/* 3D.OS — application layer */
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.tool-card{padding:24px;min-height:210px;display:flex;flex-direction:column;justify-content:space-between;text-decoration:none;transition:transform .25s,border-color .25s,box-shadow .25s;position:relative;overflow:hidden}
.tool-card::before{content:"";position:absolute;inset:0 0 auto;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2));transform:scaleX(0);transform-origin:left;transition:transform .25s}
.tool-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 18px 38px rgba(20,25,40,.1)}
.tool-card:hover::before{transform:scaleX(1)}
.tool-card h3{font-size:1.05rem;margin:8px 0 6px}
.tool-card p{font-size:.8rem;color:var(--soft);margin:0;line-height:1.7}
.tool-card .tag{font-size:.6rem;letter-spacing:.14em;text-transform:uppercase;color:var(--soft)}
.tool-card .go{font-size:1.35rem;margin-top:18px;color:var(--accent)}

.tool-split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.tool-panel{border:1px solid var(--thin);background:var(--glass-strong);padding:clamp(20px,3vw,30px);box-shadow:0 12px 34px rgba(20,25,40,.06)}
.tool-panel h2{font-size:1.15rem;margin-bottom:18px;font-weight:800}
.tool-toolbar{display:flex;justify-content:space-between;align-items:center;gap:14px;margin:0 0 12px;padding:10px 12px;border:1px solid var(--faint);background:color-mix(in srgb,var(--paper2) 72%,transparent)}
.tool-status{display:flex;align-items:center;gap:8px;font-size:.68rem;color:var(--soft);letter-spacing:.04em}
.tool-status i{width:8px;height:8px;border-radius:50%;background:#36b36b;box-shadow:0 0 0 4px color-mix(in srgb,#36b36b 16%,transparent)}
.tool-export{border:0;background:transparent;color:var(--accent);font:700 .65rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;cursor:pointer}

.fg{margin-bottom:12px}
.fg label{display:block;font-size:.65rem;color:var(--soft);font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px;font-weight:700}
.fg input,.fg select{width:100%;border:1px solid var(--thin);background:var(--paper2);color:var(--ink);padding:11px 12px;font:inherit;transition:border-color .18s,box-shadow .18s}
.fg input:focus,.fg select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 12%,transparent)}
.fg input.invalid{border-color:#d04b4b}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.form-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.splitline{height:1px;background:var(--thin);margin:18px 0}
.result-val{border:1px solid var(--faint);padding:15px;background:color-mix(in srgb,var(--paper2) 62%,transparent);min-width:0}
.result-val b{display:block;font-size:clamp(1.1rem,2.3vw,1.55rem);font-weight:800;letter-spacing:-.03em;font-family:var(--mono);color:var(--accent);overflow-wrap:anywhere}
.result-val span{font-size:.6rem;color:var(--soft);text-transform:uppercase;letter-spacing:.1em}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.result-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.engine-log{white-space:pre-wrap;min-height:120px;background:#11151d;color:#b9c9df;border:1px solid #283348;border-left:3px solid var(--accent);padding:14px;margin-top:14px;overflow:auto;font-size:.74rem;font-family:var(--mono);line-height:1.65}
.engine-log[data-state="success"]{border-left-color:#36b36b}
.engine-log[data-state="warning"]{border-left-color:#d89a2b}
.engine-log[data-state="error"]{border-left-color:#d04b4b}
.file-input{width:100%;border:1px solid var(--thin);background:var(--paper2);padding:10px;font:inherit;font-size:.85rem}
.upload-zone{min-height:190px;border:1px dashed var(--line);display:grid;place-items:center;text-align:center;background:color-mix(in srgb,var(--paper2) 58%,transparent);color:var(--soft);padding:24px;transition:border-color .2s,background .2s}
.upload-zone:focus-within,.upload-zone:hover{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 5%,var(--paper2))}
.check-row{display:flex;gap:16px;flex-wrap:wrap;margin:12px 0;font-size:.78rem;color:var(--soft)}
.check-row label{display:flex;align-items:center;gap:7px}

.format-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}
.format-grid b{border:1px solid var(--faint);padding:12px;background:var(--glass-strong);font-weight:700;text-align:center;font-size:.78rem;cursor:pointer;transition:.18s}
.format-grid b:hover,.format-grid b.active{border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 7%,var(--paper))}
.format-inspector{margin-top:14px}
.swatch-row{display:flex;gap:0;flex-wrap:wrap;border:1px solid var(--line)}
.swatch{flex:1;min-width:52px;height:40px;border:1px solid var(--line);cursor:pointer}
.file-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
.metric-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:18px 0}
.preset-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.preset{border:1px solid var(--thin);background:var(--paper2);padding:7px 10px;font:700 .65rem/1 var(--mono);color:var(--soft);cursor:pointer}
.preset:hover{border-color:var(--accent);color:var(--accent)}

.os-command{position:fixed;inset:0;z-index:1000;display:none;align-items:flex-start;justify-content:center;padding:96px 18px;background:rgba(7,10,16,.66);backdrop-filter:blur(12px)}
.os-command.open{display:flex}
.os-dialog{width:min(720px,100%);border:1px solid var(--thin);background:var(--paper);box-shadow:0 30px 90px rgba(0,0,0,.28);padding:22px}
.os-dialog-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:16px}
.os-dialog-head span{font:700 .6rem/1 var(--mono);letter-spacing:.14em;color:var(--accent)}
.os-dialog-head h2{font-size:1.25rem;margin:5px 0 0}
.os-dialog-head button{width:32px;height:32px;border:1px solid var(--thin);background:transparent;color:var(--ink);font-size:1.25rem;cursor:pointer}
.os-dialog>input{width:100%;border:1px solid var(--line);background:var(--paper2);color:var(--ink);padding:13px 14px;font:inherit}
.os-results{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:14px}
.os-results a{display:grid;gap:4px;border:1px solid var(--faint);padding:12px;background:var(--paper2)}
.os-results a:hover{border-color:var(--accent)}
.os-results b{font-size:.78rem}.os-results span{font-size:.66rem;color:var(--soft)}
.os-settings{position:fixed;z-index:1001;top:84px;right:18px;width:min(360px,calc(100% - 36px));display:none;border:1px solid var(--thin);background:var(--paper);padding:20px;box-shadow:0 24px 70px rgba(0,0,0,.22)}
.os-settings.open{display:block}
.os-settings>button{width:100%;border:1px solid var(--thin);background:var(--paper2);color:var(--ink);padding:11px;margin-top:8px;text-align:left;cursor:pointer}
.os-settings label{display:grid;gap:6px;margin-top:14px;font-size:.68rem;color:var(--soft)}
.os-settings input{width:100%;border:1px solid var(--thin);background:var(--paper2);color:var(--ink);padding:10px}
[dir="rtl"] .os-settings{right:auto;left:18px}

[dir="rtl"] main{direction:rtl;text-align:right}
[dir="rtl"] .tool-card::before{transform-origin:right}
[dir="rtl"] .engine-log{border-left:1px solid #283348;border-right:3px solid var(--accent)}
[dir="rtl"] .top-ribbon,[dir="rtl"] .header,[dir="rtl"] .subbar,[dir="rtl"] .directory-nav,[dir="rtl"] .site-footer{direction:ltr;text-align:left}

@media(max-width:1000px){
  .tool-grid{grid-template-columns:repeat(2,1fr)}
  .tool-split{grid-template-columns:1fr}
  .format-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:680px){
  .tool-grid,.form-grid,.form-grid.cols-3,.result-grid,.result-grid.cols-3,.metric-strip,.file-facts{grid-template-columns:1fr}
  .format-grid{grid-template-columns:repeat(2,1fr)}
  .tool-toolbar{align-items:flex-start;flex-direction:column}
  .os-command{padding:72px 12px 12px}.os-dialog{padding:16px}.os-results{grid-template-columns:1fr}
  .os-settings{top:auto;bottom:12px;left:12px;right:12px;width:auto}
}