/* px / rem / em converter - two base controls, three live-linked value fields, and a
   px-to-rem reference table. Reuses base .btn-outline; colors come from theme tokens only. */

/* Base controls: root font size (rem) and parent font size (em). */
.prem-bases {
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
    padding: 16px; margin-bottom: 24px;
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
}
@media (max-width: 560px) { .prem-bases { grid-template-columns: 1fr; } }

.prem-base { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.prem-hint { margin: 0; font-size: 13px; color: var(--muted); }

/* The three values to convert between. */
.prem-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 560px) { .prem-grid { grid-template-columns: 1fr; } }
.prem-field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }

.prem-label { font-size: 14px; color: var(--muted); font-weight: 600; }

.prem-control { display: flex; align-items: stretch; gap: 8px; }
.prem-control .prem-input { flex: 1; min-width: 0; }
.prem-unit { align-self: center; color: var(--muted); font-weight: 600; font-size: 14px; }

.prem-input {
    width: 100%; box-sizing: border-box; padding: 10px 12px;
    font: inherit; font-size: 16px; color: var(--text);
    background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
    font-variant-numeric: tabular-nums;
}
.prem-input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

/* The px/rem/em result fields read as the centrepiece: bigger, monospace. */
.prem-value {
    font-family: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", monospace;
    font-size: 20px; font-weight: 600; padding: 14px 12px;
    background: var(--surface);
}

.prem-actions { margin: 20px 0 0; }

/* Reference table. */
.prem-reference { margin-top: 32px; }
.prem-reference-title { font-size: 18px; margin: 0 0 12px; }
.prem-reference-base { color: var(--muted); font-weight: 400; font-size: 15px; }

.prem-table {
    border-collapse: collapse; width: 100%; max-width: 360px;
    font-variant-numeric: tabular-nums;
}
.prem-table th, .prem-table td {
    text-align: left; padding: 8px 16px;
    border-bottom: 1px solid var(--border);
}
.prem-table th {
    font-size: 13px; text-transform: uppercase; letter-spacing: .04em;
    color: var(--muted); font-weight: 600;
}
.prem-table td { color: var(--text); }
.prem-table tbody tr:last-child td { border-bottom: 0; }