[data-theme="dark"] {
    --bg-body: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.85);
    --bg-glass: rgba(30, 41, 59, 0.7);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
}

[data-theme="dark"] .navbar-glass { background: rgba(15, 23, 42, 0.85); }
[data-theme="dark"] .navbar-toggler-icon { filter: invert(1); }
[data-theme="dark"] .site-footer { background: #020617; }
[data-theme="dark"] .accordion-button { color: var(--text-primary); }
[data-theme="dark"] .accordion-button::after { filter: invert(1); }
[data-theme="dark"] .form-control { background: rgba(15, 23, 42, 0.5); color: var(--text-primary); border-color: var(--border-color); }
[data-theme="dark"] .input-group-text { background: rgba(15, 23, 42, 0.5) !important; color: var(--text-muted); border-color: var(--border-color); }
[data-theme="dark"] .format-card { background: rgba(15, 23, 42, 0.5); }
[data-theme="dark"] .modal-content { background: var(--bg-card); color: var(--text-primary); }
[data-theme="dark"] .btn-close { filter: invert(1); }
[data-theme="dark"] .alert-danger { background: rgba(239, 68, 68, 0.15); border-color: rgba(239, 68, 68, 0.3); color: #fca5a5; }
[data-theme="dark"] .navbar-collapse {
    background: rgba(15, 23, 42, 0.98);
}

[data-theme="dark"] .navbar-nav .dropdown-menu {
    background: rgba(15, 23, 42, 0.98);
}