:root {
  --panel: #f0f0f0;
  --panel-alt: #e4e4e4;
  --border: #b8b8b8;
  --ink: #1f1f1f;
  --accent: #8B5A2B;
  --accent-dark: #6f4622;
  --white: #ffffff;
}

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

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  color: var(--ink);
  background: var(--panel);
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* Menu bar */
.menubar {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 2px 4px;
  flex: 0 0 auto;
}

.menu { position: relative; display: inline-block; }

.menu-title {
  background: transparent;
  border: 1px solid transparent;
  padding: 4px 12px;
  font: inherit;
  cursor: pointer;
}

.menu-title:hover { background: var(--panel-alt); border-color: var(--border); }

.menu-items {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  z-index: 20;
  display: flex;
  flex-direction: column;
}

.menu-items button {
  background: transparent;
  border: 0;
  text-align: left;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
}

.menu-items button:hover { background: var(--panel-alt); }

/* Workspace */
.workspace {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
}

.sidebar {
  flex: 0 0 200px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.side-btn {
  height: 46px;
  font: inherit;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

.side-btn:hover { background: #dcdcdc; }
.side-btn:active { background: #d0d0d0; }
.side-btn:disabled { opacity: 0.55; cursor: default; }

.side-btn-exit { margin-top: auto; }

.content {
  flex: 1 1 auto;
  position: relative;
  min-width: 0;
  padding: 10px;
  display: flex;
}

.pane {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

#txtPrompt {
  flex: 0 0 110px;
  resize: none;
  padding: 8px;
  font: inherit;
  border: 1px solid var(--border);
  background: var(--white);
}

.send-btn {
  flex: 0 0 auto;
  height: 40px;
  font: inherit;
  color: var(--white);
  background: var(--accent);
  border: 1px solid var(--accent-dark);
  border-radius: 3px;
  cursor: pointer;
}

.send-btn:hover { background: var(--accent-dark); }
.send-btn:disabled { opacity: 0.6; cursor: default; }

.reply {
  flex: 1 1 auto;
  resize: none;
  padding: 10px;
  font-family: Consolas, 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  border: 1px solid var(--border);
  background: var(--white);
  white-space: pre-wrap;
}

/* Progress */
.progress {
  flex: 0 0 auto;
  height: 16px;
  border: 1px solid var(--border);
  background: var(--white);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 35%;
  background: var(--accent);
  animation: slide 1.1s linear infinite;
}

@keyframes slide {
  0% { margin-left: -35%; }
  100% { margin-left: 100%; }
}

/* Browser / preview pane */
.browser-toolbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.browser-toolbar button {
  font: inherit;
  padding: 6px 12px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

.browser-toolbar button:hover { background: #dcdcdc; }

.preview-nav { display: flex; gap: 6px; flex-wrap: wrap; }

.preview-nav button.active { background: var(--accent); color: var(--white); border-color: var(--accent-dark); }

#previewFrame {
  flex: 1 1 auto;
  width: 100%;
  border: 1px solid var(--border);
  background: var(--white);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px 24px;
  min-width: 380px;
  max-width: 560px;
}

.modal-card h2 { margin: 0 0 12px; font-size: 16px; }

.modal-body { font-family: Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.6; }
.modal-body .row { display: flex; justify-content: space-between; gap: 20px; }
.modal-body .ok { color: #1b7f3b; }
.modal-body .warn { color: #b3261e; }

.modal-card button {
  margin-top: 16px;
  font: inherit;
  padding: 6px 16px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

/* Login */
.login-body {
  align-items: center;
  justify-content: center;
  background: var(--panel-alt);
}

.login-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 28px 32px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.login-card h1 { margin: 0; font-size: 22px; color: var(--accent); }
.login-sub { margin: 0 0 8px; color: #666; }
.login-card label { font-size: 13px; }
.login-card input { padding: 8px; font: inherit; border: 1px solid var(--border); }
.login-card button {
  margin-top: 6px;
  padding: 9px;
  font: inherit;
  color: var(--white);
  background: var(--accent);
  border: 1px solid var(--accent-dark);
  border-radius: 3px;
  cursor: pointer;
}
.login-card button:hover { background: var(--accent-dark); }
.login-error { color: #b3261e; margin: 0; font-size: 13px; }

/* File manager pane */
.crumb {
  font-family: Consolas, 'Courier New', monospace;
  font-size: 13px;
  color: #555;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.files-status {
  flex: 0 0 auto;
  min-height: 18px;
  font-size: 13px;
  color: #444;
}

.files-list-wrap {
  flex: 1 1 auto;
  overflow: auto;
  border: 1px solid var(--border);
  background: var(--white);
}

.files-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.files-table th {
  position: sticky;
  top: 0;
  text-align: left;
  background: var(--panel-alt);
  border-bottom: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--accent);
}

.files-table td {
  padding: 6px 10px;
  border-bottom: 1px solid #eee;
  vertical-align: middle;
}

.files-table tr:hover td { background: #fafafa; }
.files-table td.size, .files-table td.modified { white-space: nowrap; color: #555; }
.files-table td.actions { text-align: right; white-space: nowrap; }
.files-table button {
  font: inherit;
  font-size: 12px;
  padding: 3px 8px;
  margin-left: 4px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}
.files-table button:hover { background: #dcdcdc; }
.files-name { cursor: pointer; color: var(--accent); }
.files-name.dir { font-weight: 600; }

.file-editor {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 0;
}

.file-editor-head {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.file-editor-path {
  font-family: Consolas, 'Courier New', monospace;
  font-size: 13px;
}

.file-editor-head button {
  font: inherit;
  padding: 4px 12px;
  margin-left: 6px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

#btnSaveFile {
  color: var(--white);
  background: var(--accent);
  border-color: var(--accent-dark);
}

#fileEditorText {
  flex: 1 1 auto;
  resize: none;
  padding: 10px;
  font-family: Consolas, 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  border: 1px solid var(--border);
  background: var(--white);
  white-space: pre;
}

@media (max-width: 640px) {
  .sidebar { flex-basis: 140px; }
}