:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f3f3f3;
    --bg-tertiary: #eeeeee;
    --text-primary: #333333;
    --text-muted: #666666;
    --accent: #007acc;
    --border: #dddddd;
    --terminal-bg: #ffffff;
    --item-hover: #e8e8e8;
    --item-active: #007acc;
    --item-active-text: #ffffff;
}

body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    height: 40px;
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    padding: 0 10px;
    border-bottom: 1px solid var(--border);
    gap: 20px;
}

.logo {
    font-weight: bold;
    color: var(--accent);
    letter-spacing: 1px;
}

.toolbar {
    display: flex;
    gap: 8px;
    align-items: center;
}

button {
    background-color: #ffffff;
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 4px 12px;
    cursor: pointer;
    font-size: 13px;
    border-radius: 4px;
}

button:hover:not(:disabled) {
    background-color: #f0f0f0;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#btn-build, #btn-flash, #btn-connect {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
}

#btn-build:hover:not(:disabled), #btn-flash:hover:not(:disabled), #btn-connect:hover:not(:disabled) {
    background-color: #0062a3;
}

.separator {
    width: 1px;
    height: 20px;
    background-color: var(--border);
    margin: 0 4px;
}

.status {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-muted);
}

main {
    flex: 1;
    display: flex;
    overflow: hidden;
}

#sidebar {
    width: 250px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 8px 12px;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: bold;
}

#file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 4px 0;
}

.file-item {
    padding: 4px 20px;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
}

.file-item:hover {
    background-color: var(--item-hover);
}

.file-item.active {
    background-color: var(--item-active);
    color: var(--item-active-text);
}

.file-item.modified::after {
    content: "●";
    float: right;
    font-size: 10px;
    color: inherit;
    opacity: 0.7;
    margin-left: 10px;
}

#editor-container {
    flex: 1;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-primary);
}

#editor {
    height: 100%;
}

footer {
    height: 200px;
    background-color: var(--terminal-bg);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.terminal-header {
    height: 30px;
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    padding: 0 12px;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    justify-content: space-between;
}

#btn-clear-log {
    background: none;
    border: 1px solid var(--border);
    padding: 2px 6px;
    font-size: 10px;
    color: var(--text-primary);
}

#log {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 12px;
    line-height: 1.4;
    white-space: pre-wrap;
    color: #333333;
    border-top: 1px solid #f0f0f0;
}

.log-info { color: #333333; }
.log-error { color: #d32f2f; font-weight: bold; }
.log-warn { color: #f57c00; }
.log-success { color: #388e3c; font-weight: bold; }

/* CodeMirror overrides */
.cm-editor { height: 100%; }
.cm-gutters { background-color: #f7f7f7 !important; border-right: 1px solid #ddd !important; }