.rn-calc { width: 100%; }
.rn-input {
    width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px;
    font-size: 16px; font-family: var(--font-main); color: var(--text);
    background: var(--white); outline: none; box-sizing: border-box;
}
.rn-input-text { font-family: 'Courier New', monospace; text-transform: uppercase; letter-spacing: 1px; }
.rn-input:focus { border-color: var(--teal); }
.rn-results {
    background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
    overflow: hidden; margin-top: 20px;
}
.rn-result-header { background: #1d4ed8; color: #fff; font-size: 15px; font-weight: 700; padding: 10px 16px; }
.rn-big-output {
    text-align: center; font-size: 28px; font-weight: 800; color: var(--navy);
    padding: 24px 16px; font-family: 'Courier New', monospace; letter-spacing: 1px;
    word-break: break-word;
}
.rn-error-msg { font-size: 13px; color: #dc2626; margin: 10px 0 0; text-align: center; }