.supervisor-body { overflow: hidden; }

#app {
  display: flex;
  height: 100dvh;
  overflow: hidden;
}

/* ── Sidebar ── */
#session-list {
  width: 300px;
  min-width: 200px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  background: var(--surface);
  flex-shrink: 0;
  overflow: hidden;
}

.sup-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sup-subtitle { color: var(--text-dim); font-size: 0.82rem; }
.sup-header-actions { margin-left: auto; display: flex; gap: 0.4rem; align-items: center; }

.header-action-btn {
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}
.header-action-btn:hover { background: rgba(255,255,255,0.12); }
.header-action-btn.hidden { display: none; }

#sessions-container { flex: 1; overflow-y: auto; }

.client-group-header {
  padding: 0.5rem 1.25rem 0.3rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.client-group-header:first-child { border-top: none; }
.client-online-dot  { width: 6px; height: 6px; border-radius: 50%; background: #4ade80; flex-shrink: 0; }
.client-offline-dot { width: 6px; height: 6px; border-radius: 50%; background: #ef4444; flex-shrink: 0; }

.session-item {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s;
}
.session-item:hover { background: rgba(255,255,255,0.04); }
.session-item.active { background: rgba(99,102,241,0.12); border-left: 3px solid var(--accent); padding-left: calc(1.25rem - 3px); }

.session-meta { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 0.2rem; }
.session-id-label { font-family: monospace; font-size: 0.75rem; color: var(--text-dim); }
.session-time { font-size: 0.72rem; color: var(--text-dim); }
.session-preview { font-size: 0.84rem; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-badge { font-size: 0.72rem; color: var(--text-dim); margin-top: 0.15rem; }

/* ── Main panel ── */
#chat-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

#empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.95rem;
}

#conversation {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#conv-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#conv-client-name { font-weight: 600; font-size: 0.95rem; }
#conv-session-id  { font-family: monospace; font-size: 0.72rem; color: var(--text-dim); margin-top: 0.1rem; }
#conv-age         { font-size: 0.75rem; color: var(--text-dim); margin-left: auto; }

#conv-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.msg-wrap { display: flex; flex-direction: column; }
.msg-label {
  font-size: 0.68rem;
  color: var(--text-dim);
  margin-bottom: 0.15rem;
  padding: 0 0.2rem;
}
.msg-wrap.user .msg-label,
.msg-wrap.supervisor .msg-label,
.msg-wrap.whisper .msg-label { text-align: right; }
.msg-wrap.whisper-reply .msg-label { text-align: left; color: #4f9e6f; }

/* ── Input area ── */
#conv-input-area {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
  align-items: flex-end;
  flex-shrink: 0;
}

#conv-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.9rem;
  padding: 0.6rem 0.9rem;
  resize: none;
  outline: none;
  max-height: 6rem;
  overflow-y: auto;
  font-family: inherit;
  line-height: 1.4;
}
#conv-input:focus { border-color: var(--accent); }

#conv-btns { display: flex; flex-direction: column; gap: 0.35rem; flex-shrink: 0; }

#send-visible-btn, #send-whisper-btn {
  border: none;
  border-radius: 6px;
  padding: 0.4rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s;
}
#send-visible-btn       { background: var(--accent); color: #fff; }
#send-visible-btn:hover { background: var(--accent-dim); }
#send-whisper-btn       { background: #7c3aed; color: #fff; }
#send-whisper-btn:hover { background: #6d28d9; }
#send-visible-btn:disabled,
#send-whisper-btn:disabled { opacity: 0.45; cursor: not-allowed; }

#back-btn {
  display: none;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0 0.25rem 0 0;
  line-height: 1;
  flex-shrink: 0;
}

/* ── Credits panel ── */
#credits-panel {
  flex: 1; display: flex; flex-direction: column; overflow: hidden;
}
#credits-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface); border-bottom: 1px solid var(--border);
  font-weight: 600; font-size: 0.95rem; flex-shrink: 0;
}
#credits-back-btn {
  background: none; border: none; color: var(--accent);
  font-size: 1.3rem; cursor: pointer; padding: 0; line-height: 1;
}
#credits-list {
  flex: 1; overflow-y: auto; padding: 1rem 1.25rem;
  display: flex; flex-direction: column; gap: 0.75rem;
}
.credits-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 1rem 1.1rem;
}
.credits-card-header {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 0.75rem;
}
.credits-client-name { font-weight: 600; font-size: 0.95rem; }
.credits-balance {
  font-size: 0.82rem; font-weight: 700;
  color: var(--accent); font-variant-numeric: tabular-nums;
}
.credits-balance.low   { color: #f59e0b; }
.credits-balance.empty { color: #f87171; }
.credits-topup-row { display: flex; gap: 0.5rem; }
.credits-amount-input {
  flex: 1; background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text); font-size: 0.88rem;
  padding: 0.45rem 0.75rem; outline: none;
}
.credits-amount-input:focus { border-color: var(--accent); }
.credits-topup-btn {
  background: #10b981; color: #fff; border: none;
  border-radius: 6px; padding: 0.45rem 0.9rem;
  font-size: 0.82rem; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: background 0.15s;
}
.credits-topup-btn:hover    { background: #059669; }
.credits-topup-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.credits-feedback { font-size: 0.75rem; margin-top: 0.35rem; color: #4ade80; min-height: 1rem; }

@media (max-width: 640px) {
  #session-list { width: 100%; min-width: 100%; border-right: none; }
  #chat-panel { display: none; }
  #back-btn { display: block; }
  #app.mobile-session-open #session-list { display: none; }
  #app.mobile-session-open #chat-panel  { display: flex; }
}