:root {
  --bg: #0f0f13;
  --surface: #1a1a24;
  --surface2: #22222f;
  --border: #2e2e45;
  --accent: #c89b3c;
  --accent2: #8b5cf6;
  --text: #e8e8f0;
  --text-dim: #888899;
  --danger: #e05252;
  --success: #52c97a;
  --tool-bg: #1e1e2e;
  --tool-border: #3a3a5c;
  --sidebar-width: 280px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: 'Segoe UI', system-ui, sans-serif; height: 100vh; display: flex; flex-direction: column; }

header { background: var(--surface); border-bottom: 1px solid var(--border); padding: 10px 20px; display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
header h1 { font-size: 1.1rem; color: var(--accent); font-weight: 600; }
header .status { margin-left: auto; font-size: 0.8rem; color: var(--text-dim); display: flex; align-items: center; gap: 6px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-dim); }
.dot.ok { background: var(--success); }
.dot.err { background: var(--danger); }

.main { display: flex; flex: 1; overflow: hidden; }

.chat-area { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
#messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }

.msg { position: relative; max-width: 85%; border-radius: 10px; padding: 22px 14px 10px; line-height: 1.5; font-size: 0.92rem; }
.msg-time { position: absolute; top: 6px; right: 10px; font-size: 0.68rem; color: var(--text-dim); opacity: 0.85; white-space: nowrap; }
.msg.user { background: var(--accent2); align-self: flex-end; }
.msg.user .msg-time { color: rgba(255,255,255,0.75); }
.msg.assistant { background: var(--surface2); border: 1px solid var(--border); align-self: flex-start; }
.msg.system { background: transparent; border: 1px solid var(--tool-border); align-self: center; color: var(--text-dim); font-size: 0.82rem; text-align: center; max-width: 60%; padding-top: 22px; }
.msg pre { white-space: pre-wrap; word-break: break-word; }

.tool-block { background: var(--tool-bg); border: 1px solid var(--tool-border); border-radius: 6px; padding: 6px 10px; font-size: 0.8rem; color: var(--text-dim); margin-top: 6px; }
.tool-block summary { cursor: pointer; list-style: none; }
.tool-block summary::-webkit-details-marker { display: none; }
.tool-block pre { margin: 6px 0 0; white-space: pre-wrap; word-break: break-all; font-size: 0.75rem; }
.tool-block .tool-name { color: var(--accent); font-weight: 600; }

#sidebar-export-section { display: none; }
#sidebar-export-section.active { display: block; }
.sidebar-export-link { font-size: 0.75rem; color: var(--accent); word-break: break-all; margin-bottom: 8px; line-height: 1.4; }
.sidebar-export-link a { color: var(--accent); text-decoration: none; }
.sidebar-export-link a:hover { text-decoration: underline; }
.sidebar-export-actions { display: flex; flex-direction: column; gap: 6px; }
.sidebar-export-actions button {
  width: 100%; background: var(--surface2); border: 1px solid var(--border); color: var(--text);
  padding: 8px 10px; border-radius: 6px; cursor: pointer; font-size: 0.82rem; transition: all 0.15s; text-align: left;
}
.sidebar-export-actions button:hover { border-color: var(--accent); color: var(--accent); }
.sidebar-export-actions button.pob2 { border-color: var(--accent2); color: var(--accent2); font-weight: 600; }
.sidebar-export-actions button.pob2:hover { background: var(--accent2); color: #fff; }
.sidebar-export-actions button.copied { background: var(--success); border-color: var(--success); color: #000; }

.input-area { padding: 12px 16px; background: var(--surface); border-top: 1px solid var(--border); display: flex; gap: 10px; flex-shrink: 0; }
#msg-input { flex: 1; background: var(--surface2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); padding: 10px 14px; font-size: 0.92rem; resize: none; outline: none; min-height: 42px; max-height: 120px; font-family: inherit; }
#msg-input:focus { border-color: var(--accent2); }
#send-btn { background: var(--accent2); border: none; color: #fff; padding: 0 18px; border-radius: 8px; cursor: pointer; font-size: 0.9rem; font-weight: 600; transition: opacity 0.15s; }
#send-btn:hover { opacity: 0.85; }
#send-btn:disabled { opacity: 0.4; cursor: default; }

.sidebar { width: var(--sidebar-width); background: var(--surface); border-left: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden; flex-shrink: 0; }
.sidebar-section { padding: 14px 16px; border-bottom: 1px solid var(--border); }
.sidebar-section h3 { font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 10px; }
.save-btn { margin-top: 8px; width: 100%; background: var(--surface2); border: 1px solid var(--border); color: var(--text); padding: 7px; border-radius: 6px; cursor: pointer; font-size: 0.82rem; }
.save-btn:hover { border-color: var(--accent); color: var(--accent); }

.pob2-sync-btn { width: 100%; background: var(--surface2); border: 1px solid var(--accent2); color: var(--accent2); padding: 9px; border-radius: 6px; cursor: pointer; font-size: 0.85rem; font-weight: 600; margin-top: 6px; }
.pob2-sync-btn:hover { background: var(--accent2); color: #fff; }

.char-entry { background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 7px 10px; cursor: pointer; transition: border-color 0.15s; }
.char-entry:hover { border-color: var(--accent); }
.char-entry .char-name { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.char-entry .char-info { font-size: 0.75rem; color: var(--text-dim); margin-top: 2px; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.typing { display: flex; gap: 4px; align-items: center; padding: 8px 12px; }
.typing span { width: 7px; height: 7px; background: var(--text-dim); border-radius: 50%; animation: bounce 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce { 0%,60%,100% { transform: translateY(0); } 30% { transform: translateY(-6px); } }

.setting-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #666;
  margin: 18px 0 8px 0;
  padding-top: 14px;
  border-top: 1px solid #333;
}
.setting-group {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}