:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --user-bg: #1f6feb22;
  --assistant-bg: #161b22;
  --tool-bg: #2d1117;
  --think-bg: #1a2332;
  --danger: #f85149;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, "Segoe UI", sans-serif;
  font-size: 15px;
}

body {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

#sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

#sidebar-backdrop {
  display: none;
}

#menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 18px;
  line-height: 1;
  padding: 4px 10px;
  margin-right: 8px;
}

@media (max-width: 768px) {
  #menu-btn {
    display: inline-flex;
  }

  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 260px;
    z-index: 200;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }

  #sidebar.open {
    transform: translateX(0);
  }

  #sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 150;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
  }

  #sidebar-backdrop.active {
    opacity: 1;
    pointer-events: auto;
  }

  header {
    gap: 8px;
    padding: 8px 10px;
  }

  header h1 {
    font-size: 15px;
  }

  .controls {
    gap: 6px;
  }

  .controls label[for="model-select"],
  .think-toggle span {
    display: none;
  }

  select#model-select {
    max-width: 120px;
  }

  .input-row {
    flex-wrap: nowrap;
    gap: 6px;
  }

  .attach-btn {
    width: 34px;
    height: 34px;
    font-size: 16px;
    order: 1;
    flex-shrink: 0;
  }

  textarea#input {
    order: 2;
    min-width: 0;
    padding: 0 8px;
    font-size: 14px;
    height: 34px;
    line-height: 34px;
    resize: none;
  }

  button#send-btn,
  #cancel-btn {
    order: 3;
    padding: 0 10px;
    font-size: 13px;
    height: 34px;
    flex-shrink: 0;
  }
}

@media (max-width: 520px) {
  header {
    flex-wrap: wrap;
    padding: 8px;
    gap: 6px;
  }

  header h1 {
    font-size: 14px;
    order: 1;
  }

  #menu-btn {
    order: 0;
  }

  .controls {
    order: 2;
    width: 100%;
    margin-left: 0;
    justify-content: space-between;
  }

  select#model-select {
    flex: 1;
    max-width: none;
  }

  .think-toggle {
    font-size: 13px;
  }

  #clear-btn {
    font-size: 12px;
    padding: 4px 6px;
  }
}

@media (max-width: 360px) {
  .controls {
    flex-wrap: wrap;
    gap: 4px;
  }

  select#model-select {
    width: 100%;
    order: 0;
  }

  .think-toggle {
    order: 1;
  }

  #clear-btn {
    order: 2;
    margin-left: auto;
  }
}

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

.sidebar-header h2 {
  font-size: 15px;
  margin: 0;
  color: var(--muted);
}

.sidebar-header button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--accent);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 2px 8px;
}

.sidebar-header button:hover {
  border-color: var(--accent);
}

#session-list {
  list-style: none;
  margin: 0;
  padding: 8px;
  overflow-y: auto;
  flex: 1;
}

#session-list li {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 4px;
}

#session-list li:hover {
  background: #21262d;
}

#session-list li.active {
  background: #1f6feb33;
  border: 1px solid var(--accent);
}

#session-list li .title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 14px;
}

#session-list li .delete {
  display: none;
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 4px;
}

#session-list li:hover .delete {
  display: inline;
}

#session-list li.empty {
  color: var(--muted);
  font-size: 13px;
  cursor: default;
}

#session-list li.empty:hover {
  background: transparent;
}

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

header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 18px;
  margin: 0;
}

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  min-width: 0;
}

select#model-select {
  max-width: 220px;
  min-width: 0;
}

select, button, input[type="checkbox"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 14px;
}

button { cursor: pointer; }
button:hover { border-color: var(--accent); }

.think-toggle { display: flex; align-items: center; gap: 4px; color: var(--muted); }
.think-toggle.disabled,
.think-toggle:has(input:disabled) {
  color: var(--muted);
  opacity: 0.5;
  cursor: not-allowed;
}
.think-toggle.disabled input[type="checkbox"],
.think-toggle:has(input:disabled) input[type="checkbox"] {
  cursor: not-allowed;
}

main#chat {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  line-height: 1.6;
}

.message.user { background: var(--user-bg); }
.message.assistant { background: var(--assistant-bg); }
.message .role { font-weight: 600; margin-bottom: 6px; color: var(--muted); }

.message pre {
  background: #010409;
  border-radius: 8px;
  padding: 10px;
  overflow-x: auto;
}

.message code { font-family: "SFMono-Regular", Consolas, monospace; font-size: 13px; }

.message .math-block {
  margin: 12px 0;
  overflow-x: auto;
}

.message .math-inline {
  display: inline-block;
}
.message p { margin: 8px 0; }
.message ul, .message ol { padding-left: 22px; }

.message .extras {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.message .extras details {
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 13px;
  color: var(--muted);
}

.message .extras details summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
}

.message .extras details .args,
.message .extras details .result {
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 6px;
}

.message .extras details.tool {
  background: var(--tool-bg);
  border-style: dashed;
}

.message .extras details.thinking {
  background: var(--think-bg);
}

#attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px 16px 0;
  background: var(--panel);
  border-top: 1px solid var(--border);
  min-height: 0;
}

#attachments:empty {
  display: none;
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 13px;
}

.attachment-chip .remove {
  cursor: pointer;
  color: var(--danger);
  font-weight: 600;
}

form#input-form {
  padding: 12px 16px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

.input-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.attach-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 20px;
}

.attach-btn:hover { border-color: var(--accent); }

.attach-btn input[type="file"] {
  display: none;
}

textarea#input {
  flex: 1;
  resize: none;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  font-size: 15px;
  font-family: inherit;
}

button#send-btn { padding: 0 20px; }

.login-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

.login-shell {
  width: min(360px, calc(100vw - 32px));
}

.login-form {
  display: grid;
  gap: 12px;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.login-form h1 {
  margin: 0 0 8px;
  font-size: 20px;
}

.login-form input {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  font-size: 16px;
}

.login-form p {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
}

/* MCP settings */
.sidebar-footer {
  padding: 10px 14px;
  border-top: 1px solid var(--border);
}

.sidebar-footer button {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  cursor: pointer;
  font-size: 14px;
}

.sidebar-footer button:hover {
  border-color: var(--accent);
}

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 300;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal.open {
  display: flex;
}

.modal-content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: min(720px, 100%);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  margin: 0;
  font-size: 16px;
}

.modal-header .close-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 22px;
  cursor: pointer;
  line-height: 1;
}

.modal-header .close-btn:hover {
  color: var(--text);
}

.modal-body {
  padding: 16px;
  overflow-y: auto;
  flex: 1;
}

.modal-help {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.modal-help code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 4px;
  font-size: 12px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  gap: 8px;
}

.modal-footer button {
  padding: 6px 16px;
}

.modal-footer button.secondary {
  background: transparent;
}

.mcp-server-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

.mcp-server-header {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.mcp-server-name {
  flex: 1;
}

.mcp-server-delete {
  background: transparent;
  color: var(--danger);
  border-color: var(--danger);
}

.mcp-server-delete:hover {
  border-color: var(--danger);
  background: rgba(248, 81, 73, 0.1);
}

.mcp-server-type {
  width: 100%;
  margin-bottom: 10px;
}

.mcp-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.mcp-field span {
  font-size: 13px;
  color: var(--muted);
}

.mcp-field input,
.mcp-field textarea {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font-size: 14px;
  font-family: inherit;
  width: 100%;
}

.mcp-field textarea {
  resize: vertical;
}

#mcp-add-btn {
  width: 100%;
  background: transparent;
}