.change-theme-btn {
    padding: 10px 18px;
    background: rgba(255, 215, 0, 0.15);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    cursor: pointer;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    min-height: 44px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
    transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease, transform 0.35s ease;
}

.change-theme-btn:hover,
.change-theme-btn:focus {
    background: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-1px) scale(1.04);
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.18);
    outline: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 600;
    opacity: 0.9;
    transition: opacity 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
    opacity: 1;
}

.desktop-nav,
.mobile-menu {
    transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.text-muted {
    color: var(--text-muted);
}

.muted-link {
    color: var(--text-secondary);
}