/* ===== Theme Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
}

.theme-toggle .sun-icon {
    display: block;
}

.theme-toggle .moon-icon {
    display: none;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent);
}

/* Home Button */
.home-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.home-btn svg {
    width: 18px;
    height: 18px;
}

.home-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Header controls group */
.header-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-controls .study-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.header-controls .teacher-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}