/* ==========================================================================
   StoneSmartAI – Chat Header (Phase 7 – CSS Cleanup)
   Ownership: Header positioning (sticky/fixed) + safe-area padding + z-index
   ========================================================================== */

body[data-page="chat"] .chat-header{
  position: sticky;
  top: 0;
  z-index: 900;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;

  padding: calc(10px + var(--safeTop)) 16px 10px;
  min-height: var(--headerH);

  background: var(--card);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

body[data-page="chat"] .left,
body[data-page="chat"] .right{
  display:flex;
  align-items:center;
  gap:10px;
}

body[data-page="chat"] .active-project{
  font-size:12px;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(0,0,0,.12);
  color:var(--text);
  max-width:220px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

body[data-page="chat"] .status-chip{
  font-size:12px;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(0,0,0,.12);
  color:var(--text);
  max-width:220px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

body[data-page="chat"] .user-status{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(0,0,0,.12);
}
body[data-page="chat"] .user-status .user-action{
  color:inherit;
  text-decoration:none;
  opacity:.9;
}
body[data-page="chat"] .user-status .user-action:hover{
  text-decoration:underline;
}

body[data-page="chat"] #chat-title{
  margin:0;
  font-size:16px;
  font-weight:700;
  letter-spacing:-0.02em;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  max-width: clamp(180px, 45vw, 560px);
}

body[data-page="chat"] .icon-btn{
  appearance:none;
  border:1px solid var(--line);
  background: rgba(255,255,255,0.45);
  color: var(--text);
  border-radius: 14px;
  padding:10px 12px;
  cursor:pointer;
  box-shadow: var(--shadow);
  transition: transform .12s ease, filter .12s ease;
}
html[data-theme="dark"] body[data-page="chat"] .icon-btn{
  background: rgba(30,41,59,0.55);
}
body[data-page="chat"] .icon-btn:hover{ filter: brightness(1.05); transform: translateY(-1px); }
body[data-page="chat"] .icon-btn:active{ transform: translateY(0); }
body[data-page="chat"] .icon-btn.is-active{
  outline:2px solid var(--ring);
}

/* Mobile/iOS: header must be fixed at viewport top */
@media (max-width: 980px){
  body[data-page="chat"] .chat-header{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    border-radius: 0;
    z-index: 2500;
  }
  body[data-page="chat"] .active-project,
  body[data-page="chat"] .user-status,
  body[data-page="chat"] .status-chip{
    display:none;
  }
}

/* Desktop: Open-Button nur zeigen, wenn Sidebar kollabiert ist */
@media (min-width: 981px){
  body[data-page="chat"] #open-sidebar{ display: none !important; }
  body[data-page="chat"] .app.sidebar-collapsed #open-sidebar{ display: inline-flex !important; }
}

/* Mobile: Header-Hamburger anzeigen */
@media (max-width: 980px){
  body[data-page="chat"] #open-sidebar{ display: inline-flex; }
}

/* ==========================================================================
   iOS Safari (Mobile) – backdrop-filter seam fix
   ========================================================================== */
@supports (-webkit-touch-callout: none){
  @media (max-width: 980px){
    body[data-page="chat"] .chat-header{
      -webkit-backdrop-filter: none !important;
      backdrop-filter: none !important;
      background: rgba(255,255,255,0.92) !important;
    }
    html[data-theme="dark"] body[data-page="chat"] .chat-header{
      background: rgba(15,23,42,0.92) !important;
    }
  }
}