.mode-toggle-btn {
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px 8px 8px;
    background: rgba(20, 9, 9, 0.65);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--color-glass-border);
    border-radius: 999px;
    cursor: pointer;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), transform 0.2s var(--ease);
}

.mode-toggle-btn:hover {
    border-color: rgba(254, 214, 214, 0.3);
    color: var(--color-text);
    transform: translateY(-1px);
}

.mode-toggle-btn:active {
    transform: translateY(0);
}

.mode-toggle-icon {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
}

/* Knob position: right in normal/animated mode, left in legacy mode */
.mode-toggle-icon .mode-icon-knob {
    transition: transform 0.3s var(--ease);
    transform: translateX(0);
}

body[data-mode="legacy"] .mode-toggle-icon .mode-icon-knob {
    transform: translateX(-9px);
}

/* Gradient fill and sparkle only show in normal/animated mode */
.mode-toggle-icon .mode-icon-fill,
.mode-toggle-icon .mode-icon-sparkle {
    transition: opacity 0.3s var(--ease);
    opacity: 1;
}

body[data-mode="legacy"] .mode-toggle-icon .mode-icon-fill,
body[data-mode="legacy"] .mode-toggle-icon .mode-icon-sparkle {
    opacity: 0;
}

.mode-toggle-label::after {
    content: "Legacy mode";
}

body[data-mode="legacy"] .mode-toggle-label::after {
    content: "Normal mode";
}

@media (max-width: 640px) {
    .mode-toggle-label {
        display: none;
    }
    .mode-toggle-btn {
        padding: 8px;
    }
}

/* ============================================================
   Legacy mode: strips animation and heavy visual effects while
   keeping every page fully functional. Applied via body[data-mode].
   ============================================================ */

body[data-mode="legacy"] .bg-scene {
    display: none;
}

body[data-mode="legacy"] {
    background: #0a0505;
}

body[data-mode="legacy"] * ,
body[data-mode="legacy"] *::before,
body[data-mode="legacy"] *::after {
    animation: none !important;
    transition: none !important;
}

body[data-mode="legacy"] .glass-panel,
body[data-mode="legacy"] .repo-card,
body[data-mode="legacy"] .feature-card,
body[data-mode="legacy"] .code-window,
body[data-mode="legacy"] .auth-card,
body[data-mode="legacy"] .stat-box,
body[data-mode="legacy"] .navbar,
body[data-mode="legacy"] .settings-panel,
body[data-mode="legacy"] .docs-section {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: #150808;
}

body[data-mode="legacy"] .navbar {
    background: #0f0606;
}

body[data-mode="legacy"] .hero-title {
    background: none;
    -webkit-text-fill-color: initial;
    color: #ffffff;
}

body[data-mode="legacy"] .repo-card:hover,
body[data-mode="legacy"] .feature-card:hover {
    transform: none;
}

body[data-mode="legacy"] .code-window-cursor {
    opacity: 1;
}