:root {
    /* NEXUS (Default - Cyberpunk Dark) */
    --bg-rgb: 15, 20, 25;
    /* #0f1419 */
    --surface-rgb: 26, 31, 46;
    /* #1a1f2e */
    --card-rgb: 36, 43, 61;
    /* #242b3d */
    --border-rgb: 45, 53, 72;
    /* #2d3548 */
    --hover-rgb: 42, 50, 68;
    /* #2a3244 approx */

    --text-main: #ffffff;
    --text-muted: #9ca3af;
    --accent-rgb: 99, 102, 241;
    /* #6366f1 */
}

[data-theme="grimoire"] {
    /* GRIMOIRE (Fantasy / Paper) */
    --bg-rgb: 28, 25, 23;
    /* #1c1917 */
    --surface-rgb: 41, 37, 36;
    /* #292524 */
    --card-rgb: 68, 64, 60;
    /* #44403c */
    --border-rgb: 87, 83, 78;
    /* #57534e */
    --hover-rgb: 87, 83, 78;

    --text-main: #e7e5e4;
    --text-muted: #a8a29e;
    --accent-rgb: 217, 119, 6;
    /* #d97706 */
}

[data-theme="matrix"] {
    /* MATRIX (Hacker / Terminal) */
    --bg-rgb: 0, 0, 0;
    --surface-rgb: 5, 10, 5;
    --card-rgb: 10, 20, 10;
    --border-rgb: 0, 51, 0;
    /* #003300 */
    --hover-rgb: 0, 34, 0;

    --text-main: #00ff41;
    --text-muted: #33ff66;
    /* Brightened for readability against black */
    --accent-rgb: 0, 255, 65;
}

/* Base definitions */
body {
    background-color: rgb(var(--bg-rgb));
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    /* Enforce readable font */
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Transitions */
.theme-transition,
.theme-transition * {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}