body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    margin-bottom: 20px;
    border-bottom: 2px solid #007acc;
    padding-bottom: 10px;
}

.main-content {
    display: flex;
    gap: 20px;
}

.editor-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.status-section {
    flex: 1.4;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

#code-editor {
    width: 100%;
    height: 400px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
    background-color: #1e1e1e;
    color: #d4d4d4;
}

.controls {
    margin-top: 10px;
    display: flex;
    gap: 10px;
}

button {
    padding: 8px 16px;
    background-color: #007acc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

button:hover {
    background-color: #005fa3;
}

button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.error {
    color: red;
    margin-top: 10px;
    font-weight: bold;
    min-height: 20px;
}

.registers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 20px;
    font-family: 'Consolas', monospace;
}

.reg {
    background-color: #f5f5f5;
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.fifos {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.fifo-box {
    flex: 1;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 4px;
}

.fifo-box ul {
    list-style: none;
    padding: 0;
    margin: 10px 0 0 0;
    max-height: 100px;
    overflow-y: auto;
    font-family: 'Consolas', monospace;
}

.fifo-box li {
    background-color: #eef;
    margin-bottom: 2px;
    padding: 2px 5px;
}

#timing-chart {
    border: 1px solid #ccc;
    background-color: #fff;
    width: 100%;
    margin-top: 10px;
}

.control-panel {
    background-color: #f9f9f9;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}

.pin-config {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.config-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9em;
}

.config-item label {
    white-space: nowrap;
}

.config-item input:not([type="checkbox"]) {
    width: 60px;
    padding: 2px;
}

.config-item select {
    width: auto;
    padding: 2px;
}

.config-item input[type="checkbox"] {
    margin: 0;
}

.pin-output {
    margin-bottom: 20px;
}

.hex-display {
    font-family: 'Consolas', monospace;
    font-size: 16px;
    margin-bottom: 5px;
    font-weight: bold;
}

.gpio-indicators {
    display: flex;
    flex-wrap: wrap;
    column-gap: 2px;
    row-gap: 5px;
    max-width: 460px;
}

.gpio-bit {
    box-sizing: border-box;
    width: calc((100% - 44px) / 16);
    aspect-ratio: 1;
    border: 1px solid #999;
    background-color: #eee;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
    color: #666;
    cursor: pointer;
    user-select: none;
}

.gpio-bit.on {
    background-color: #4caf50;
    color: white;
    border-color: #2e7d32;
}

.gpio-bit.input {
    border-style: dashed;
    border-color: #2196f3;
    background-color: #e3f2fd;
    color: #333;
}

.gpio-bit.input.on {
    background-color: #2196f3;
    color: white;
    border-color: #1565c0;
}

.gpio-bit:nth-child(8n) {
    margin-right: 10px;
}

.gpio-bit:nth-child(16n) {
    margin-right: 0;
}

.irq-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.irq-flags {
    display: flex;
    gap: 10px;
}

.irq-flag {
    padding: 5px 10px;
    background-color: #eee;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.irq-flag:hover {
    background-color: #e0e0e0;
}

.irq-flag.active {
    background-color: #ff9800; /* Orange */
    color: white;
    border-color: #f57c00;
}

.program-display {
    margin-top: 10px;
    background-color: #1e1e1e;
    color: #d4d4d4;
    padding: 10px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    max-height: 300px;
    overflow-y: auto;
    display: none;
}

.program-line {
    padding: 2px 5px;
    white-space: pre;
}

.program-line.active {
    background-color: #264f78;
    color: #fff;
}

.program-line .pc {
    color: #858585;
    margin-right: 15px;
    display: inline-block;
    width: 25px;
    text-align: right;
    user-select: none;
}

#timing-pin-selector .gpio-bit {
    cursor: pointer;
}

#timing-pin-selector .gpio-bit.selected {
    background-color: #2196f3;
    color: white;
    border-color: #1976d2;
}