/* ─── CSS Custom Properties (Dark Theme) ───────────────────── */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-elevated: #1c2128;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-dim: #484f58;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --success: #3fb950;
  --danger: #f85149;
  --warning: #d29922;
  --border: #30363d;
  --border-light: #21262d;
  --thinking-bg: #0d1117;
  --thinking-border: #30363d;
  --tool-call-bg: #1c2128;
  --tool-call-border: #30363d;
  --user-bubble-bg: #1f6feb33;
  --assistant-bubble-bg: transparent;
  --code-bg: #151b23;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --radius: 8px;
  --radius-sm: 4px;
  --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* ─── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  touch-action: manipulation;
}

body {
  display: flex;
  flex-direction: column;
}

/* ─── Status Bar ───────────────────────────────────────────── */
.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
  transition: background 0.3s ease;
  padding-top: max(6px, env(safe-area-inset-top, 6px));
}

.status-connected {
  background: #1a3a2a;
  color: var(--success);
}

.status-disconnected {
  background: #3a1a1a;
  color: var(--danger);
}

.status-connecting {
  background: #2a2a1a;
  color: var(--warning);
}

#status-details {
  font-size: 11px;
  opacity: 0.8;
}

/* ─── Reconnect Banner ─────────────────────────────────────── */
.reconnect-banner {
  flex-shrink: 0;
  background: #3a2a00;
  color: var(--warning);
  text-align: center;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: background 0.3s;
}

.reconnect-banner:hover {
  background: #4a3a00;
}

.reconnect-banner.hidden {
  display: none;
}

/* ─── Task Selector ───────────────────────────────────────── */
.task-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.task-selector.hidden {
  display: none;
}

.task-selector select {
  flex: 1;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  font-size: 12px;
  font-family: var(--font-sans);
  cursor: pointer;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.task-selector select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn-small {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 14px;
  cursor: pointer;
  flex-shrink: 0;
  line-height: 1;
}

.btn-small:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

/* ─── App Container ────────────────────────────────────────── */
.app-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* ─── Chat Messages ────────────────────────────────────────── */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 12px 12px 8px;
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* ─── Message Bubbles ──────────────────────────────────────── */
.message {
  padding: 8px 12px;
  margin-bottom: 8px;
  border-radius: var(--radius);
  max-width: 100%;
  word-wrap: break-word;
  overflow-wrap: break-word;
  animation: messageIn 0.2s ease-out;
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-user {
  background: var(--user-bubble-bg);
  border: 1px solid var(--border);
  align-self: flex-end;
}

.message-assistant {
  background: var(--assistant-bubble-bg);
  border: none;
  padding-left: 0;
}

.message-header {
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.message-content {
  white-space: pre-wrap;
  line-height: 1.6;
}

.message-content p {
  margin-bottom: 8px;
}

.message-content p:last-child {
  margin-bottom: 0;
}

/* ─── Thinking / Reasoning Block ───────────────────────────── */
.thinking-block {
  margin: 8px 0;
  border: 1px solid var(--thinking-border);
  border-radius: var(--radius);
  background: var(--thinking-bg);
  overflow: hidden;
}

.thinking-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  background: var(--bg-secondary);
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  transition: color 0.15s;
}

.thinking-toggle:hover {
  color: var(--text-secondary);
}

.thinking-toggle .arrow {
  transition: transform 0.2s;
  font-size: 10px;
}

.thinking-toggle .arrow.expanded {
  transform: rotate(90deg);
}

.thinking-content {
  display: none;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
  white-space: pre-wrap;
  font-family: var(--font-mono);
  max-height: 300px;
  overflow-y: auto;
}

.thinking-content.expanded {
  display: block;
}

/* ─── Tool Call Item ───────────────────────────────────────── */
.tool-call {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  margin: 4px 0;
  background: var(--tool-call-bg);
  border: 1px solid var(--tool-call-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-mono);
  transition: opacity 0.3s;
}

.tool-call .tool-icon {
  flex-shrink: 0;
  font-size: 14px;
}

.tool-call .tool-name {
  color: var(--accent);
  font-weight: 500;
  flex-shrink: 0;
}

.tool-call .tool-input {
  color: var(--text-secondary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tool-call .tool-status {
  flex-shrink: 0;
  font-size: 12px;
}

.tool-call .tool-status.running {
  color: var(--warning);
  animation: pulse 1s infinite;
}

.tool-call .tool-status.success {
  color: var(--success);
}

.tool-call .tool-status.error {
  color: var(--danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ─── API Request ──────────────────────────────────────────── */
.api-request {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  margin: 2px 0;
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

/* ─── Subtask ──────────────────────────────────────────────── */
.tool-call.subtask {
  background: var(--bg-tertiary);
  border-color: var(--border-light);
  opacity: 0.85;
}

/* ─── Code Blocks ──────────────────────────────────────────── */
.code-block {
  margin: 8px 0;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-secondary);
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.copy-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.copy-btn.copied {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.code-content {
  padding: 10px 12px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  white-space: pre;
}

/* ─── Loading Overlay ──────────────────────────────────────── */
.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 10;
  gap: 16px;
}

.loading-overlay.hidden {
  display: none;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ─── Input Area ───────────────────────────────────────────── */
.input-area {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 8px 12px;
  padding-bottom: max(8px, var(--safe-bottom));
}

.input-controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-row {
  display: flex;
  gap: 6px;
  align-items: flex-end;
}

.select-input {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.select-input:focus {
  outline: none;
  border-color: var(--accent);
}

.prompt-input {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  resize: none;
  line-height: 1.4;
  min-height: 40px;
  max-height: 120px;
}

.prompt-input:focus {
  outline: none;
  border-color: var(--accent);
}

.prompt-input::placeholder {
  color: var(--text-dim);
}

/* ─── Buttons ──────────────────────────────────────────────── */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 18px;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
  font-family: inherit;
  line-height: 1;
}

.btn:active {
  transform: scale(0.95);
}

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.btn-danger:hover {
  opacity: 0.9;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
}

.btn.hidden {
  display: none;
}

/* ─── Model Info Bar ───────────────────────────────────────── */
.model-info {
  flex-shrink: 0;
  padding: 4px 12px;
  padding-bottom: max(4px, var(--safe-bottom));
  font-size: 11px;
  color: var(--text-dim);
  background: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  text-align: center;
}

/* ─── Scroll to Bottom Button ──────────────────────────────── */
.scroll-bottom-btn {
  position: absolute;
  bottom: 8px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  z-index: 5;
}

.scroll-bottom-btn.visible {
  display: flex;
}

/* ─── Utility ──────────────────────────────────────────────── */
.hidden {
  display: none !important;
}

/* ─── Responsive ───────────────────────────────────────────── */
@media (max-width: 480px) {
  .chat-messages {
    padding: 8px 8px 4px;
  }

  .message {
    padding: 6px 10px;
    font-size: 15px;
  }

  .input-area {
    padding: 6px 8px;
  }

  .select-input {
    font-size: 13px;
    padding: 6px 8px;
  }

  .prompt-input {
    font-size: 15px;
    padding: 6px 10px;
    min-height: 36px;
  }

  .btn {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

  .model-info {
    font-size: 10px;
  }
}

/* ─── Shake animation for error ────────────────────────────── */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.shake {
  animation: shake 0.3s ease-in-out;
}