:root{--bg:#0c0e10;--card:#111318;--text:#f1f3f5;--muted:#a3acb3;--accent:#2bb3ff;--border:#1c2127;--danger:#ff4d4f;--radius:16px;--pad:16px;--maxw:800px;}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif}
.container{max-width:var(--maxw);margin:0 auto;padding:16px}
.app-header{position:sticky;top:0;backdrop-filter:saturate(180%) blur(10px);background:linear-gradient( to bottom, rgba(12,14,16,.9), rgba(12,14,16,.6));border-bottom:1px solid var(--border);z-index:10}
.app-header .brand{display:flex;align-items:center;gap:10px;padding:10px 16px}
.app-header .brand .dot{width:10px;height:10px;border-radius:50%;background:var(--accent)}
.app-header h1{font-size:18px;margin:0}
.nav{position:absolute;right:8px;top:8px;display:flex;gap:8px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:var(--pad);margin:18px 0;box-shadow:0 6px 24px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.03)}
.row{display:flex;align-items:center;gap:12px}
.row.between{justify-content:space-between}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid .full{grid-column:1/-1}
label span{display:block;margin-bottom:6px;color:var(--muted);font-size:13px}
input,textarea,button{width:100%;padding:12px;border-radius:14px;border:1px solid var(--border);background:#0f1216;color:var(--text);font-size:16px}
input::placeholder,textarea::placeholder{color:#666}
button{background:var(--accent);border-color:transparent;color:#041014;font-weight:700;cursor:pointer}
button.secondary{background:#161a1f;color:var(--text)}
button:disabled{opacity:.6;cursor:not-allowed}
small,.small{font-size:12px}
.muted{color:var(--muted)}
.tabs{display:flex;gap:8px;margin-bottom:10px}
.tab{flex:1;background:#161a1f;border:1px solid var(--border);color:var(--text);border-radius:12px}
.tab.active{background:var(--accent);color:#041014;border-color:transparent}
.tab-panel{display:none}
.tab-panel.active{display:block}
.session-row{display:flex;align-items:center;justify-content:space-between}
.identity{font-weight:700}
.avatar{width:28px;height:28px;border-radius:50%;object-fit:cover;border:1px solid var(--border)}
.image-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px;margin-top:10px}
.image-item{border:1px dashed var(--border);border-radius:12px;padding:8px}
.image-item img{width:100%;height:120px;object-fit:cover;border-radius:8px}
.thread-list{display:flex;flex-direction:column;gap:10px;margin-top:10px}
.thread-item{border:1px solid var(--border);border-radius:12px;padding:8px;background:#0f1216}
.thread-item .controls{display:flex;gap:6px}
.footer{border-top:1px solid var(--border);padding:16px 0;margin-top:40px;color:var(--muted)}
fieldset{border:1px solid var(--border);border-radius:10px}
legend{color:var(--muted)}

/* iOS: prevent zoom on focus by ensuring >=16px */
@supports (-webkit-touch-callout: none){
  input,textarea,select{font-size:17px}
}

input:focus, textarea:focus, button:focus { outline: 2px solid var(--accent); outline-offset: 0; }

@media (max-width:720px){
  .grid{grid-template-columns:1fr}
}