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

:root {
  --bg: #0f0f0f;
  --bg2: #161616;
  --bg3: #1e1e1e;
  --border: #2a2a2a;
  --text: #d4d4d4;
  --muted: #666;
  --green: #7fff7f;
  --blue: #7fbfff;
  --red: #ff7f7f;
  --yellow: #ffdf7f;
  --font: 'Courier New', Courier, monospace;
}

html, body { height: 100%; overflow: hidden; }

body {
  font-family: var(--font);
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  display: flex;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  font-family: var(--font);
  font-size: 12px;
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 4px 10px;
  cursor: pointer;
  border-radius: 2px;
}
button:hover { background: #2a2a2a; }
button.primary { background: #1a2a1a; color: var(--green); border-color: #3a5a3a; }
button.primary:hover { background: #223022; }
button.danger { color: var(--red); border-color: #5a2a2a; }
button.danger:hover { background: #2a1a1a; }
button.ghost { background: transparent; border-color: transparent; color: var(--muted); }
button.ghost:hover { color: var(--text); background: var(--bg3); border-color: var(--border); }

input, textarea, select {
  font-family: var(--font);
  font-size: 13px;
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 8px;
  outline: none;
  border-radius: 2px;
  width: 100%;
}
input:focus, textarea:focus, select:focus { border-color: #444; }

/* Layout */
#app { display: flex; width: 100%; height: 100%; }

#sidebar {
  width: 220px;
  min-width: 220px;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.sidebar-header span { color: var(--green); font-weight: bold; font-size: 14px; }

#thread-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}

.thread-item {
  padding: 8px 12px;
  cursor: pointer;
  border-left: 2px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--muted);
  font-size: 12px;
}
.thread-item:hover { background: var(--bg3); color: var(--text); }
.thread-item.active { border-left-color: var(--green); color: var(--text); background: var(--bg3); }
.thread-item.pinned { color: var(--yellow); }

.sidebar-footer {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 6px;
  align-items: center;
}
.sidebar-footer .nav-btn {
  flex: 1;
  text-align: center;
  font-size: 11px;
  padding: 4px 6px;
}
.sidebar-footer .nav-btn.active { color: var(--green); border-color: #3a5a3a; }

#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Views */
.view { display: none; flex: 1; flex-direction: column; overflow: hidden; }
.view.active { display: flex; }

/* Chat view */
#chat-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
#chat-title {
  flex: 1;
  font-size: 13px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#chat-title input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 2px 0;
  font-size: 13px;
}

#messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message { display: flex; flex-direction: column; gap: 4px; max-width: 90%; }
.message.user { align-self: flex-end; align-items: flex-end; }
.message.assistant { align-self: flex-start; }

.message-label { font-size: 10px; color: var(--muted); }
.message.user .message-label { color: var(--blue); }
.message.assistant .message-label { color: var(--green); }

.message-body {
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 2px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}
.message.user .message-body { border-color: #2a3a4a; }
.message.assistant .message-body { border-color: #2a3a2a; }

.message-body.streaming::after {
  content: '▊';
  animation: blink 1s step-end infinite;
  color: var(--green);
}
@keyframes blink { 50% { opacity: 0; } }

/* Markdown basics */
.message-body code {
  background: var(--bg2);
  padding: 1px 4px;
  border-radius: 2px;
  font-size: 12px;
}
.message-body pre {
  background: var(--bg2);
  padding: 8px;
  border-radius: 2px;
  overflow-x: auto;
  margin: 6px 0;
}
.message-body pre code { background: none; padding: 0; }
.message-body h1, .message-body h2, .message-body h3 { color: var(--green); margin: 8px 0 4px; }
.message-body ul, .message-body ol { padding-left: 20px; }
.message-body li { margin: 2px 0; }
.message-body p { margin: 4px 0; }
.message-body strong { color: var(--text); }
.message-body em { color: var(--muted); }
.message-body hr { border: none; border-top: 1px solid var(--border); margin: 8px 0; }
.message-body blockquote { border-left: 2px solid var(--border); padding-left: 8px; color: var(--muted); }

#composer {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  gap: 8px;
  align-items: flex-end;
}
#composer textarea {
  flex: 1;
  resize: none;
  min-height: 40px;
  max-height: 160px;
  overflow-y: auto;
}
#send-btn { align-self: flex-end; }

/* Files view */
#files-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
#file-breadcrumb { flex: 1; color: var(--muted); font-size: 12px; }
#file-breadcrumb span { cursor: pointer; }
#file-breadcrumb span:hover { color: var(--text); }

#file-list { flex: 1; overflow-y: auto; padding: 8px 0; }
.file-item {
  padding: 7px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}
.file-item:hover { background: var(--bg3); color: var(--text); }
.file-item.dir { color: var(--blue); }
.file-item .file-icon { width: 14px; }
.file-item .file-size { margin-left: auto; color: var(--muted); font-size: 11px; }

#file-editor {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
#file-editor-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
#file-editor-path { flex: 1; color: var(--muted); font-size: 12px; }
#file-editor-content { flex: 1; resize: none; border: none; border-radius: 0; padding: 12px 16px; font-size: 13px; }

/* Tasks view */
#tasks-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--green);
}
#task-form {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.task-form-row { display: flex; gap: 8px; }
.task-form-row input, .task-form-row select { flex: 1; }
.task-form-label { font-size: 11px; color: var(--muted); margin-bottom: 2px; }

#task-list { flex: 1; overflow-y: auto; padding: 8px 0; }
.task-item {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.task-item-header { display: flex; align-items: center; gap: 8px; }
.task-item-title { flex: 1; font-size: 13px; }
.task-item-meta { font-size: 11px; color: var(--muted); }
.task-item.inactive { opacity: 0.5; }

/* Empty state */
.empty { text-align: center; color: var(--muted); padding: 40px 20px; font-size: 12px; }

/* Login screen */
#login-screen {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.login-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 32px;
  width: 300px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.login-box h2 { color: var(--green); font-size: 16px; }
.login-error { color: var(--red); font-size: 12px; display: none; }

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }

/* Sidebar toggle */
#sidebar-toggle { display: block; }
#sidebar.collapsed { display: none; }

@media (max-width: 768px) {
  button { padding: 8px 14px; font-size: 13px; }
  .sidebar-footer .nav-btn { padding: 10px 6px; font-size: 12px; }
  input, textarea, select { padding: 10px; font-size: 15px; }
  .login-box { width: calc(100% - 32px); padding: 24px; }
  .task-form-row { flex-direction: column; }
  #composer { padding: 10px 12px; }
  #composer textarea { min-height: 48px; font-size: 15px; }
  #send-btn { padding: 10px 16px; }
}
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }