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

:root {
  --bg: #1e1e1e;
  --panel: #252526;
  --sidebar: #1e1e1e;
  --border: #3c3c3c;
  --text: #d4d4d4;
  --text-muted: #858585;
  --accent: #4CAF50;
  --accent-hover: #43a047;
  --active-file: #094771;
  --hover-bg: #2a2d2e;
  --font: 'JetBrains Mono', 'Fira Code', monospace;
  --topbar-height: 44px;
  --sidebar-width: 220px;
  --font-size: 14px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Top Bar */
#topbar {
  height: var(--topbar-height);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  gap: 16px;
  flex-shrink: 0;
  z-index: 10;
  position: relative;
}

#topbar-title {
  position: absolute;
  left: 16px;
}

#language-controls {
  position: absolute;
  right: 16px;
}

#topbar-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.3px;
}

#run-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 6px 20px;
  border-radius: 4px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
#run-btn:hover:not(:disabled) { background: var(--accent-hover); }
#run-btn:disabled {
  background: #555;
  cursor: not-allowed;
  color: #999;
}

/* Font Size Controls */
#font-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-right: 16px;
}

#language-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

#language-select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font);
  font-size: 12px;
  padding: 4px 8px;
}
.font-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 3px;
  line-height: 1;
  transition: color 0.1s, border-color 0.1s, background 0.1s;
}
.font-btn:hover { color: var(--text); border-color: var(--text-muted); background: var(--hover-bg); }
#font-size-label {
  font-size: 11px;
  color: var(--text-muted);
  min-width: 30px;
  text-align: center;
}

/* Main Area */
#main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Left Pane */
#left-pane {
  width: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  flex-shrink: 0;
}

#file-tree-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#add-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 0 2px;
  border-radius: 3px;
  transition: color 0.1s, background 0.1s;
}
#add-btn:hover { color: var(--text); background: var(--hover-bg); }

#file-tree {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}
#file-tree::-webkit-scrollbar { width: 6px; }
#file-tree::-webkit-scrollbar-track { background: transparent; }
#file-tree::-webkit-scrollbar-thumb { background: #555; border-radius: 3px; }

.tree-item {
  display: flex;
  align-items: center;
  padding: 3px 8px;
  cursor: pointer;
  user-select: none;
  position: relative;
  gap: 4px;
  border-radius: 3px;
  margin: 1px 4px;
  color: var(--text);
}
.tree-item:hover { background: var(--hover-bg); }
.tree-item.active { background: var(--active-file); }

.tree-item .item-icon {
  flex-shrink: 0;
  font-size: 13px;
  width: 16px;
  text-align: center;
}
.tree-item .item-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--font-size);
}
.tree-item .delete-btn {
  display: none;
  background: none;
  border: none;
  color: #e06c75;
  cursor: pointer;
  font-size: 14px;
  padding: 0 2px;
  border-radius: 3px;
  line-height: 1;
  flex-shrink: 0;
}
.tree-item:hover .delete-btn { display: block; }
.tree-item .delete-btn:hover { background: rgba(224,108,117,0.15); }

/* Editor Area */
#editor-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

#breadcrumb {
  padding: 6px 14px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#breadcrumb span { color: var(--text); }

#editor-wrapper {
  flex: 1;
  overflow: hidden;
  position: relative;
}
#editor-wrapper .CodeMirror {
  height: 100%;
  font-family: var(--font);
  font-size: var(--font-size);
  line-height: 1.6;
}
#no-file-msg {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-size: 14px;
}

/* Right Pane (Console) */
#right-pane {
  width: 380px;
  min-width: 150px;
  max-width: 70%;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-left: 1px solid var(--border);
  flex-shrink: 0;
}

/* Console Resize Handle */
#console-resizer {
  width: 5px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.15s;
}
#console-resizer:hover,
#console-resizer.dragging { background: var(--accent); }

#console-header {
  padding: 8px 14px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#console-output {
  flex: 1;
  overflow-y: auto;
  padding: 10px 14px;
  font-family: var(--font);
  font-size: var(--font-size);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
#console-output::-webkit-scrollbar { width: 6px; }
#console-output::-webkit-scrollbar-track { background: transparent; }
#console-output::-webkit-scrollbar-thumb { background: #555; border-radius: 3px; }

.out-stdout { color: #d4d4d4; }
.out-stderr  { color: #e06c75; }
.out-system  { color: #858585; font-style: italic; }

#console-footer {
  padding: 8px 12px;
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  text-align: center;
  flex-shrink: 0;
  background: var(--panel);
}

#console-footer a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}

#console-footer a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Modal */
#modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
#modal-overlay.visible { display: flex; }

#modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  min-width: 320px;
  max-width: 90vw;
}
#modal h2 {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 16px;
  color: var(--text);
}
#modal label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
#modal input[type="text"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  padding: 7px 10px;
  outline: none;
  margin-bottom: 16px;
}
#modal input[type="text"]:focus { border-color: var(--accent); }

#modal-type-row {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}
.type-btn {
  flex: 1;
  padding: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.1s, background 0.1s;
}
.type-btn.selected {
  border-color: var(--accent);
  background: rgba(76,175,80,0.12);
  color: var(--accent);
}

#modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}
.modal-btn {
  padding: 7px 18px;
  border-radius: 4px;
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
  border: none;
}
#modal-cancel { background: var(--hover-bg); color: var(--text); }
#modal-cancel:hover { background: #3a3a3a; }
#modal-create { background: var(--accent); color: #fff; }
#modal-create:hover { background: var(--accent-hover); }