/* ============================================
   Waled Claude — Design Tokens
   Palette: near-black / near-white duality with one signal color (amber)
   Type: Söhne-like system sans for chat, JetBrains-style mono for data
   ============================================ */

:root {
  --accent: #d97a3f;        /* amber-terracotta signal — used sparingly */
  --accent-dim: #d97a3f33;

  /* dark theme (default) */
  --bg: #0e0e0f;
  --bg-elevated: #161617;
  --bg-hover: #1e1e20;
  --border: #2a2a2d;
  --text: #e8e6e2;
  --text-dim: #8a8884;
  --text-faint: #55534f;
  --bubble-user: #1e1e20;
  --bubble-assistant: transparent;
}

[data-theme="light"] {
  --bg: #faf9f7;
  --bg-elevated: #ffffff;
  --bg-hover: #f0eee9;
  --border: #e3e0da;
  --text: #1c1b19;
  --text-dim: #75726c;
  --text-faint: #a8a49c;
  --bubble-user: #f0eee9;
  --bubble-assistant: transparent;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: "SF Mono", "JetBrains Mono", "Roboto Mono", monospace;
}

button { font-family: inherit; cursor: pointer; }
textarea { font-family: inherit; }

/* ============ Layout ============ */

.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

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

/* ============ Sidebar ============ */

.sidebar {
  width: 264px;
  flex-shrink: 0;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease;
}

.sidebar-header {
  padding: 14px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.new-chat-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13.5px;
  transition: background 0.15s, border-color 0.15s;
}
.new-chat-btn:hover { background: var(--bg-hover); border-color: var(--accent); }
.new-chat-btn .plus { color: var(--accent); font-weight: 600; font-size: 16px; }

.sidebar-close { display: none; background: none; border: none; color: var(--text-dim); font-size: 22px; padding: 0 6px; }

.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.conv-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 9px 10px;
  border-radius: 7px;
  font-size: 13.5px;
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  margin-bottom: 2px;
}
.conv-item:hover { background: var(--bg-hover); color: var(--text); }
.conv-item.active { background: var(--bg-hover); color: var(--text); }
.conv-item.active::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-right: 6px;
}
.conv-title { overflow: hidden; text-overflow: ellipsis; flex: 1; }
.conv-delete { opacity: 0; background: none; border: none; color: var(--text-faint); font-size: 15px; padding: 2px 4px; }
.conv-item:hover .conv-delete { opacity: 1; }
.conv-delete:hover { color: var(--accent); }

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}
.brand-mark {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9;
}

/* ============ Topbar ============ */

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: 6px;
}
.menu-btn span { width: 18px; height: 1.5px; background: var(--text-dim); display: block; }

.usage-meter {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 100px;
}
.usage-divider { color: var(--text-faint); }
.usage-cost { color: var(--accent); }

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.model-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 8px;
  appearance: none;
  font-family: "SF Mono", "JetBrains Mono", monospace;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim);
}
.theme-toggle svg { width: 16px; height: 16px; }
.icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: block; }

/* ============ Chat area ============ */

.chat-area {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  gap: 10px;
}
.empty-mark {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 13px;
  letter-spacing: 0.15em;
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 8px;
  color: var(--text-dim);
}
.empty-state.hidden { display: none; }

.messages {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.msg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 100%;
}
.msg.user { align-items: flex-end; }
.msg.assistant { align-items: flex-start; }

.msg-bubble {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 15px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.msg.user .msg-bubble {
  background: var(--bubble-user);
  border-radius: 14px 14px 4px 14px;
  max-width: 80%;
}
.msg.assistant .msg-bubble {
  background: var(--bubble-assistant);
  padding-left: 0;
  max-width: 100%;
}

.msg-meta {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 10.5px;
  color: var(--text-faint);
  padding: 0 4px;
}

.msg-attachments {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.msg-attachment-chip {
  font-size: 11px;
  font-family: "SF Mono", "JetBrains Mono", monospace;
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 6px;
  color: var(--text-dim);
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 10px 0;
}
.typing-indicator span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-faint);
  animation: pulse 1.2s infinite ease-in-out;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse { 0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); } 40% { opacity: 1; transform: scale(1); } }

/* ============ Composer ============ */

.composer {
  padding: 14px 20px 18px;
  flex-shrink: 0;
}

.attachment-preview {
  max-width: 760px;
  margin: 0 auto 8px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.attachment-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 5px 9px;
  border-radius: 7px;
  font-size: 12px;
  color: var(--text-dim);
}
.attachment-chip button {
  background: none; border: none; color: var(--text-faint); font-size: 13px; padding: 0;
}

.composer-form {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 8px 8px 8px 12px;
}
.composer-form:focus-within { border-color: var(--accent); }

.attach-btn, .send-btn {
  background: none;
  border: none;
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
  color: var(--text-dim);
  flex-shrink: 0;
}
.attach-btn svg, .send-btn svg { width: 18px; height: 18px; }
.attach-btn:hover { background: var(--bg-hover); color: var(--text); }

.send-btn {
  background: var(--accent);
  color: #fff;
}
.send-btn:disabled { background: var(--border); color: var(--text-faint); cursor: not-allowed; }

#messageInput {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 15px;
  resize: none;
  max-height: 200px;
  padding: 7px 0;
  line-height: 1.4;
}
#messageInput::placeholder { color: var(--text-faint); }

/* ============ Mode tabs ============ */

.mode-tabs {
  display: flex;
  gap: 2px;
  padding: 10px 12px 6px;
  border-bottom: 1px solid var(--border);
}
.mode-tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 12.5px;
  padding: 7px 0;
  border-radius: 6px;
  font-family: "SF Mono", "JetBrains Mono", monospace;
  letter-spacing: 0.02em;
}
.mode-tab:hover { background: var(--bg-hover); }
.mode-tab.active { background: var(--bg-hover); color: var(--accent); }

/* ============ Task list (sidebar) ============ */

.task-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.task-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 9px 10px;
  border-radius: 7px;
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
  margin-bottom: 2px;
}
.task-item:hover { background: var(--bg-hover); color: var(--text); }
.task-item-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.task-item-status {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 9.5px;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}
.task-item-status.running, .task-item-status.pending { background: var(--accent-dim); color: var(--accent); }
.task-item-status.done { background: #2d6a4f33; color: #52b788; }
.task-item-status.failed { background: #e6394633; color: #ff6b6b; }

/* ============ Task panel (main area) ============ */

.task-area {
  flex: 1;
  overflow-y: auto;
  display: flex;
  justify-content: center;
  padding: 30px 20px 60px;
}

.task-new, .task-progress {
  max-width: 640px;
  width: 100%;
}

.task-new h2, .task-progress h2 {
  font-size: 19px;
  margin: 0 0 6px;
  font-weight: 600;
}
.task-hint {
  color: var(--text-dim);
  font-size: 13.5px;
  margin: 0 0 18px;
  line-height: 1.5;
}

#taskGoalInput {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-size: 14.5px;
  padding: 12px 14px;
  resize: vertical;
  font-family: inherit;
  margin-bottom: 14px;
}
#taskGoalInput:focus { outline: none; border-color: var(--accent); }

.task-options {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.task-option-label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 11.5px;
  color: var(--text-faint);
  font-family: "SF Mono", "JetBrains Mono", monospace;
  flex: 1;
  min-width: 160px;
}
.task-option-label select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-family: inherit;
}

.task-attach-row { margin-bottom: 10px; }
.task-attach-row .attach-btn {
  width: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
}
.task-attach-row .attach-btn:hover { background: var(--bg-hover); color: var(--text); }
.task-attach-row .attach-btn svg { width: 15px; height: 15px; }

.task-start-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  margin-top: 8px;
}
.task-start-btn:hover { opacity: 0.9; }
.task-start-btn:disabled { background: var(--border); color: var(--text-faint); cursor: not-allowed; }

.task-progress-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}
.task-status-badge {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 10.5px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
  flex-shrink: 0;
  letter-spacing: 0.04em;
}
.task-status-badge.done { background: #2d6a4f33; color: #52b788; }
.task-status-badge.failed { background: #e6394633; color: #ff6b6b; }

.task-steps {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 20px;
}
.task-step {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.task-step-num {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--text-faint);
  flex-shrink: 0;
  width: 24px;
  padding-top: 2px;
}
.task-step-body { flex: 1; }
.task-step-action {
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 10.5px;
  text-transform: uppercase;
  color: var(--accent);
  letter-spacing: 0.04em;
  display: block;
  margin-bottom: 3px;
}
.task-step-desc {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.5;
}

.task-output { margin-bottom: 16px; }
.task-download-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 11px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
}
.task-download-btn:hover { opacity: 0.9; }

.task-new-btn-secondary {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
}
.task-new-btn-secondary:hover { background: var(--bg-hover); color: var(--text); }

@media (max-width: 768px) {
  .task-options { flex-direction: column; }
  .task-area { padding: 18px 14px 40px; }
}

/* ============ Responsive ============ */

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    z-index: 10;
    height: 100%;
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.show { display: block; }
  .sidebar-close { display: block; }
  .menu-btn { display: flex; }
  .usage-meter { font-size: 10.5px; padding: 4px 8px; }
  .model-select { font-size: 11.5px; padding: 5px 6px; }
  .messages { padding: 14px 14px 30px; }
  .msg.user .msg-bubble { max-width: 90%; }
}