.riscv-assembler {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.riscv-assembler body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    padding: 20px;
    background-color: #f5f5f5;
}

.riscv-assembler .container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.riscv-assembler h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.riscv-assembler .header-row {
    display: grid;
    grid-template-columns: 80px repeat(5, 150px);
    gap: 10px;
    margin-bottom: 20px;
    padding-left: 0;
    position: relative;
    align-items: center;
    height: 40px;
}

.riscv-assembler .field-container {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: relative;
    width: 100%;
    align-items: center;
    justify-content: center;
    height: 40px;
}

.riscv-assembler .field-label {
    font-size: 12px;
    color: #666;
    width: 100%;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    white-space: nowrap;
    text-align: center;
    line-height: 1.2;
}

.riscv-assembler .instruction-row {
    display: grid;
    grid-template-columns: 80px repeat(5, 150px);
    gap: 10px;
    margin-bottom: 5px;
    align-items: center;
    position: relative;
    height: 40px;
    padding-top: 0;
}

.riscv-assembler .address-header {
    font-size: 12px;
    color: #666;
    width: 70px;
    text-align: center;
    padding-right: 10px;
    white-space: nowrap;
    line-height: 1.2;
    margin-bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 40px;
}

.riscv-assembler .address-label {
    font-family: monospace;
    color: #000;
    width: 70px;
    text-align: center;
    padding-right: 10px;
    line-height: 1.2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.riscv-assembler select,
.riscv-assembler input {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    width: 100%;
    text-align: center;
    text-align-last: center;
}

.riscv-assembler select {
    min-width: 150px;
}

.riscv-assembler input {
    width: 150px;
}

.riscv-assembler select option {
    text-align: center;
}

.riscv-assembler button {
    padding: 8px 16px;
    background-color: #000;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin: 10px 5px;
    font-size: 14px;
}

.riscv-assembler button:hover {
    background-color: #333;
}

.riscv-assembler .output {
    margin-top: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 4px;
}

.riscv-assembler .output h2 {
    margin-bottom: 15px;
    color: #333;
}

.riscv-assembler .output-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.riscv-assembler pre {
    background-color: #fff;
    padding: 15px;
    border-radius: 4px;
    border: 1px solid #ddd;
    overflow-x: auto;
    font-family: monospace;
}

.riscv-assembler select:disabled,
.riscv-assembler input:disabled {
    background-color: #f5f5f5;
    color: #999;
    cursor: not-allowed;
    opacity: 0.5;
}

.riscv-assembler #instruction-rows {
    padding-left: 0;
    margin-top: 10px;
}