot{padding-inline:0}
}
@media(max-width:380px){.badge{display:none}#title{font-size:13px}.markup-tools button,.file-button{min-width:40px}.markup-tools [role=toolbar]{column-gap:8px}}
@media(prefers-reduced-motion:reduce){.reading-spinner{animation:none}#toast{transition:none}}
.foot .copy a{margin:0;color:inherit}
.foot .copy a:hover{color:var(--sub)}