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

:root {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --bg-hover: #2d3a4f;
  --text: #f1f5f9;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --danger: #ef4444;
  --human-bg: #6366f1;
  --assistant-bg: #1e293b;
  --radius: 12px;
  --radius-sm: 8px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

#app {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.screen {
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* ─── Login ──────────────────────────────────────────────────────── */
.login-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  gap: 1rem;
}

.logo {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.login-subtitle { color: var(--text-dim); font-size: 0.95rem; }

#login-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  max-width: 320px;
}

#login-form input {
  padding: 0.85rem 1rem;
  border: 1px solid var(--bg-input);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

#login-form input:focus { border-color: var(--accent); }

#login-form button {
  padding: 0.85rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

#login-form button:hover { background: var(--accent-hover); }

.error-text { color: var(--danger); font-size: 0.85rem; text-align: center; }

/* ─── Top Bar ────────────────────────────────────────────────────── */
.top-bar {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  padding-top: calc(0.75rem + var(--safe-top));
  background: var(--bg-card);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  gap: 0.5rem;
  min-height: 56px;
  flex-shrink: 0;
}

.top-title { font-size: 1.3rem; font-weight: 700; flex: 1; }

.icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}

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

.back-btn { font-size: 1.4rem; }

.session-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.session-title {
  font-weight: 600;
  font-size: 1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-status {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.session-actions { display: flex; gap: 0.25rem; }

/* ─── Session List ───────────────────────────────────────────────── */
.session-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  -webkit-overflow-scrolling: touch;
  padding-bottom: calc(0.75rem + var(--safe-bottom));
}

.session-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  border: 1px solid rgba(255,255,255,0.04);
}

.session-card:active { transform: scale(0.98); }
.session-card:hover { background: var(--bg-hover); }

.session-dot {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: white;
  flex-shrink: 0;
}

.session-card-info {
  flex: 1;
  min-width: 0;
}

.session-card-name {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-card-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.session-card-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}

.session-card-status.active { background: #22c55e; }

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: 0.75rem;
  padding: 2rem;
  text-align: center;
}

.empty-state-icon { font-size: 3rem; opacity: 0.5; }
.empty-state p { font-size: 0.95rem; }

/* ─── Modal ──────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 1.5rem;
  width: 100%;
  max-width: 500px;
  max-height: 85vh;
  overflow-y: auto;
  padding-bottom: calc(1.5rem + var(--safe-bottom));
}

.modal h2 { font-size: 1.2rem; margin-bottom: 1rem; }

.modal label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.modal input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--bg-input);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.modal input:focus { border-color: var(--accent); }

.color-picker {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.4rem;
  flex-wrap: wrap;
}

.color-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.1s;
}

.color-dot:active { transform: scale(0.9); }
.color-dot.active { border-color: white; }

.modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn-primary, .btn-secondary {
  flex: 1;
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

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

/* ─── Chat View ──────────────────────────────────────────────────── */
.chat-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.chat-bubble {
  max-width: 88%;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.5;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.chat-bubble.human {
  align-self: flex-end;
  background: var(--human-bg);
  color: white;
  border-bottom-right-radius: 4px;
}

.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--assistant-bg);
  color: var(--text);
  border-bottom-left-radius: 4px;
  border: 1px solid rgba(255,255,255,0.06);
}

.chat-bubble.system {
  align-self: center;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
  padding: 0.3rem 0.6rem;
}

.chat-input-area {
  padding: 0.5rem 0.75rem;
  padding-bottom: calc(0.5rem + var(--safe-bottom));
  background: var(--bg-card);
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}

.chat-input-row {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

#chat-input, #terminal-input {
  flex: 1;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--bg-input);
  border-radius: 20px;
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  resize: none;
  max-height: 120px;
  font-family: inherit;
  line-height: 1.4;
  transition: border-color 0.2s;
}

#terminal-input {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

#chat-input:focus, #terminal-input:focus { border-color: var(--accent); }

.send-btn {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s;
}

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

.chat-shortcuts {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.1rem;
}

.shortcut-btn {
  padding: 0.3rem 0.65rem;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-family: 'SF Mono', monospace;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
  flex-shrink: 0;
}

.shortcut-btn:hover, .shortcut-btn:active { background: var(--bg-hover); }

/* ─── Terminal View ──────────────────────────────────────────────── */
.terminal-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.terminal-output {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  font-size: 0.78rem;
  line-height: 1.3;
  white-space: pre-wrap;
  word-break: break-all;
  background: #0c0c0c;
  color: #e0e0e0;
  -webkit-overflow-scrolling: touch;
}

.terminal-input-area {
  padding: 0.5rem 0.75rem;
  padding-bottom: calc(0.5rem + var(--safe-bottom));
  background: var(--bg-card);
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}

/* ─── Notes Panel ────────────────────────────────────────────────── */
.notes-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 400px;
  background: var(--bg);
  z-index: 50;
  display: flex;
  flex-direction: column;
  border-left: 1px solid rgba(255,255,255,0.06);
  animation: slideIn 0.2s ease-out;
}

@keyframes slideIn {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

.notes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  padding-top: calc(0.75rem + var(--safe-top));
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.notes-header h2 { font-size: 1.1rem; }

.notes-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.note-card {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  border: 1px solid rgba(255,255,255,0.04);
  position: relative;
}

.note-content {
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.note-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.note-delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  transition: color 0.2s;
}

.note-delete:hover { color: var(--danger); }

.notes-input-area {
  padding: 0.75rem;
  padding-bottom: calc(0.75rem + var(--safe-bottom));
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

#note-input {
  flex: 1;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--bg-input);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  resize: none;
  font-family: inherit;
  line-height: 1.4;
  transition: border-color 0.2s;
}

#note-input:focus { border-color: var(--accent); }

.notes-input-area .btn-primary {
  flex: 0;
  padding: 0.6rem 1rem;
  white-space: nowrap;
}

/* ─── Tool & Thinking Bubbles ─────────────────────────────────────── */
.chat-bubble.tool {
  align-self: flex-start;
  background: rgba(30, 41, 59, 0.6);
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  border: 1px solid rgba(255,255,255,0.04);
  max-width: 95%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-bubble.tool-use .tool-icon {
  margin-right: 0.3rem;
}

.chat-bubble.tool-result {
  white-space: normal;
}

.tool-result-stats {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.tool-detail {
  margin-top: 0.35rem;
}

.tool-detail summary {
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--accent);
  user-select: none;
}

.tool-detail summary:hover {
  color: var(--accent-hover);
}

.tool-detail pre {
  margin-top: 0.3rem;
  padding: 0.5rem;
  background: rgba(0,0,0,0.3);
  border-radius: 4px;
  font-size: 0.72rem;
  line-height: 1.35;
  overflow-x: auto;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-dim);
}

.chat-bubble.thinking {
  align-self: flex-start;
  background: transparent;
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.82rem;
  padding: 0.25rem 0.6rem;
  opacity: 0.7;
  max-width: 95%;
  border: none;
}

.chat-bubble.thinking details summary {
  cursor: pointer;
  user-select: none;
}

.chat-bubble.thinking .thinking-content {
  margin-top: 0.3rem;
  font-style: normal;
  color: var(--text-dim);
  font-size: 0.78rem;
  line-height: 1.5;
  max-height: 200px;
  overflow-y: auto;
}

/* ─── Markdown in chat bubbles ────────────────────────────────────── */
.chat-bubble pre {
  background: rgba(0,0,0,0.3);
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  margin: 0.3rem 0;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-all;
}

.chat-bubble pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.chat-bubble code {
  background: rgba(0,0,0,0.25);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.84em;
}

.chat-bubble strong {
  font-weight: 700;
}

/* ─── Loading / Utility ──────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--text-muted);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.hidden { display: none !important; }

/* ─── Scrollbar ──────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

/* ─── Desktop tweaks ─────────────────────────────────────────────── */
@media (min-width: 768px) {
  .session-list {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

  .modal {
    border-radius: var(--radius);
    margin-bottom: 2rem;
  }

  .modal-overlay {
    align-items: center;
  }

  .chat-bubble { max-width: 70%; }

  .notes-panel { max-width: 400px; }
}