:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-input: #1c2333;
  --bg-hover: #21262d;
  --border: #30363d;
  --border-light: #484f58;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --text-dimmer: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-dim: rgba(88,166,255,0.15);
  --green: #3fb950;
  --green-dim: rgba(63,185,80,0.15);
  --yellow: #d29922;
  --yellow-dim: rgba(210,153,34,0.15);
  --red: #f85149;
  --red-dim: rgba(248,81,73,0.15);
  --purple: #bc8cff;
  --purple-dim: rgba(188,140,255,0.15);
  --radius: 12px;
  --radius-sm: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

.screen { height: 100%; display: flex; flex-direction: column; }
.hidden { display: none !important; }

/* ─── Login ──────────────────────────────────────────── */
#login-screen {
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(ellipse at top, #161b22 0%, #0d1117 70%);
}
.login-card {
  width: 100%; max-width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.logo { display: flex; flex-direction: column; align-items: center; gap: 12px; color: var(--accent); }
.logo h1 { font-size: 22px; font-weight: 600; color: var(--text); }
.subtitle { color: var(--text-dim); font-size: 14px; margin: 8px 0 24px; }
#login-form { display: flex; flex-direction: column; gap: 12px; }
#login-form input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: border-color 0.15s;
}
#login-form input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
#login-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
#login-form button:active { background: var(--accent-hover); }
.error { color: var(--red); font-size: 14px; margin-top: 12px; min-height: 20px; }

/* ─── Header ─────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 10px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.header-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.icon-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}
.icon-btn:active { background: var(--bg-hover); color: var(--text); }
.model-select {
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-appearance: none;
  appearance: none;
  padding: 2px 0;
}
.model-select option { background: var(--bg-card); color: var(--text); }
.mcp-badges {
  display: flex;
  gap: 4px;
  flex-wrap: nowrap;
  overflow: hidden;
  min-height: 16px;
}
.mcp-badge {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--green-dim);
  color: var(--green);
  white-space: nowrap;
  font-weight: 600;
}
.mcp-badge.off { background: var(--bg-input); color: var(--text-dimmer); }

/* ─── Drawer ─────────────────────────────────────────── */
.drawer {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 300px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s;
}
.drawer-right {
  left: auto;
  right: 0;
  border-right: none;
  border-left: 1px solid var(--border);
  width: 340px;
}
.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.drawer-header h2 { font-size: 16px; font-weight: 600; }
#sessions-list { flex: 1; overflow-y: auto; padding: 8px; }
.session-item {
  padding: 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: 4px;
  transition: background 0.15s;
}
.session-item:active { background: var(--bg-input); }
.session-item .preview { font-size: 13px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-item .meta { font-size: 11px; color: var(--text-dimmer); margin-top: 4px; }
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

/* ─── Tools panel ────────────────────────────────────── */
.tools-content { flex: 1; overflow-y: auto; padding: 16px; }
.tools-section { margin-bottom: 24px; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
.tools-section h3 { font-size: 13px; font-weight: 700; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }
.section-hint { font-size: 11px; color: var(--text-dimmer); margin-bottom: 10px; }
.mcp-item {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 6px;
  font-size: 13px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.mcp-item-info { flex: 1; min-width: 0; }
.mcp-item .mcp-name { font-weight: 600; display: flex; align-items: center; gap: 6px; font-size: 13px; }
.mcp-item .mcp-status-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.mcp-item .mcp-status-dot.connected { background: var(--green); }
.mcp-item .mcp-status-dot.disconnected { background: var(--red); }
.mcp-item .mcp-tools { color: var(--text-dim); font-size: 11px; margin-top: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Toggle switch */
.toggle {
  position: relative;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle .slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--border);
  border-radius: 20px;
  transition: 0.2s;
}
.toggle .slider:before {
  content: "";
  position: absolute;
  height: 16px; width: 16px;
  left: 2px; bottom: 2px;
  background: white;
  border-radius: 50%;
  transition: 0.2s;
}
.toggle input:checked + .slider { background: var(--green); }
.toggle input:checked + .slider:before { transform: translateX(16px); }

.skill-item {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 6px;
}
.skill-item .skill-name { font-weight: 600; font-size: 13px; }
.skill-item .skill-desc { color: var(--text-dim); font-size: 12px; margin-top: 4px; }
.builtin-tool-item {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-bottom: 4px;
}
.builtin-tool-item .bt-name { font-weight: 600; font-family: monospace; font-size: 12px; color: var(--accent); }
.builtin-tool-item .bt-desc { color: var(--text-dim); font-size: 11px; margin-top: 2px; }
.small-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  color: var(--text);
  font-size: 11px;
  cursor: pointer;
}
.small-btn:active { background: var(--border); }

/* ─── Welcome screen ─────────────────────────────────── */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 40px 24px;
  text-align: center;
}
.welcome-icon { color: var(--text-dimmer); margin-bottom: 16px; }
.welcome h2 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.welcome p { color: var(--text-dim); font-size: 14px; max-width: 300px; margin-bottom: 24px; }
.suggestions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.suggestion-chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 14px;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}
.suggestion-chip:active { background: var(--accent-dim); border-color: var(--accent); }

/* ─── Messages ───────────────────────────────────────── */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  -webkit-overflow-scrolling: touch;
}
.msg { max-width: 88%; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.msg.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--accent), #4d9bf6);
  color: #fff;
  border-radius: 18px 18px 4px 18px;
  padding: 10px 15px;
  box-shadow: 0 2px 8px rgba(88,166,255,0.2);
}
.msg.assistant {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px 18px 18px 4px;
  padding: 12px 15px;
  line-height: 1.6;
}
.msg.assistant pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
  font-size: 12px;
  font-family: "SF Mono", Monaco, "Cascadia Code", "Courier New", monospace;
}
.msg.assistant code { font-family: "SF Mono", Monaco, monospace; font-size: 12px; }
.msg.assistant p { margin-bottom: 8px; }
.msg.assistant p:last-child { margin-bottom: 0; }
.msg.assistant a { color: var(--accent); }
.msg.assistant ul, .msg.assistant ol { margin: 8px 0; padding-left: 20px; }
.msg.assistant li { margin-bottom: 4px; }
.msg.assistant h1, .msg.assistant h2, .msg.assistant h3 { margin: 12px 0 6px; font-size: 15px; font-weight: 600; }

/* Tool call cards */
.tool-card {
  align-self: flex-start;
  max-width: 90%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--yellow);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  animation: fadeIn 0.2s;
}
.tool-card.executing { border-left-color: var(--accent); }
.tool-card.done { border-left-color: var(--green); }
.tool-card .tool-header { display: flex; align-items: center; gap: 6px; }
.tool-card .tool-name { font-weight: 700; color: var(--yellow); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
.tool-card.executing .tool-name { color: var(--accent); }
.tool-card.done .tool-name { color: var(--green); }
.tool-card .tool-spinner { width: 12px; height: 12px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
.tool-card .tool-args { color: var(--text-dim); margin: 6px 0; font-family: monospace; font-size: 11px; white-space: pre-wrap; word-break: break-all; background: var(--bg); padding: 6px 8px; border-radius: 4px; }
.tool-card .tool-result {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-family: monospace;
  font-size: 11px;
  color: var(--text-dim);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 250px;
  overflow-y: auto;
  background: var(--bg);
  padding: 8px;
  border-radius: 4px;
}

/* Status indicator */
.status-indicator {
  align-self: flex-start;
  color: var(--text-dim);
  font-size: 13px;
  padding: 4px 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.spinner {
  width: 14px; height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Typing dots */
.typing-dots { display: flex; gap: 4px; align-items: center; }
.typing-dots span {
  width: 6px; height: 6px;
  background: var(--text-dim);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce { 0%, 60%, 100% { transform: translateY(0); opacity: 0.4; } 30% { transform: translateY(-4px); opacity: 1; } }

/* ─── Skill upload form ──────────────────────────────── */
.skill-upload-form {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-top: 8px;
  margin-bottom: 8px;
}
.upload-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.upload-tab {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 12px;
  padding: 6px 12px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.upload-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.upload-tab-content { display: flex; flex-direction: column; gap: 8px; }
.upload-input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text);
  font-size: 13px;
  outline: none;
  font-family: inherit;
}
.upload-input:focus { border-color: var(--accent); }
.upload-textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  color: var(--text);
  font-size: 12px;
  font-family: "SF Mono", Monaco, monospace;
  outline: none;
  min-height: 120px;
  resize: vertical;
  line-height: 1.5;
}
.upload-textarea:focus { border-color: var(--accent); }
.upload-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 4px; }
.small-btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.small-btn.primary:active { background: var(--accent-hover); }
.small-btn.primary:disabled { opacity: 0.4; }
.upload-hint { font-size: 11px; color: var(--text-dim); margin-bottom: 4px; }
.file-drop-zone {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}
.file-drop-zone:active { border-color: var(--accent); background: var(--accent-dim); }
.drop-zone-content { display: flex; flex-direction: column; align-items: center; gap: 6px; color: var(--text-dim); font-size: 12px; }
.file-name-display { color: var(--accent); font-weight: 600; word-break: break-all; }
.upload-status {
  margin-top: 8px;
  font-size: 12px;
  padding: 8px;
  border-radius: 6px;
}
.upload-status.success { background: var(--green-dim); color: var(--green); }
.upload-status.error { background: var(--red-dim); color: var(--red); }

/* Skill item with delete button */
.skill-item { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.skill-item-info { flex: 1; min-width: 0; }
.skill-delete-btn {
  background: none;
  border: none;
  color: var(--text-dimmer);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  flex-shrink: 0;
}
.skill-delete-btn:active { color: var(--red); background: var(--red-dim); }

/* ─── File delivery cards ────────────────────────────── */
.file-delivery {
  align-self: flex-start;
  max-width: 90%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: fadeIn 0.25s ease;
}
.file-delivery .file-icon { flex-shrink: 0; }
.file-delivery .file-info { flex: 1; min-width: 0; }
.file-delivery .file-name { font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-delivery .file-meta { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.file-delivery .file-download-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--green-dim);
  color: var(--green);
  border: 1px solid var(--green);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  flex-shrink: 0;
  transition: all 0.15s;
}
.file-delivery .file-download-btn:active { background: var(--green); color: #fff; }

/* ─── Input bar ──────────────────────────────────────── */
.input-bar {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}
#msg-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 10px 16px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  resize: none;
  outline: none;
  max-height: 120px;
  line-height: 1.4;
  transition: border-color 0.15s;
}
#msg-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
#msg-input::placeholder { color: var(--text-dimmer); }
#send-btn {
  background: var(--accent);
  border: none;
  border-radius: 50%;
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
}
#send-btn:active { background: var(--accent-hover); transform: scale(0.95); }
#send-btn:disabled { opacity: 0.3; }