.tools-header{gap:16px;padding:20px 0}
.brand{min-width:0}
.brand-logo{display:block;flex:none;width:48px;height:48px;object-fit:contain}
.tools-header .brand strong{font-size:21px;line-height:1.2}
.tools-header .brand small{display:block;margin-top:4px;line-height:1.4}
.header-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.header-actions button{min-height:42px;padding:8px 14px}
main{
  display:grid;grid-template-columns:minmax(175px, .8fr) minmax(0, 2.3fr) minmax(245px, 1fr);
  min-height:min(620px, calc(100dvh - 110px));margin:16px 0 24px;
  border:1px solid var(--border);border-radius:17px;overflow:hidden;
  background:var(--surface);box-shadow:var(--shadow)
}
aside,.settings,.paper{min-width:0;padding:18px}
aside{border-right:1px solid var(--border)}
.settings{border-left:1px solid var(--border)}
main h1,main h2{font-size:16px;line-height:1.4;margin:0 0 14px;overflow-wrap:anywhere}
nav,#options{display:grid;gap:8px}
nav button{min-height:42px;text-align:left;background:transparent;border:1px solid transparent;color:var(--fg);padding:8px 10px;overflow-wrap:anywhere}
nav button:hover,nav button[aria-pressed=true]{background:var(--sub);color:var(--blue)}
.viewer{min-width:0;display:flex;flex-direction:column;background:var(--sub)}
.paper{flex:1}
.bar{display:flex;justify-content:center;align-items:center;gap:8px;padding:8px 18px;border-top:1px solid var(--border)}
#page-controls[hidden]{display:none}
.bar button,#options button:not(.primary),#options select,#options input:not([type=checkbox]){
  border:1px solid var(--border);background:var(--surface);color:var(--fg);
  border-radius:8px;padding:8px 10px;font:inherit
}
#options label{display:grid;gap:6px;min-width:0}
#options button,#options select,#options input:not([type=checkbox]){width:100%;min-width:0;min-height:40px}
#options small,#status{color:var(--muted);overflow-wrap:anywhere}
#status{margin:12px 0 0;font-size:12px;line-height:1.7}
#status:empty{display:none}
#options .ai-toggle{display:flex;align-items:center;gap:8px;min-height:32px}
#transcript{width:100%;min-height:110px;height:clamp(110px,24vh,230px);resize:vertical;padding:10px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--fg);line-height:1.6}
#drop-zone{display:grid;place-items:center;align-content:center;gap:8px;width:100%;min-height:172px;padding:16px;border:2px dashed var(--border);background:var(--surface);color:var(--fg)}
#drop-zone:hover,#drop-zone.dragging{border-color:var(--blue)}
#drop-zone span{font-size:28px;color:var(--blue)}
#drop-zone small{color:var(--muted)}
#files{display:grid;gap:8px;margin:12px 0 0;padding:0;list-style:none}
#files:empty{margin:0}
#files li{display:flex;align-items:center;gap:10px;min-width:0;padding:10px;border:1px solid var(--border);border-radius:10px;background:var(--surface);overflow-wrap:anywhere}
.file-icon{display:grid;place-items:center;flex:none;width:42px;min-height:34px;background:var(--blue);color:white;border-radius:7px;font-size:11px;font-weight:700}
#guide{width:min(700px,calc(100% - 28px));max-height:85dvh;padding:24px;border:1px solid var(--border);border-radius:17px;background:var(--surface);color:var(--fg);line-height:1.65}
#guide::backdrop{background:#10151e99}
.guide-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.guide-heading h2{font-size:17px;margin:0}
#guide h3{margin:22px 0 6px;color:var(--blue)}
#guide p{margin:8px 0}
#guide ol{padding-left:24px}
@media(max-width:850px){
  main{grid-template-columns:minmax(0,1fr) minmax(230px,.8fr)}
  aside{grid-column:1/-1;border-right:0;border-bottom:1px solid var(--border)}
  nav{grid-template-columns:repeat(4,minmax(0,1fr))}
}
@media(max-width:560px){
  .tools-header{align-items:flex-start;flex-wrap:wrap}
  main{grid-template-columns:minmax(0,1fr);min-height:0}
  aside,.settings,.paper{padding:14px}
  nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .settings{border-left:0;border-top:1px solid var(--border)}
  #drop-zone{min-height:135px}
  #guide{padding:16px}
}
#theme{display:grid;place-items:center;width:42px;height:42px;padding:0}

.file-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:14px}
.file-heading h2{margin:0}
.file-heading button,.file-controls button{padding:6px 9px}
.file-name{flex:1;min-width:0}
.file-controls{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}