/* --- Theme Variables --- */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-hover: #253349;
    --bg-input: #0f172a;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --error-bg: #7f1d1d;
    --error-text: #fca5a5;
    --delete-border: #7f1d1d;
    --delete-text: #fca5a5;
}

html.light {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-hover: #f1f5f9;
    --bg-input: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --error-bg: #fef2f2;
    --error-text: #991b1b;
    --delete-border: #fca5a5;
    --delete-text: #dc2626;
}

/* --- Theme Toggle Button --- */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.2s;
}
.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: inline; }
html.light .theme-toggle .sun { display: inline; }
html.light .theme-toggle .moon { display: none; }